Menu
▾
▴
jsbsim-devel — JSBSim development issues
You can subscribe to this list here.
| 2001 |
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sep
|
Oct
(48) |
Nov
(131) |
Dec
(213) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2002 |
Jan
(92) |
Feb
(91) |
Mar
(67) |
Apr
(61) |
May
(27) |
Jun
(26) |
Jul
(55) |
Aug
(61) |
Sep
(165) |
Oct
(20) |
Nov
(51) |
Dec
(36) |
| 2003 |
Jan
(70) |
Feb
(126) |
Mar
(120) |
Apr
(39) |
May
(31) |
Jun
(72) |
Jul
(193) |
Aug
(5) |
Sep
(82) |
Oct
(92) |
Nov
(287) |
Dec
(113) |
| 2004 |
Jan
(139) |
Feb
(296) |
Mar
(201) |
Apr
(276) |
May
(145) |
Jun
(198) |
Jul
(56) |
Aug
(84) |
Sep
(139) |
Oct
(134) |
Nov
(189) |
Dec
(168) |
| 2005 |
Jan
(146) |
Feb
(118) |
Mar
(99) |
Apr
(55) |
May
(119) |
Jun
(167) |
Jul
(77) |
Aug
(65) |
Sep
(89) |
Oct
(21) |
Nov
(71) |
Dec
(193) |
| 2006 |
Jan
(204) |
Feb
(141) |
Mar
(90) |
Apr
(60) |
May
(87) |
Jun
(75) |
Jul
(62) |
Aug
(68) |
Sep
(61) |
Oct
(96) |
Nov
(65) |
Dec
(30) |
| 2007 |
Jan
(104) |
Feb
(31) |
Mar
(45) |
Apr
(101) |
May
(74) |
Jun
(84) |
Jul
(40) |
Aug
(134) |
Sep
(126) |
Oct
(100) |
Nov
(51) |
Dec
(81) |
| 2008 |
Jan
(184) |
Feb
(80) |
Mar
(100) |
Apr
(134) |
May
(195) |
Jun
(88) |
Jul
(85) |
Aug
(81) |
Sep
(31) |
Oct
(92) |
Nov
(105) |
Dec
(62) |
| 2009 |
Jan
(75) |
Feb
(64) |
Mar
(96) |
Apr
(93) |
May
(125) |
Jun
(123) |
Jul
(114) |
Aug
(161) |
Sep
(114) |
Oct
(177) |
Nov
(97) |
Dec
(27) |
| 2010 |
Jan
(89) |
Feb
(72) |
Mar
(172) |
Apr
(137) |
May
(45) |
Jun
(42) |
Jul
(206) |
Aug
(181) |
Sep
(152) |
Oct
(108) |
Nov
(113) |
Dec
(150) |
| 2011 |
Jan
(111) |
Feb
(200) |
Mar
(101) |
Apr
(119) |
May
(232) |
Jun
(182) |
Jul
(243) |
Aug
(80) |
Sep
(77) |
Oct
(141) |
Nov
(50) |
Dec
(36) |
| 2012 |
Jan
(60) |
Feb
(17) |
Mar
(87) |
Apr
(41) |
May
(32) |
Jun
(18) |
Jul
(35) |
Aug
(45) |
Sep
(71) |
Oct
(61) |
Nov
(43) |
Dec
(64) |
| 2013 |
Jan
(114) |
Feb
(26) |
Mar
(55) |
Apr
(24) |
May
(4) |
Jun
(27) |
Jul
(4) |
Aug
(21) |
Sep
(99) |
Oct
(11) |
Nov
(47) |
Dec
(11) |
| 2014 |
Jan
(131) |
Feb
(18) |
Mar
(4) |
Apr
(1) |
May
(24) |
Jun
(22) |
Jul
(14) |
Aug
(49) |
Sep
(13) |
Oct
(32) |
Nov
(52) |
Dec
(67) |
| 2015 |
Jan
(48) |
Feb
(63) |
Mar
(21) |
Apr
(83) |
May
(26) |
Jun
(6) |
Jul
(18) |
Aug
(29) |
Sep
(30) |
Oct
(89) |
Nov
(36) |
Dec
(50) |
| 2016 |
Jan
(42) |
Feb
(34) |
Mar
(12) |
Apr
(5) |
May
(54) |
Jun
(2) |
Jul
(10) |
Aug
(55) |
Sep
(53) |
Oct
(40) |
Nov
(12) |
Dec
|
| 2017 |
Jan
(31) |
Feb
(11) |
Mar
(7) |
Apr
(12) |
May
(4) |
Jun
|
Jul
|
Aug
(1) |
Sep
(5) |
Oct
(7) |
Nov
(1) |
Dec
(19) |
| 2018 |
Jan
(3) |
Feb
(4) |
Mar
(49) |
Apr
(133) |
May
(185) |
Jun
(5) |
Jul
(5) |
Aug
(1) |
Sep
(2) |
Oct
(22) |
Nov
(6) |
Dec
|
| 2019 |
Jan
(4) |
Feb
|
Mar
(3) |
Apr
(9) |
May
(5) |
Jun
|
Jul
|
Aug
(6) |
Sep
(7) |
Oct
|
Nov
|
Dec
(3) |
| 2020 |
Jan
(1) |
Feb
|
Mar
|
Apr
(14) |
May
|
Jun
|
Jul
|
Aug
|
Sep
|
Oct
(20) |
Nov
(8) |
Dec
(4) |
| 2021 |
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sep
(6) |
Oct
|
Nov
|
Dec
|
|
From: Sean M. <se...@se...> - 2021-09-21 08:24:23
|
Hi Soroush I'd suggest posting in the Discussions section of the JSBSim repo hosted at github, it's a lot more active than the mailing list. https://github.com/JSBSim-Team/jsbsim Cheers From: Karimi, Soroush <so...@ut...> Sent: Monday, September 20, 2021 11:53 PM To: jsb...@li... Subject: [Jsbsim-devel] Roadmap & Collaboration Hi, I hope you are all having a good day. I'm Soroush Karimi and a PhD student at the university of Tulsa. We are a team of researchers doing research on aircraft control systems and ground collision avoidance systems. We are using JSBSIM in python to create our simulations. Thank you so much for all the effort you've put into JSBSIM, It is really astonishing. We are trying to develop models on top of JSBSIM and share it so other researchers can also benefit from our work. I would really appreciate your feedback on the topics below so we can get a clearer view of our next steps. 1. Are there any current developments/upgrades to JSBSIM or any roadmaps for future development available? 2. How can we collaborate on the project? In terms of adding new features, documentation or sample codes? 3. Do you need help in any specific criteria in JSBSIM? Thanks in advance for your time. Regards, Soroush Karimi |
|
From: Erik H. <er...@eh...> - 2021-09-21 06:45:53
|
On 9/21/21 8:43 AM, Erik Hofman wrote: > Of course this will never reach the accuracy of DATCOM+ but depending > on your requirements it might be good enough. At least for a start: > https://github.com/JSBSim-Team/aeromatic Wrong URL, that one is from the predecessor of AeromatiC++ https://github.com/JSBSim-Team/jsbsim/tree/master/utils/aeromatic%2B%2B -- http://www.adalin.com High performance audio scenegraph and sound simulation. |
|
From: Erik H. <er...@eh...> - 2021-09-21 06:44:17
|
Hi, On 9/20/21 11:53 PM, Karimi, Soroush wrote: > Hi, > > I hope you are all having a good day. I’m Soroush Karimi and a PhD > student at the university of Tulsa. We are a team of researchers doing > research on aircraft control systems and ground collision avoidance > systems. We are using JSBSIM in python to create our simulations. Thank > you so much for all the effort you’ve put into JSBSIM, It is really > astonishing. > > We are trying to develop models on top of JSBSIM and share it so other > researchers can also benefit from our work. I would really appreciate > your feedback on the topics below so we can get a clearer view of our > next steps. > > 1. Are there any current developments/upgrades to JSBSIM or any > roadmaps for future development available? > 2. How can we collaborate on the project? In terms of adding new > features, documentation or sample codes? > 3. Do you need help in any specific criteria in JSBSIM? Most of the development, including discussions, take place at githib these days: https://github.com/JSBSim-Team It would not have been my first choice but what can you do. In addition to what Bill described (DATCOM+ which is a really powerful tool) there is also AeromatiC++ which is a small command-line tool to create JSBSim configuration files from a small set of parameters. Of course this will never reach the accuracy of DATCOM+ but depending on your requirements it might be good enough. At least for a start: https://github.com/JSBSim-Team/aeromatic Erik -- http://www.adalin.com High performance audio scenegraph and sound simulation. |
|
From: David C. <dp...@gm...> - 2021-09-21 03:14:54
|
Hello Soroush, Welcome. I can't think of anything at the moment. Please ask if you have any questions about JSBSim. Cheers, Dave Culp On Mon, Sep 20, 2021 at 5:27 PM Karimi, Soroush <so...@ut...> wrote: > Hi, > > > > I hope you are all having a good day. I’m Soroush Karimi and a PhD student > at the university of Tulsa. We are a team of researchers doing research on > aircraft control systems and ground collision avoidance systems. We are > using JSBSIM in python to create our simulations. Thank you so much for all > the effort you’ve put into JSBSIM, It is really astonishing. > > We are trying to develop models on top of JSBSIM and share it so other > researchers can also benefit from our work. I would really appreciate your > feedback on the topics below so we can get a clearer view of our next steps. > > 1. Are there any current developments/upgrades to JSBSIM or any > roadmaps for future development available? > 2. How can we collaborate on the project? In terms of adding new > features, documentation or sample codes? > 3. Do you need help in any specific criteria in JSBSIM? > > Thanks in advance for your time. > > > > Regards, > > Soroush Karimi > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: Bill G. <bil...@gm...> - 2021-09-21 01:04:07
|
Soroush, Allow me to fire off the first shot, although I'm sure the team of experts are typing stuff out as this hits the wire. I champion the Airplane Datcom program. I got a copy of the source in 1996, and have added a lot to the front and end back end to make it more user friendly, while keeping the same basic core model. With it, I've been able to build an airplane model in around 4 hours, and get it flying flight test maneuvers in 30 minutes or so. Of course, I'm an expert, so your first few models might take a little longer. However, if you are looking for some breadth in your research, it's a great tool. I've found it to be about 90% or more accurate for conventional aircraft in conventional flight. You can find out more at www.holycows.net/Datcom <http://www.holycows.net/Datcom> . A few years ago, I was asked to propose a solution for an Air Traffic Controller program. The target area was Charles de Gaulle Airport in France, and the surrounding area. They needed up to 200 different aircraft that could takeoff, depart the pattern and the area, and/or fly in from other areas, enter the pattern and land, all while being controlled by ATC to do simple maneuvers (Turn to head, descend/Climb, etc.). Datcom and JSBSim were the perfect answer for their need. I proposed building several models in different classes of aircraft, and allow their engineers to populate the entire 200 aircraft from those basic models. They decided not to use my approach, or at least not use me to do it. Don't know what they did, but wouldn't be surprised if they stole my ideas. Anywho, the major portion of that work was to come up with a tunable generic autopilot within the scripting language of JSBSim. The functions are all the same, just the gains are different. I've done work with the scripting language, and while it was powerful, it could use some extensions. I've been out of that arena for a while, so don't know if these type changes have been made, but having functions and subroutines that can be called would be great, in order to build the scripting language into a higher order language. Then you would need to generate a generic autopilot for what you need it to do (heading hold, point-to-point navigation, flying routes, take-offs, landings, etc.) Just a slight suggestion. I don't mean to offend you if this is too simple. It might seem extremely obvious, but so people make things harder than necessary sometimes. Start off with flat ground until you get everything ironed out and you have something working well. Then you can apply an irregular Earth, starting off with simple hills and valley, working your way up to canyons with sharp drop-offs and rises. Flying into Durango and some of the other airports in Colorado offers a lot of challenges, like navigating through a valley while hopefully avoiding any of the brown stuff. Some people want to jump into the hardest part first, and never recover. Best of luck with your research, Bill From: Karimi, Soroush [mailto:so...@ut...] Sent: Monday, September 20, 2021 5:53 PM To: jsb...@li... Subject: [Jsbsim-devel] Roadmap & Collaboration Hi, I hope you are all having a good day. I'm Soroush Karimi and a PhD student at the university of Tulsa. We are a team of researchers doing research on aircraft control systems and ground collision avoidance systems. We are using JSBSIM in python to create our simulations. Thank you so much for all the effort you've put into JSBSIM, It is really astonishing. We are trying to develop models on top of JSBSIM and share it so other researchers can also benefit from our work. I would really appreciate your feedback on the topics below so we can get a clearer view of our next steps. 1) Are there any current developments/upgrades to JSBSIM or any roadmaps for future development available? 2) How can we collaborate on the project? In terms of adding new features, documentation or sample codes? 3) Do you need help in any specific criteria in JSBSIM? Thanks in advance for your time. Regards, Soroush Karimi <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient> Virus-free. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient> www.avg.com |
|
From: Karimi, S. <so...@ut...> - 2021-09-21 00:27:09
|
Hi, I hope you are all having a good day. I’m Soroush Karimi and a PhD student at the university of Tulsa. We are a team of researchers doing research on aircraft control systems and ground collision avoidance systems. We are using JSBSIM in python to create our simulations. Thank you so much for all the effort you’ve put into JSBSIM, It is really astonishing. We are trying to develop models on top of JSBSIM and share it so other researchers can also benefit from our work. I would really appreciate your feedback on the topics below so we can get a clearer view of our next steps. 1. Are there any current developments/upgrades to JSBSIM or any roadmaps for future development available? 2. How can we collaborate on the project? In terms of adding new features, documentation or sample codes? 3. Do you need help in any specific criteria in JSBSIM? Thanks in advance for your time. Regards, Soroush Karimi |
|
From: Simon J. M. <sim...@go...> - 2020-12-18 12:47:33
|
Can someone look into this and confirm that my observations are correct ? The loss of fuel in a tank changes the inertia values of the plane. However removing or moving the location of a pointweight does not do this. I would like it to do so, so as when troops are dropped from a helicopter or munitions are used the inertia values for the aircraft reflects this. regards Simon |
|
From: Sean M. <se...@se...> - 2020-12-14 10:08:13
|
Hi Fyi Bertrand enabled the recently released Github discussions feature for the JSBSim Github repo. "You are welcome to participate and add material to the forum/Discussions. >From my point of view, the idea would be stopping using Issues from now on for general questions and support requests and rather start using Discussions instead for such topics. From that perspective, Issues would be limited to bug reports and feature requests. Any other topic should go to Discussions." https://github.com/JSBSim-Team/jsbsim/discussions https://github.com/JSBSim-Team/jsbsim/issues Cheers |
|
From: David C. <dp...@gm...> - 2020-12-13 19:59:33
|
If I recall correctly there is a property called wind-from-down. Give this a positive value to simulate a thermal. On Sun, Dec 13, 2020, 4:45 AM Simon Julie Morley via Jsbsim-devel < jsb...@li...> wrote: > Hi guys > > Merry Christmas, > > I'm looking to implement thermals and ridge lift in Outerra. Have you guys > got any advice on how I should go about this ? > > regards > > Simon > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: Simon J. M. <sim...@go...> - 2020-12-13 12:44:55
|
Hi guys Merry Christmas, I'm looking to implement thermals and ridge lift in Outerra. Have you guys got any advice on how I should go about this ? regards Simon |
|
From: Simon J. M. <sim...@go...> - 2020-11-14 22:40:43
|
Surely mode can only be determined based on whether the vehicle is on the ground or not ? On Sat, 14 Nov 2020, 21:01 GNU, <uri...@gm...> wrote: > This ground trim initialization does not consistently work in Outerra > unfortunately. This is no fault of either OT or JSB, but it has not been > properly implemented in the engine. > > On Sat, Nov 14, 2020 at 1:24 PM dave <dav...@co...> wrote: > >> That depends on how JSBSim is incorporated into Outerra. The >> initialization process is described on page 80 of the reference manual: >> http://jsbsim.sourceforge.net/JSBSimReferenceManual.pdf >> >> Note the line: FDMExec->DoTrim(mode); >> >> For ground trim set mode=1 >> >> >> Note: The documentation in the source code conflicts, but I believe 1 is >> the correct value for ground trimming. >> >> (FGInitialCondition.h lines 168,169 conflicts with FGFDMExec.h lines >> 432-440) >> >> >> >> Dave >> >> >> On 11/14/20 2:32 AM, Simon Julie Morley via Jsbsim-devel wrote: >> >> how do I specify ground trim ? >> >> On Sat, 14 Nov 2020 at 00:51, David Culp <dp...@gm...> wrote: >> >>> Make sure you use ground trim rather than in-air trim. I'm assuming you >>> start off on the ground. >>> >>> Dave >>> >>> On Fri, Nov 13, 2020, 2:38 PM Simon Julie Morley via Jsbsim-devel < >>> jsb...@li...> wrote: >>> >>>> When spawning in Outerra the turbine is rotating. >>>> >>>> We can initialise with the fuel cutoff to 1 but this seems to be after >>>> the fact that the engine was running,so it's on the slow down, from 6000 >>>> rpms that's quite a long slow down >>>> >>>> Is there a way to spawn without the engine having ever started ? >>>> >>>> regards >>>> >>>> Simon >>>> _______________________________________________ >>>> Jsbsim-devel mailing list >>>> Jsb...@li... >>>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >>>> _______________________________________________ >>>> The JSBSim Flight Dynamics Model project >>>> http://www.JSBSim.org >>>> _______________________________________________ >>>> >>>> _______________________________________________ >>> Jsbsim-devel mailing list >>> Jsb...@li... >>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >>> _______________________________________________ >>> The JSBSim Flight Dynamics Model project >>> http://www.JSBSim.org >>> _______________________________________________ >>> >>> >> >> _______________________________________________ >> Jsbsim-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model projecthttp://www.JSBSim.org >> _______________________________________________ >> >> >> _______________________________________________ >> Jsbsim-devel mailing list >> Jsb...@li... >> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model project >> http://www.JSBSim.org >> _______________________________________________ >> >> _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: GNU <uri...@gm...> - 2020-11-14 21:01:45
|
This ground trim initialization does not consistently work in Outerra unfortunately. This is no fault of either OT or JSB, but it has not been properly implemented in the engine. On Sat, Nov 14, 2020 at 1:24 PM dave <dav...@co...> wrote: > That depends on how JSBSim is incorporated into Outerra. The > initialization process is described on page 80 of the reference manual: > http://jsbsim.sourceforge.net/JSBSimReferenceManual.pdf > > Note the line: FDMExec->DoTrim(mode); > > For ground trim set mode=1 > > > Note: The documentation in the source code conflicts, but I believe 1 is > the correct value for ground trimming. > > (FGInitialCondition.h lines 168,169 conflicts with FGFDMExec.h lines > 432-440) > > > > Dave > > > On 11/14/20 2:32 AM, Simon Julie Morley via Jsbsim-devel wrote: > > how do I specify ground trim ? > > On Sat, 14 Nov 2020 at 00:51, David Culp <dp...@gm...> wrote: > >> Make sure you use ground trim rather than in-air trim. I'm assuming you >> start off on the ground. >> >> Dave >> >> On Fri, Nov 13, 2020, 2:38 PM Simon Julie Morley via Jsbsim-devel < >> jsb...@li...> wrote: >> >>> When spawning in Outerra the turbine is rotating. >>> >>> We can initialise with the fuel cutoff to 1 but this seems to be after >>> the fact that the engine was running,so it's on the slow down, from 6000 >>> rpms that's quite a long slow down >>> >>> Is there a way to spawn without the engine having ever started ? >>> >>> regards >>> >>> Simon >>> _______________________________________________ >>> Jsbsim-devel mailing list >>> Jsb...@li... >>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >>> _______________________________________________ >>> The JSBSim Flight Dynamics Model project >>> http://www.JSBSim.org >>> _______________________________________________ >>> >>> _______________________________________________ >> Jsbsim-devel mailing list >> Jsb...@li... >> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model project >> http://www.JSBSim.org >> _______________________________________________ >> >> > > _______________________________________________ > Jsbsim-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model projecthttp://www.JSBSim.org > _______________________________________________ > > > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: dave <dav...@co...> - 2020-11-14 18:10:43
|
That depends on how JSBSim is incorporated into Outerra. The initialization process is described on page 80 of the reference manual: http://jsbsim.sourceforge.net/JSBSimReferenceManual.pdf Note the line: FDMExec->DoTrim(mode); For ground trim set mode=1 Note: The documentation in the source code conflicts, but I believe 1 is the correct value for ground trimming. (FGInitialCondition.h lines 168,169 conflicts with FGFDMExec.h lines 432-440) Dave On 11/14/20 2:32 AM, Simon Julie Morley via Jsbsim-devel wrote: > how do I specify ground trim ? > > On Sat, 14 Nov 2020 at 00:51, David Culp <dp...@gm... > <mailto:dp...@gm...>> wrote: > > Make sure you use ground trim rather than in-air trim. I'm > assuming you start off on the ground. > > Dave > > On Fri, Nov 13, 2020, 2:38 PM Simon Julie Morley via Jsbsim-devel > <jsb...@li... > <mailto:jsb...@li...>> wrote: > > When spawning in Outerra the turbine is rotating. > > We can initialise with the fuel cutoff to 1 but this seems to > be after the fact that the engine was running,so it's on the > slow down, from 6000 rpms that's quite a long slow down > > Is there a way to spawn without the engine having ever started ? > > regards > > Simon > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > <mailto:Jsb...@li...> > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > <mailto:Jsb...@li...> > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > > > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > |
|
From: Simon J. M. <sim...@go...> - 2020-11-14 10:32:32
|
how do I specify ground trim ? On Sat, 14 Nov 2020 at 00:51, David Culp <dp...@gm...> wrote: > Make sure you use ground trim rather than in-air trim. I'm assuming you > start off on the ground. > > Dave > > On Fri, Nov 13, 2020, 2:38 PM Simon Julie Morley via Jsbsim-devel < > jsb...@li...> wrote: > >> When spawning in Outerra the turbine is rotating. >> >> We can initialise with the fuel cutoff to 1 but this seems to be after >> the fact that the engine was running,so it's on the slow down, from 6000 >> rpms that's quite a long slow down >> >> Is there a way to spawn without the engine having ever started ? >> >> regards >> >> Simon >> _______________________________________________ >> Jsbsim-devel mailing list >> Jsb...@li... >> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model project >> http://www.JSBSim.org >> _______________________________________________ >> >> _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: David C. <dp...@gm...> - 2020-11-14 00:51:22
|
Make sure you use ground trim rather than in-air trim. I'm assuming you start off on the ground. Dave On Fri, Nov 13, 2020, 2:38 PM Simon Julie Morley via Jsbsim-devel < jsb...@li...> wrote: > When spawning in Outerra the turbine is rotating. > > We can initialise with the fuel cutoff to 1 but this seems to be after the > fact that the engine was running,so it's on the slow down, from 6000 rpms > that's quite a long slow down > > Is there a way to spawn without the engine having ever started ? > > regards > > Simon > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: Simon J. M. <sim...@go...> - 2020-11-13 19:33:01
|
When spawning in Outerra the turbine is rotating. We can initialise with the fuel cutoff to 1 but this seems to be after the fact that the engine was running,so it's on the slow down, from 6000 rpms that's quite a long slow down Is there a way to spawn without the engine having ever started ? regards Simon |
|
From: Simon J. M. <sim...@go...> - 2020-11-08 09:58:17
|
Thomas,
You might already know or be interested in knowing that Titan are using
your bk117 in their sim
" <author> Thomas Kreitler </author>
<email> t.kreitler at web 056 de </email>
<filecreationdate>2010-10-07</filecreationdate>
<version>$Revision: 1.5 $</version>
<description> Models a Bell209/AH1S helicopter. </description>
"
regards
Simon
On Wed, 4 Nov 2020 at 22:01, Simon Julie Morley <
sim...@go...> wrote:
> For those that are interested... The flight model patch can be found here
>
> https://github.com/FGMEMBERS-NONGPL/UH-1
>
> On Fri, 30 Oct 2020, 09:39 Simon Julie Morley, <
> sim...@go...> wrote:
>
>> Come on, it wasn't that hard a question
>>
>> On Tue, 27 Oct 2020 at 15:54, Simon Julie Morley <
>> sim...@go...> wrote:
>>
>>> I'm not a C++ coder I work on xml code.
>>>
>>> It's not a case of ignoring rotor functionality but more a case of after
>>> 10+ years of only working on propellers, (in fact the first time i touched
>>> a turbine was doing the avatar Scorpion gunship) I'm extremely familiar
>>> with how the to create propeller tables and how the propeller code works.
>>>
>>> To answer the next question, without using any equations describe in
>>> your own words the requirements of, and how flapping is implemented in a
>>> real life helicopter and I'll explain how I do it with a prop.
>>>
>>> Simon
>>>
>>> On Tue, 27 Oct 2020 at 13:50, Sean McLeod <se...@se...> wrote:
>>>
>>>> Hi Simon
>>>>
>>>>
>>>>
>>>> Are you adding code to FGPropeller to implement some of the
>>>> functionality that is currently in FGRotor but not in FGPropeller currently?
>>>>
>>>>
>>>>
>>>> Are there some aspects of FGRotor’s functionality that you’re ignoring
>>>> because you don’t think they’re useful for your needs?
>>>>
>>>>
>>>>
>>>> What things did you notice in FGPropeller that FGRotor can’t currently
>>>> do? Could potentially be useful to add them to FGRotor for users of FGRotor.
>>>>
>>>>
>>>>
>>>> What’s quite useful is Thomas references the equations etc. that his
>>>> code is based on, e.g.
>>>>
>>>>
>>>>
>>>> // Flapping angles relative to control axes /SH79/ eqn(32)
>>>>
>>>> void FGRotor::calc_flapping_angles(double theta_0, const
>>>> FGColumnVector3 &pqr_fus_w)
>>>>
>>>>
>>>>
>>>> <dt>/SH79/</dt><dd>Shaugnessy, J. D., Deaux, Thomas N., and Yenni,
>>>> Kenneth R.,
>>>>
>>>> "Development and Validation of a Piloted Simulation of a
>>>>
>>>> Helicopter and External Sling Load", NASA TP-1285,
>>>> 1979.</dd>
>>>>
>>>>
>>>>
>>>> https://ntrs.nasa.gov/citations/19790005912
>>>>
>>>>
>>>>
>>>> I’m currently using FGotor for the helicopter models I’m working on so
>>>> I’d be interested to know what you see as the pros and cons of using
>>>> FGRotor versus FGPropeller.
>>>>
>>>>
>>>>
>>>> Cheers
>>>>
>>>>
>>>>
>>>> *From:* Simon Julie Morley via Jsbsim-devel <
>>>> jsb...@li...>
>>>> *Sent:* Monday, October 26, 2020 10:09 PM
>>>> *To:* Development issues <Jsb...@li...>
>>>> *Cc:* Simon Julie Morley <sim...@go...>
>>>> *Subject:* [Jsbsim-devel] Fwd: Helicopter
>>>>
>>>>
>>>>
>>>>
>>>> yeh I have, and there's nothing in it I can't do with a propeller,
>>>> and actually there are things in the propeller code that the rotor can't
>>>> do.... so using rotor is a net less...
>>>>
>>>>
>>>>
>>>> Simon
>>>>
>>>>
>>>>
>>>> ---------- Forwarded message ---------
>>>> From: *Sean McLeod* <se...@se...>
>>>> Date: Mon, 26 Oct 2020 at 20:00
>>>> Subject: RE: [Jsbsim-devel] Helicopter
>>>> To: Simon Julie Morley <sim...@go...>
>>>>
>>>>
>>>>
>>>> Hi Simon
>>>>
>>>>
>>>>
>>>> Have you looked at the FGRotor code to see what helicopter specific
>>>> stuff it models that isn’t modeled by FGPropeller?
>>>>
>>>>
>>>>
>>>> Cheers
>>>>
>>>>
>>>>
>>>> *From:* Simon Julie Morley <sim...@go...>
>>>> *Sent:* Monday, October 26, 2020 5:19 PM
>>>> *To:* Sean McLeod <se...@se...>
>>>> *Subject:* Re: [Jsbsim-devel] Helicopter
>>>>
>>>>
>>>>
>>>> Hi Sean,
>>>>
>>>>
>>>>
>>>> I'm not sure about using prop resulting in a lesser quality or that
>>>> rotor offering greater functionality...
>>>>
>>>>
>>>>
>>>> I remain open minded to the possibilities
>>>>
>>>>
>>>>
>>>> Simon.
>>>>
>>>>
>>>>
>>>> On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se...> wrote:
>>>>
>>>> Hi Simon
>>>>
>>>>
>>>>
>>>> I’m sure you can model a helicopter using FGPropeller etc. as a basis,
>>>> but I would imagine it would be a 1st order approximation since there
>>>> are a number of dynamics that FGPropeller doesn’t model compared to
>>>> FGRotor, so FGRotor would more easily allow for a higher fidelity model.
>>>>
>>>>
>>>>
>>>> Cheers
>>>>
>>>>
>>>>
>>>> *From:* Simon Julie Morley via Jsbsim-devel <
>>>> jsb...@li...>
>>>> *Sent:* Sunday, October 25, 2020 11:59 PM
>>>> *To:* Development issues <jsb...@li...>
>>>> *Cc:* Simon Julie Morley <sim...@go...>
>>>> *Subject:* Re: [Jsbsim-devel] Helicopter
>>>>
>>>>
>>>>
>>>> Hi Sean,
>>>>
>>>>
>>>>
>>>> To be honest I wanted to try and see if I could make a helicopter using
>>>> the prop code, because I couldn't see why not.
>>>>
>>>>
>>>>
>>>> On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se...> wrote:
>>>>
>>>> Hi Simon
>>>>
>>>>
>>>>
>>>> I’m just getting started again in terms of looking at JSBSim based
>>>> helicopter models.
>>>>
>>>>
>>>>
>>>> Thomas Kreitler improved the FGRotor model between 2010 – 2012.
>>>>
>>>>
>>>>
>>>>
>>>> https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp
>>>>
>>>>
>>>>
>>>> He also added a fairly detailed helicopter model for the AH1S:
>>>>
>>>>
>>>>
>>>>
>>>> https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s
>>>>
>>>>
>>>>
>>>> In general there are very few JSBSim based helicopter models around
>>>> when I last looked.
>>>>
>>>>
>>>>
>>>> Cheers
>>>>
>>>>
>>>>
>>>> *From:* Bill Galbraith <bil...@gm...>
>>>> *Sent:* Sunday, October 25, 2020 8:08 PM
>>>> *To:* 'Development issues' <jsb...@li...>
>>>> *Subject:* Re: [Jsbsim-devel] Helicopter
>>>>
>>>>
>>>>
>>>> Simon,
>>>>
>>>>
>>>>
>>>> I had devoted some brain cells towards that idea a while ago, but never
>>>> implemented it.
>>>>
>>>>
>>>>
>>>> Imagine a point mass, with a point vertical force located above it. At
>>>> 50% collective, vertical force equals weight. Cyclic tilts that vertical
>>>> force fore/aft, left/right. Displacing the cyclic yields a slight loss
>>>> (sine of angle) loss of lift, requiring slightly more collective.
>>>>
>>>>
>>>>
>>>> The painful part comes when you try to fly it with a joystick. When you
>>>> release the joystick, the cyclic returns back to neutral, the aircraft will
>>>> slow to a hover. You basically need a joystick that has a trim lever, or
>>>> allows you to reestablish the trim point.
>>>>
>>>>
>>>>
>>>> Enough to get your brain cells excited?
>>>>
>>>>
>>>>
>>>> Bill
>>>>
>>>>
>>>>
>>>> *From:* Simon Julie Morley via Jsbsim-devel [
>>>> mailto:jsb...@li...
>>>> <jsb...@li...>]
>>>> *Sent:* Sunday, October 25, 2020 1:41 PM
>>>> *To:* Development issues <Jsb...@li...>
>>>> *Cc:* Simon Julie Morley <sim...@go...>
>>>> *Subject:* [Jsbsim-devel] Helicopter
>>>>
>>>>
>>>>
>>>> Anyone here ever done one ?
>>>>
>>>>
>>>>
>>>> Want to talk about it, share knowledge ?
>>>>
>>>>
>>>>
>>>> Simon
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Jsbsim-devel mailing list
>>>> Jsb...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel
>>>> _______________________________________________
>>>> The JSBSim Flight Dynamics Model project
>>>> http://www.JSBSim.org
>>>> _______________________________________________
>>>>
>>>> _______________________________________________
>>>> Jsbsim-devel mailing list
>>>> Jsb...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel
>>>> _______________________________________________
>>>> The JSBSim Flight Dynamics Model project
>>>> http://www.JSBSim.org
>>>> _______________________________________________
>>>>
>>>>
|
|
From: Simon J. M. <sim...@go...> - 2020-11-04 22:02:08
|
For those that are interested... The flight model patch can be found here https://github.com/FGMEMBERS-NONGPL/UH-1 On Fri, 30 Oct 2020, 09:39 Simon Julie Morley, <sim...@go...> wrote: > Come on, it wasn't that hard a question > > On Tue, 27 Oct 2020 at 15:54, Simon Julie Morley < > sim...@go...> wrote: > >> I'm not a C++ coder I work on xml code. >> >> It's not a case of ignoring rotor functionality but more a case of after >> 10+ years of only working on propellers, (in fact the first time i touched >> a turbine was doing the avatar Scorpion gunship) I'm extremely familiar >> with how the to create propeller tables and how the propeller code works. >> >> To answer the next question, without using any equations describe in your >> own words the requirements of, and how flapping is implemented in a real >> life helicopter and I'll explain how I do it with a prop. >> >> Simon >> >> On Tue, 27 Oct 2020 at 13:50, Sean McLeod <se...@se...> wrote: >> >>> Hi Simon >>> >>> >>> >>> Are you adding code to FGPropeller to implement some of the >>> functionality that is currently in FGRotor but not in FGPropeller currently? >>> >>> >>> >>> Are there some aspects of FGRotor’s functionality that you’re ignoring >>> because you don’t think they’re useful for your needs? >>> >>> >>> >>> What things did you notice in FGPropeller that FGRotor can’t currently >>> do? Could potentially be useful to add them to FGRotor for users of FGRotor. >>> >>> >>> >>> What’s quite useful is Thomas references the equations etc. that his >>> code is based on, e.g. >>> >>> >>> >>> // Flapping angles relative to control axes /SH79/ eqn(32) >>> >>> void FGRotor::calc_flapping_angles(double theta_0, const FGColumnVector3 >>> &pqr_fus_w) >>> >>> >>> >>> <dt>/SH79/</dt><dd>Shaugnessy, J. D., Deaux, Thomas N., and Yenni, >>> Kenneth R., >>> >>> "Development and Validation of a Piloted Simulation of a >>> >>> Helicopter and External Sling Load", NASA TP-1285, >>> 1979.</dd> >>> >>> >>> >>> https://ntrs.nasa.gov/citations/19790005912 >>> >>> >>> >>> I’m currently using FGotor for the helicopter models I’m working on so >>> I’d be interested to know what you see as the pros and cons of using >>> FGRotor versus FGPropeller. >>> >>> >>> >>> Cheers >>> >>> >>> >>> *From:* Simon Julie Morley via Jsbsim-devel < >>> jsb...@li...> >>> *Sent:* Monday, October 26, 2020 10:09 PM >>> *To:* Development issues <Jsb...@li...> >>> *Cc:* Simon Julie Morley <sim...@go...> >>> *Subject:* [Jsbsim-devel] Fwd: Helicopter >>> >>> >>> >>> >>> yeh I have, and there's nothing in it I can't do with a propeller, and >>> actually there are things in the propeller code that the rotor can't do.... >>> so using rotor is a net less... >>> >>> >>> >>> Simon >>> >>> >>> >>> ---------- Forwarded message --------- >>> From: *Sean McLeod* <se...@se...> >>> Date: Mon, 26 Oct 2020 at 20:00 >>> Subject: RE: [Jsbsim-devel] Helicopter >>> To: Simon Julie Morley <sim...@go...> >>> >>> >>> >>> Hi Simon >>> >>> >>> >>> Have you looked at the FGRotor code to see what helicopter specific >>> stuff it models that isn’t modeled by FGPropeller? >>> >>> >>> >>> Cheers >>> >>> >>> >>> *From:* Simon Julie Morley <sim...@go...> >>> *Sent:* Monday, October 26, 2020 5:19 PM >>> *To:* Sean McLeod <se...@se...> >>> *Subject:* Re: [Jsbsim-devel] Helicopter >>> >>> >>> >>> Hi Sean, >>> >>> >>> >>> I'm not sure about using prop resulting in a lesser quality or that >>> rotor offering greater functionality... >>> >>> >>> >>> I remain open minded to the possibilities >>> >>> >>> >>> Simon. >>> >>> >>> >>> On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se...> wrote: >>> >>> Hi Simon >>> >>> >>> >>> I’m sure you can model a helicopter using FGPropeller etc. as a basis, >>> but I would imagine it would be a 1st order approximation since there >>> are a number of dynamics that FGPropeller doesn’t model compared to >>> FGRotor, so FGRotor would more easily allow for a higher fidelity model. >>> >>> >>> >>> Cheers >>> >>> >>> >>> *From:* Simon Julie Morley via Jsbsim-devel < >>> jsb...@li...> >>> *Sent:* Sunday, October 25, 2020 11:59 PM >>> *To:* Development issues <jsb...@li...> >>> *Cc:* Simon Julie Morley <sim...@go...> >>> *Subject:* Re: [Jsbsim-devel] Helicopter >>> >>> >>> >>> Hi Sean, >>> >>> >>> >>> To be honest I wanted to try and see if I could make a helicopter using >>> the prop code, because I couldn't see why not. >>> >>> >>> >>> On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se...> wrote: >>> >>> Hi Simon >>> >>> >>> >>> I’m just getting started again in terms of looking at JSBSim based >>> helicopter models. >>> >>> >>> >>> Thomas Kreitler improved the FGRotor model between 2010 – 2012. >>> >>> >>> >>> >>> https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp >>> >>> >>> >>> He also added a fairly detailed helicopter model for the AH1S: >>> >>> >>> >>> >>> https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s >>> >>> >>> >>> In general there are very few JSBSim based helicopter models around when >>> I last looked. >>> >>> >>> >>> Cheers >>> >>> >>> >>> *From:* Bill Galbraith <bil...@gm...> >>> *Sent:* Sunday, October 25, 2020 8:08 PM >>> *To:* 'Development issues' <jsb...@li...> >>> *Subject:* Re: [Jsbsim-devel] Helicopter >>> >>> >>> >>> Simon, >>> >>> >>> >>> I had devoted some brain cells towards that idea a while ago, but never >>> implemented it. >>> >>> >>> >>> Imagine a point mass, with a point vertical force located above it. At >>> 50% collective, vertical force equals weight. Cyclic tilts that vertical >>> force fore/aft, left/right. Displacing the cyclic yields a slight loss >>> (sine of angle) loss of lift, requiring slightly more collective. >>> >>> >>> >>> The painful part comes when you try to fly it with a joystick. When you >>> release the joystick, the cyclic returns back to neutral, the aircraft will >>> slow to a hover. You basically need a joystick that has a trim lever, or >>> allows you to reestablish the trim point. >>> >>> >>> >>> Enough to get your brain cells excited? >>> >>> >>> >>> Bill >>> >>> >>> >>> *From:* Simon Julie Morley via Jsbsim-devel [ >>> mailto:jsb...@li... >>> <jsb...@li...>] >>> *Sent:* Sunday, October 25, 2020 1:41 PM >>> *To:* Development issues <Jsb...@li...> >>> *Cc:* Simon Julie Morley <sim...@go...> >>> *Subject:* [Jsbsim-devel] Helicopter >>> >>> >>> >>> Anyone here ever done one ? >>> >>> >>> >>> Want to talk about it, share knowledge ? >>> >>> >>> >>> Simon >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Jsbsim-devel mailing list >>> Jsb...@li... >>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >>> _______________________________________________ >>> The JSBSim Flight Dynamics Model project >>> http://www.JSBSim.org >>> _______________________________________________ >>> >>> _______________________________________________ >>> Jsbsim-devel mailing list >>> Jsb...@li... >>> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >>> _______________________________________________ >>> The JSBSim Flight Dynamics Model project >>> http://www.JSBSim.org >>> _______________________________________________ >>> >>> |
|
From: Simon J. M. <sim...@go...> - 2020-10-30 09:39:57
|
Come on, it wasn't that hard a question On Tue, 27 Oct 2020 at 15:54, Simon Julie Morley < sim...@go...> wrote: > I'm not a C++ coder I work on xml code. > > It's not a case of ignoring rotor functionality but more a case of after > 10+ years of only working on propellers, (in fact the first time i touched > a turbine was doing the avatar Scorpion gunship) I'm extremely familiar > with how the to create propeller tables and how the propeller code works. > > To answer the next question, without using any equations describe in your > own words the requirements of, and how flapping is implemented in a real > life helicopter and I'll explain how I do it with a prop. > > Simon > > On Tue, 27 Oct 2020 at 13:50, Sean McLeod <se...@se...> wrote: > >> Hi Simon >> >> >> >> Are you adding code to FGPropeller to implement some of the functionality >> that is currently in FGRotor but not in FGPropeller currently? >> >> >> >> Are there some aspects of FGRotor’s functionality that you’re ignoring >> because you don’t think they’re useful for your needs? >> >> >> >> What things did you notice in FGPropeller that FGRotor can’t currently >> do? Could potentially be useful to add them to FGRotor for users of FGRotor. >> >> >> >> What’s quite useful is Thomas references the equations etc. that his code >> is based on, e.g. >> >> >> >> // Flapping angles relative to control axes /SH79/ eqn(32) >> >> void FGRotor::calc_flapping_angles(double theta_0, const FGColumnVector3 >> &pqr_fus_w) >> >> >> >> <dt>/SH79/</dt><dd>Shaugnessy, J. D., Deaux, Thomas N., and Yenni, >> Kenneth R., >> >> "Development and Validation of a Piloted Simulation of a >> >> Helicopter and External Sling Load", NASA TP-1285, >> 1979.</dd> >> >> >> >> https://ntrs.nasa.gov/citations/19790005912 >> >> >> >> I’m currently using FGotor for the helicopter models I’m working on so >> I’d be interested to know what you see as the pros and cons of using >> FGRotor versus FGPropeller. >> >> >> >> Cheers >> >> >> >> *From:* Simon Julie Morley via Jsbsim-devel < >> jsb...@li...> >> *Sent:* Monday, October 26, 2020 10:09 PM >> *To:* Development issues <Jsb...@li...> >> *Cc:* Simon Julie Morley <sim...@go...> >> *Subject:* [Jsbsim-devel] Fwd: Helicopter >> >> >> >> >> yeh I have, and there's nothing in it I can't do with a propeller, and >> actually there are things in the propeller code that the rotor can't do.... >> so using rotor is a net less... >> >> >> >> Simon >> >> >> >> ---------- Forwarded message --------- >> From: *Sean McLeod* <se...@se...> >> Date: Mon, 26 Oct 2020 at 20:00 >> Subject: RE: [Jsbsim-devel] Helicopter >> To: Simon Julie Morley <sim...@go...> >> >> >> >> Hi Simon >> >> >> >> Have you looked at the FGRotor code to see what helicopter specific stuff >> it models that isn’t modeled by FGPropeller? >> >> >> >> Cheers >> >> >> >> *From:* Simon Julie Morley <sim...@go...> >> *Sent:* Monday, October 26, 2020 5:19 PM >> *To:* Sean McLeod <se...@se...> >> *Subject:* Re: [Jsbsim-devel] Helicopter >> >> >> >> Hi Sean, >> >> >> >> I'm not sure about using prop resulting in a lesser quality or that rotor >> offering greater functionality... >> >> >> >> I remain open minded to the possibilities >> >> >> >> Simon. >> >> >> >> On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se...> wrote: >> >> Hi Simon >> >> >> >> I’m sure you can model a helicopter using FGPropeller etc. as a basis, >> but I would imagine it would be a 1st order approximation since there >> are a number of dynamics that FGPropeller doesn’t model compared to >> FGRotor, so FGRotor would more easily allow for a higher fidelity model. >> >> >> >> Cheers >> >> >> >> *From:* Simon Julie Morley via Jsbsim-devel < >> jsb...@li...> >> *Sent:* Sunday, October 25, 2020 11:59 PM >> *To:* Development issues <jsb...@li...> >> *Cc:* Simon Julie Morley <sim...@go...> >> *Subject:* Re: [Jsbsim-devel] Helicopter >> >> >> >> Hi Sean, >> >> >> >> To be honest I wanted to try and see if I could make a helicopter using >> the prop code, because I couldn't see why not. >> >> >> >> On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se...> wrote: >> >> Hi Simon >> >> >> >> I’m just getting started again in terms of looking at JSBSim based >> helicopter models. >> >> >> >> Thomas Kreitler improved the FGRotor model between 2010 – 2012. >> >> >> >> >> https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp >> >> >> >> He also added a fairly detailed helicopter model for the AH1S: >> >> >> >> >> https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s >> >> >> >> In general there are very few JSBSim based helicopter models around when >> I last looked. >> >> >> >> Cheers >> >> >> >> *From:* Bill Galbraith <bil...@gm...> >> *Sent:* Sunday, October 25, 2020 8:08 PM >> *To:* 'Development issues' <jsb...@li...> >> *Subject:* Re: [Jsbsim-devel] Helicopter >> >> >> >> Simon, >> >> >> >> I had devoted some brain cells towards that idea a while ago, but never >> implemented it. >> >> >> >> Imagine a point mass, with a point vertical force located above it. At >> 50% collective, vertical force equals weight. Cyclic tilts that vertical >> force fore/aft, left/right. Displacing the cyclic yields a slight loss >> (sine of angle) loss of lift, requiring slightly more collective. >> >> >> >> The painful part comes when you try to fly it with a joystick. When you >> release the joystick, the cyclic returns back to neutral, the aircraft will >> slow to a hover. You basically need a joystick that has a trim lever, or >> allows you to reestablish the trim point. >> >> >> >> Enough to get your brain cells excited? >> >> >> >> Bill >> >> >> >> *From:* Simon Julie Morley via Jsbsim-devel [ >> mailto:jsb...@li... >> <jsb...@li...>] >> *Sent:* Sunday, October 25, 2020 1:41 PM >> *To:* Development issues <Jsb...@li...> >> *Cc:* Simon Julie Morley <sim...@go...> >> *Subject:* [Jsbsim-devel] Helicopter >> >> >> >> Anyone here ever done one ? >> >> >> >> Want to talk about it, share knowledge ? >> >> >> >> Simon >> >> >> >> >> >> >> >> _______________________________________________ >> Jsbsim-devel mailing list >> Jsb...@li... >> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model project >> http://www.JSBSim.org >> _______________________________________________ >> >> _______________________________________________ >> Jsbsim-devel mailing list >> Jsb...@li... >> https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> _______________________________________________ >> The JSBSim Flight Dynamics Model project >> http://www.JSBSim.org >> _______________________________________________ >> >> |
|
From: Simon J. M. <sim...@go...> - 2020-10-27 15:54:31
|
I'm not a C++ coder I work on xml code. It's not a case of ignoring rotor functionality but more a case of after 10+ years of only working on propellers, (in fact the first time i touched a turbine was doing the avatar Scorpion gunship) I'm extremely familiar with how the to create propeller tables and how the propeller code works. To answer the next question, without using any equations describe in your own words the requirements of, and how flapping is implemented in a real life helicopter and I'll explain how I do it with a prop. Simon On Tue, 27 Oct 2020 at 13:50, Sean McLeod <se...@se...> wrote: > Hi Simon > > > > Are you adding code to FGPropeller to implement some of the functionality > that is currently in FGRotor but not in FGPropeller currently? > > > > Are there some aspects of FGRotor’s functionality that you’re ignoring > because you don’t think they’re useful for your needs? > > > > What things did you notice in FGPropeller that FGRotor can’t currently do? > Could potentially be useful to add them to FGRotor for users of FGRotor. > > > > What’s quite useful is Thomas references the equations etc. that his code > is based on, e.g. > > > > // Flapping angles relative to control axes /SH79/ eqn(32) > > void FGRotor::calc_flapping_angles(double theta_0, const FGColumnVector3 & > pqr_fus_w) > > > > <dt>/SH79/</dt><dd>Shaugnessy, J. D., Deaux, Thomas N., and Yenni, > Kenneth R., > > "Development and Validation of a Piloted Simulation of a > > Helicopter and External Sling Load", NASA TP-1285, > 1979.</dd> > > > > https://ntrs.nasa.gov/citations/19790005912 > > > > I’m currently using FGotor for the helicopter models I’m working on so I’d > be interested to know what you see as the pros and cons of using FGRotor > versus FGPropeller. > > > > Cheers > > > > *From:* Simon Julie Morley via Jsbsim-devel < > jsb...@li...> > *Sent:* Monday, October 26, 2020 10:09 PM > *To:* Development issues <Jsb...@li...> > *Cc:* Simon Julie Morley <sim...@go...> > *Subject:* [Jsbsim-devel] Fwd: Helicopter > > > > > yeh I have, and there's nothing in it I can't do with a propeller, and > actually there are things in the propeller code that the rotor can't do.... > so using rotor is a net less... > > > > Simon > > > > ---------- Forwarded message --------- > From: *Sean McLeod* <se...@se...> > Date: Mon, 26 Oct 2020 at 20:00 > Subject: RE: [Jsbsim-devel] Helicopter > To: Simon Julie Morley <sim...@go...> > > > > Hi Simon > > > > Have you looked at the FGRotor code to see what helicopter specific stuff > it models that isn’t modeled by FGPropeller? > > > > Cheers > > > > *From:* Simon Julie Morley <sim...@go...> > *Sent:* Monday, October 26, 2020 5:19 PM > *To:* Sean McLeod <se...@se...> > *Subject:* Re: [Jsbsim-devel] Helicopter > > > > Hi Sean, > > > > I'm not sure about using prop resulting in a lesser quality or that rotor > offering greater functionality... > > > > I remain open minded to the possibilities > > > > Simon. > > > > On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se...> wrote: > > Hi Simon > > > > I’m sure you can model a helicopter using FGPropeller etc. as a basis, but > I would imagine it would be a 1st order approximation since there are a > number of dynamics that FGPropeller doesn’t model compared to FGRotor, so > FGRotor would more easily allow for a higher fidelity model. > > > > Cheers > > > > *From:* Simon Julie Morley via Jsbsim-devel < > jsb...@li...> > *Sent:* Sunday, October 25, 2020 11:59 PM > *To:* Development issues <jsb...@li...> > *Cc:* Simon Julie Morley <sim...@go...> > *Subject:* Re: [Jsbsim-devel] Helicopter > > > > Hi Sean, > > > > To be honest I wanted to try and see if I could make a helicopter using > the prop code, because I couldn't see why not. > > > > On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se...> wrote: > > Hi Simon > > > > I’m just getting started again in terms of looking at JSBSim based > helicopter models. > > > > Thomas Kreitler improved the FGRotor model between 2010 – 2012. > > > > > https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp > > > > He also added a fairly detailed helicopter model for the AH1S: > > > > > https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s > > > > In general there are very few JSBSim based helicopter models around when I > last looked. > > > > Cheers > > > > *From:* Bill Galbraith <bil...@gm...> > *Sent:* Sunday, October 25, 2020 8:08 PM > *To:* 'Development issues' <jsb...@li...> > *Subject:* Re: [Jsbsim-devel] Helicopter > > > > Simon, > > > > I had devoted some brain cells towards that idea a while ago, but never > implemented it. > > > > Imagine a point mass, with a point vertical force located above it. At 50% > collective, vertical force equals weight. Cyclic tilts that vertical force > fore/aft, left/right. Displacing the cyclic yields a slight loss (sine of > angle) loss of lift, requiring slightly more collective. > > > > The painful part comes when you try to fly it with a joystick. When you > release the joystick, the cyclic returns back to neutral, the aircraft will > slow to a hover. You basically need a joystick that has a trim lever, or > allows you to reestablish the trim point. > > > > Enough to get your brain cells excited? > > > > Bill > > > > *From:* Simon Julie Morley via Jsbsim-devel [ > mailto:jsb...@li... > <jsb...@li...>] > *Sent:* Sunday, October 25, 2020 1:41 PM > *To:* Development issues <Jsb...@li...> > *Cc:* Simon Julie Morley <sim...@go...> > *Subject:* [Jsbsim-devel] Helicopter > > > > Anyone here ever done one ? > > > > Want to talk about it, share knowledge ? > > > > Simon > > > > > > > > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > _______________________________________________ > Jsbsim-devel mailing list > Jsb...@li... > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > |
|
From: Sean M. <se...@se...> - 2020-10-27 13:50:42
|
Hi Simon
Are you adding code to FGPropeller to implement some of the functionality that is currently in FGRotor but not in FGPropeller currently?
Are there some aspects of FGRotor’s functionality that you’re ignoring because you don’t think they’re useful for your needs?
What things did you notice in FGPropeller that FGRotor can’t currently do? Could potentially be useful to add them to FGRotor for users of FGRotor.
What’s quite useful is Thomas references the equations etc. that his code is based on, e.g.
// Flapping angles relative to control axes /SH79/ eqn(32)
void FGRotor::calc_flapping_angles(double theta_0, const FGColumnVector3 &pqr_fus_w)
<dt>/SH79/</dt><dd>Shaugnessy, J. D., Deaux, Thomas N., and Yenni, Kenneth R.,
"Development and Validation of a Piloted Simulation of a
Helicopter and External Sling Load", NASA TP-1285, 1979.</dd>
https://ntrs.nasa.gov/citations/19790005912
I’m currently using FGotor for the helicopter models I’m working on so I’d be interested to know what you see as the pros and cons of using FGRotor versus FGPropeller.
Cheers
From: Simon Julie Morley via Jsbsim-devel <jsb...@li...>
Sent: Monday, October 26, 2020 10:09 PM
To: Development issues <Jsb...@li...>
Cc: Simon Julie Morley <sim...@go...>
Subject: [Jsbsim-devel] Fwd: Helicopter
yeh I have, and there's nothing in it I can't do with a propeller, and actually there are things in the propeller code that the rotor can't do.... so using rotor is a net less...
Simon
---------- Forwarded message ---------
From: Sean McLeod <se...@se...<mailto:se...@se...>>
Date: Mon, 26 Oct 2020 at 20:00
Subject: RE: [Jsbsim-devel] Helicopter
To: Simon Julie Morley <sim...@go...<mailto:sim...@go...>>
Hi Simon
Have you looked at the FGRotor code to see what helicopter specific stuff it models that isn’t modeled by FGPropeller?
Cheers
From: Simon Julie Morley <sim...@go...<mailto:sim...@go...>>
Sent: Monday, October 26, 2020 5:19 PM
To: Sean McLeod <se...@se...<mailto:se...@se...>>
Subject: Re: [Jsbsim-devel] Helicopter
Hi Sean,
I'm not sure about using prop resulting in a lesser quality or that rotor offering greater functionality...
I remain open minded to the possibilities
Simon.
On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se...<mailto:se...@se...>> wrote:
Hi Simon
I’m sure you can model a helicopter using FGPropeller etc. as a basis, but I would imagine it would be a 1st order approximation since there are a number of dynamics that FGPropeller doesn’t model compared to FGRotor, so FGRotor would more easily allow for a higher fidelity model.
Cheers
From: Simon Julie Morley via Jsbsim-devel <jsb...@li...<mailto:jsb...@li...>>
Sent: Sunday, October 25, 2020 11:59 PM
To: Development issues <jsb...@li...<mailto:jsb...@li...>>
Cc: Simon Julie Morley <sim...@go...<mailto:sim...@go...>>
Subject: Re: [Jsbsim-devel] Helicopter
Hi Sean,
To be honest I wanted to try and see if I could make a helicopter using the prop code, because I couldn't see why not.
On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se...<mailto:se...@se...>> wrote:
Hi Simon
I’m just getting started again in terms of looking at JSBSim based helicopter models.
Thomas Kreitler improved the FGRotor model between 2010 – 2012.
https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp
He also added a fairly detailed helicopter model for the AH1S:
https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s
In general there are very few JSBSim based helicopter models around when I last looked.
Cheers
From: Bill Galbraith <bil...@gm...<mailto:bil...@gm...>>
Sent: Sunday, October 25, 2020 8:08 PM
To: 'Development issues' <jsb...@li...<mailto:jsb...@li...>>
Subject: Re: [Jsbsim-devel] Helicopter
Simon,
I had devoted some brain cells towards that idea a while ago, but never implemented it.
Imagine a point mass, with a point vertical force located above it. At 50% collective, vertical force equals weight. Cyclic tilts that vertical force fore/aft, left/right. Displacing the cyclic yields a slight loss (sine of angle) loss of lift, requiring slightly more collective.
The painful part comes when you try to fly it with a joystick. When you release the joystick, the cyclic returns back to neutral, the aircraft will slow to a hover. You basically need a joystick that has a trim lever, or allows you to reestablish the trim point.
Enough to get your brain cells excited?
Bill
From: Simon Julie Morley via Jsbsim-devel [mailto:jsb...@li...]
Sent: Sunday, October 25, 2020 1:41 PM
To: Development issues <Jsb...@li...<mailto:Jsb...@li...>>
Cc: Simon Julie Morley <sim...@go...<mailto:sim...@go...>>
Subject: [Jsbsim-devel] Helicopter
Anyone here ever done one ?
Want to talk about it, share knowledge ?
Simon
_______________________________________________
Jsbsim-devel mailing list
Jsb...@li...<mailto:Jsb...@li...>
https://lists.sourceforge.net/lists/listinfo/jsbsim-devel
_______________________________________________
The JSBSim Flight Dynamics Model project
http://www.JSBSim.org
_______________________________________________
|
|
From: Simon J. M. <sim...@go...> - 2020-10-27 12:35:22
|
Out of curiosity, I've had to create a pendulum damping force as a helicopter rotates around it's rotor, as opposed to it's CoG. Did anyone else have this issue, and how did you resolve it. Simon On Tue, 27 Oct 2020 at 09:40, Simon Julie Morley < sim...@go...> wrote: > Ok to answer the question about the tail rotor. > > It's a force that produces a moment equal and opposite to the main rotor > n_moment. The collective increases or reduces this force value by up to 10% > > On Tue, 27 Oct 2020, 00:56 Thomas, <kre...@mo...> wrote: > >> Hi Simon, >> >> sorry now for quoting into your response. >> >> Simon Julie Morley wrote: >> > No offense intended, it's not like I'm critising jsbsim as I'm using it. >> >> IMHO, youre welcome >> >> > >> > I chose to attempt to model a helicopter by adapting the propeller >> > code.... I shouldn't be critised for doing this. >> >> Well, call/interpretate the critism just as 'questions' about your >> intention, or simply as advice (you are trying something new, or?), >> since I guess the people in this forum all have their individual >> 'zugang' to jsbsim. >> >> > >> > This is my hobby, if you feel me doing something is a personal insult >> > and that we shouldn't talk about it, and that I shouldn't answer >> > questions raised to me then I'm at a loss as to the point of this >> forum.. >> >> No, again, feel free to exercise jsbsim -- but what's wrong about >> explaining what you like to do? My answer was a respose to your >> statement. Should I accept it, or should I pose a question? >> Alternatively, this could be a starting point for a discussion... >> >> Thomas >> >> >> > >> > Simon >> > >> > On Mon, 26 Oct 2020, 22:47 Thomas, <kre...@mo... >> > <mailto:kre...@mo...>> wrote: >> > >> > Hello Simon, >> > >> > I'm a bit offended by your claim -- CIT: 'there's nothing in it I >> can't >> > do with a propeller'. >> > >> > Allow me one question: how do you intend to treat the tail-rotor? >> > >> > Anyway, I'm curious about your results. 'think that the propeller is >> > better suited to model mid-size quad-drones and the like. >> > >> > Kind Regards, >> > >> > Thomas >> > >> > P.S. As for the rotor-model, two pointers for reading: >> > >> > /br/ >> > >> https://www.elsevier.com/books/bramwells-helicopter-dynamics/bramwell/978-0-08-097404-0 >> > >> > /sh/ Shaugnessy, J. D., Deaux, Thomas N., and Yenni, Kenneth R., >> > "Development and Validation of a Piloted Simulation of a Helicopter >> and >> > External Sling Load", NASA TP-1285, 1979 >> > >> > >> > Simon Julie Morley via Jsbsim-devel wrote: >> > > >> > > yeh I have, and there's nothing in it I can't do with a >> propeller, >> > > and actually there are things in the propeller code that the >> > rotor can't >> > > do.... so using rotor is a net less... >> > > >> > > Simon >> > > >> > > ---------- Forwarded message --------- >> > > From: *Sean McLeod* <se...@se... >> > <mailto:se...@se...> <mailto:se...@se... >> > <mailto:se...@se...>>> >> > > Date: Mon, 26 Oct 2020 at 20:00 >> > > Subject: RE: [Jsbsim-devel] Helicopter >> > > To: Simon Julie Morley <sim...@go... >> > <mailto:sim...@go...> >> > > <mailto:sim...@go... >> > <mailto:sim...@go...>>> >> > > >> > > >> > > Hi Simon____ >> > > >> > > __ __ >> > > >> > > Have you looked at the FGRotor code to see what helicopter >> specific >> > > stuff it models that isn’t modeled by FGPropeller?____ >> > > >> > > __ __ >> > > >> > > Cheers____ >> > > >> > > __ __ >> > > >> > > *From:* Simon Julie Morley <sim...@go... >> > <mailto:sim...@go...> >> > > <mailto:sim...@go... >> > <mailto:sim...@go...>>> >> > > *Sent:* Monday, October 26, 2020 5:19 PM >> > > *To:* Sean McLeod <se...@se... >> > <mailto:se...@se...> <mailto:se...@se... >> > <mailto:se...@se...>>> >> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ >> > > >> > > __ __ >> > > >> > > Hi Sean,____ >> > > >> > > __ __ >> > > >> > > I'm not sure about using prop resulting in a lesser quality or >> that >> > > rotor offering greater functionality...____ >> > > >> > > __ __ >> > > >> > > I remain open minded to the possibilities____ >> > > >> > > __ __ >> > > >> > > Simon.____ >> > > >> > > __ __ >> > > >> > > On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se... >> > <mailto:se...@se...> >> > > <mailto:se...@se... <mailto:se...@se...>>> >> wrote:____ >> > > >> > > Hi Simon____ >> > > >> > > ____ >> > > >> > > I’m sure you can model a helicopter using FGPropeller etc. >> as a >> > > basis, but I would imagine it would be a 1^st order >> approximation >> > > since there are a number of dynamics that FGPropeller doesn’t >> > model >> > > compared to FGRotor, so FGRotor would more easily allow for a >> > higher >> > > fidelity model.____ >> > > >> > > ____ >> > > >> > > Cheers____ >> > > >> > > ____ >> > > >> > > *From:* Simon Julie Morley via Jsbsim-devel >> > > <jsb...@li... >> > <mailto:jsb...@li...> >> > > <mailto:jsb...@li... >> > <mailto:jsb...@li...>>> >> > > *Sent:* Sunday, October 25, 2020 11:59 PM >> > > *To:* Development issues <jsb...@li... >> > <mailto:jsb...@li...> >> > > <mailto:jsb...@li... >> > <mailto:jsb...@li...>>> >> > > *Cc:* Simon Julie Morley <sim...@go... >> > <mailto:sim...@go...> >> > > <mailto:sim...@go... >> > <mailto:sim...@go...>>> >> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ >> > > >> > > ____ >> > > >> > > Hi Sean, ____ >> > > >> > > ____ >> > > >> > > To be honest I wanted to try and see if I could make a >> helicopter >> > > using the prop code, because I couldn't see why not.____ >> > > >> > > ____ >> > > >> > > On Sun, 25 Oct 2020 at 21:12, Sean McLeod >> > <se...@se... <mailto:se...@se...> >> > > <mailto:se...@se... <mailto:se...@se...>>> >> > wrote:____ >> > > >> > > Hi Simon____ >> > > >> > > ____ >> > > >> > > I’m just getting started again in terms of looking at >> JSBSim >> > > based helicopter models.____ >> > > >> > > ____ >> > > >> > > Thomas Kreitler improved the FGRotor model between 2010 – >> > 2012.____ >> > > >> > > ____ >> > > >> > > >> > >> https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp____ >> > > >> > > ____ >> > > >> > > He also added a fairly detailed helicopter model for the >> > AH1S:____ >> > > >> > > ____ >> > > >> > > >> > >> https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s____ >> > > >> > > ____ >> > > >> > > In general there are very few JSBSim based helicopter >> models >> > > around when I last looked.____ >> > > >> > > ____ >> > > >> > > Cheers____ >> > > >> > > ____ >> > > >> > > *From:* Bill Galbraith <bil...@gm... >> > <mailto:bil...@gm...> >> > > <mailto:bil...@gm... >> > <mailto:bil...@gm...>>> >> > > *Sent:* Sunday, October 25, 2020 8:08 PM >> > > *To:* 'Development issues' >> > <jsb...@li... >> > <mailto:jsb...@li...> >> > > <mailto:jsb...@li... >> > <mailto:jsb...@li...>>> >> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ >> > > >> > > ____ >> > > >> > > Simon,____ >> > > >> > > ____ >> > > >> > > I had devoted some brain cells towards that idea a while >> ago, >> > > but never implemented it.____ >> > > >> > > ____ >> > > >> > > Imagine a point mass, with a point vertical force located >> > above >> > > it. At 50% collective, vertical force equals weight. >> Cyclic >> > > tilts that vertical force fore/aft, left/right. >> > Displacing the >> > > cyclic yields a slight loss (sine of angle) loss of lift, >> > > requiring slightly more collective.____ >> > > >> > > ____ >> > > >> > > The painful part comes when you try to fly it with a >> > joystick. >> > > When you release the joystick, the cyclic returns back to >> > > neutral, the aircraft will slow to a hover. You basically >> > need a >> > > joystick that has a trim lever, or allows you to >> > reestablish the >> > > trim point.____ >> > > >> > > ____ >> > > >> > > Enough to get your brain cells excited?____ >> > > >> > > ____ >> > > >> > > Bill____ >> > > >> > > ____ >> > > >> > > *From:* Simon Julie Morley via Jsbsim-devel >> > > [mailto:jsb...@li... >> > <mailto:jsb...@li...>] >> > > *Sent:* Sunday, October 25, 2020 1:41 PM >> > > *To:* Development issues >> > <Jsb...@li... >> > <mailto:Jsb...@li...> >> > > <mailto:Jsb...@li... >> > <mailto:Jsb...@li...>>> >> > > *Cc:* Simon Julie Morley <sim...@go... >> > <mailto:sim...@go...> >> > > <mailto:sim...@go... >> > <mailto:sim...@go...>>> >> > > *Subject:* [Jsbsim-devel] Helicopter____ >> > > >> > > ____ >> > > >> > > Anyone here ever done one ?____ >> > > >> > > ____ >> > > >> > > Want to talk about it, share knowledge ?____ >> > > >> > > ____ >> > > >> > > Simon____ >> > > >> > > ____ >> > > >> > > ____ >> > > >> > > ____ >> > > >> > > _______________________________________________ >> > > Jsbsim-devel mailing list >> > > Jsb...@li... >> > <mailto:Jsb...@li...> >> > > <mailto:Jsb...@li... >> > <mailto:Jsb...@li...>> >> > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> > > _______________________________________________ >> > > The JSBSim Flight Dynamics Model project >> > > http://www.JSBSim.org >> > > ___________________________________________________ >> > > >> > > >> > > >> > > >> > > >> > > _______________________________________________ >> > > Jsbsim-devel mailing list >> > > Jsb...@li... >> > <mailto:Jsb...@li...> >> > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel >> > > _______________________________________________ >> > > The JSBSim Flight Dynamics Model project >> > > http://www.JSBSim.org >> > > _______________________________________________ >> > > >> > >> > -- >> > Thomas Kreitler - Information Retrieval >> > kre...@mo... <mailto:kre...@mo...> >> > 49/30/8413 1702 >> > >> >> -- >> Thomas Kreitler - Information Retrieval >> kre...@mo... >> 49/30/8413 1702 >> > |
|
From: Simon J. M. <sim...@go...> - 2020-10-27 09:40:52
|
Ok to answer the question about the tail rotor. It's a force that produces a moment equal and opposite to the main rotor n_moment. The collective increases or reduces this force value by up to 10% On Tue, 27 Oct 2020, 00:56 Thomas, <kre...@mo...> wrote: > Hi Simon, > > sorry now for quoting into your response. > > Simon Julie Morley wrote: > > No offense intended, it's not like I'm critising jsbsim as I'm using it. > > IMHO, youre welcome > > > > > I chose to attempt to model a helicopter by adapting the propeller > > code.... I shouldn't be critised for doing this. > > Well, call/interpretate the critism just as 'questions' about your > intention, or simply as advice (you are trying something new, or?), > since I guess the people in this forum all have their individual > 'zugang' to jsbsim. > > > > > This is my hobby, if you feel me doing something is a personal insult > > and that we shouldn't talk about it, and that I shouldn't answer > > questions raised to me then I'm at a loss as to the point of this forum.. > > No, again, feel free to exercise jsbsim -- but what's wrong about > explaining what you like to do? My answer was a respose to your > statement. Should I accept it, or should I pose a question? > Alternatively, this could be a starting point for a discussion... > > Thomas > > > > > > Simon > > > > On Mon, 26 Oct 2020, 22:47 Thomas, <kre...@mo... > > <mailto:kre...@mo...>> wrote: > > > > Hello Simon, > > > > I'm a bit offended by your claim -- CIT: 'there's nothing in it I > can't > > do with a propeller'. > > > > Allow me one question: how do you intend to treat the tail-rotor? > > > > Anyway, I'm curious about your results. 'think that the propeller is > > better suited to model mid-size quad-drones and the like. > > > > Kind Regards, > > > > Thomas > > > > P.S. As for the rotor-model, two pointers for reading: > > > > /br/ > > > https://www.elsevier.com/books/bramwells-helicopter-dynamics/bramwell/978-0-08-097404-0 > > > > /sh/ Shaugnessy, J. D., Deaux, Thomas N., and Yenni, Kenneth R., > > "Development and Validation of a Piloted Simulation of a Helicopter > and > > External Sling Load", NASA TP-1285, 1979 > > > > > > Simon Julie Morley via Jsbsim-devel wrote: > > > > > > yeh I have, and there's nothing in it I can't do with a > propeller, > > > and actually there are things in the propeller code that the > > rotor can't > > > do.... so using rotor is a net less... > > > > > > Simon > > > > > > ---------- Forwarded message --------- > > > From: *Sean McLeod* <se...@se... > > <mailto:se...@se...> <mailto:se...@se... > > <mailto:se...@se...>>> > > > Date: Mon, 26 Oct 2020 at 20:00 > > > Subject: RE: [Jsbsim-devel] Helicopter > > > To: Simon Julie Morley <sim...@go... > > <mailto:sim...@go...> > > > <mailto:sim...@go... > > <mailto:sim...@go...>>> > > > > > > > > > Hi Simon____ > > > > > > __ __ > > > > > > Have you looked at the FGRotor code to see what helicopter > specific > > > stuff it models that isn’t modeled by FGPropeller?____ > > > > > > __ __ > > > > > > Cheers____ > > > > > > __ __ > > > > > > *From:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...> > > > <mailto:sim...@go... > > <mailto:sim...@go...>>> > > > *Sent:* Monday, October 26, 2020 5:19 PM > > > *To:* Sean McLeod <se...@se... > > <mailto:se...@se...> <mailto:se...@se... > > <mailto:se...@se...>>> > > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > > > __ __ > > > > > > Hi Sean,____ > > > > > > __ __ > > > > > > I'm not sure about using prop resulting in a lesser quality or > that > > > rotor offering greater functionality...____ > > > > > > __ __ > > > > > > I remain open minded to the possibilities____ > > > > > > __ __ > > > > > > Simon.____ > > > > > > __ __ > > > > > > On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se... > > <mailto:se...@se...> > > > <mailto:se...@se... <mailto:se...@se...>>> > wrote:____ > > > > > > Hi Simon____ > > > > > > ____ > > > > > > I’m sure you can model a helicopter using FGPropeller etc. as > a > > > basis, but I would imagine it would be a 1^st order > approximation > > > since there are a number of dynamics that FGPropeller doesn’t > > model > > > compared to FGRotor, so FGRotor would more easily allow for a > > higher > > > fidelity model.____ > > > > > > ____ > > > > > > Cheers____ > > > > > > ____ > > > > > > *From:* Simon Julie Morley via Jsbsim-devel > > > <jsb...@li... > > <mailto:jsb...@li...> > > > <mailto:jsb...@li... > > <mailto:jsb...@li...>>> > > > *Sent:* Sunday, October 25, 2020 11:59 PM > > > *To:* Development issues <jsb...@li... > > <mailto:jsb...@li...> > > > <mailto:jsb...@li... > > <mailto:jsb...@li...>>> > > > *Cc:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...> > > > <mailto:sim...@go... > > <mailto:sim...@go...>>> > > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > > > ____ > > > > > > Hi Sean, ____ > > > > > > ____ > > > > > > To be honest I wanted to try and see if I could make a > helicopter > > > using the prop code, because I couldn't see why not.____ > > > > > > ____ > > > > > > On Sun, 25 Oct 2020 at 21:12, Sean McLeod > > <se...@se... <mailto:se...@se...> > > > <mailto:se...@se... <mailto:se...@se...>>> > > wrote:____ > > > > > > Hi Simon____ > > > > > > ____ > > > > > > I’m just getting started again in terms of looking at > JSBSim > > > based helicopter models.____ > > > > > > ____ > > > > > > Thomas Kreitler improved the FGRotor model between 2010 – > > 2012.____ > > > > > > ____ > > > > > > > > > https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp____ > > > > > > ____ > > > > > > He also added a fairly detailed helicopter model for the > > AH1S:____ > > > > > > ____ > > > > > > > > > https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s____ > > > > > > ____ > > > > > > In general there are very few JSBSim based helicopter > models > > > around when I last looked.____ > > > > > > ____ > > > > > > Cheers____ > > > > > > ____ > > > > > > *From:* Bill Galbraith <bil...@gm... > > <mailto:bil...@gm...> > > > <mailto:bil...@gm... > > <mailto:bil...@gm...>>> > > > *Sent:* Sunday, October 25, 2020 8:08 PM > > > *To:* 'Development issues' > > <jsb...@li... > > <mailto:jsb...@li...> > > > <mailto:jsb...@li... > > <mailto:jsb...@li...>>> > > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > > > ____ > > > > > > Simon,____ > > > > > > ____ > > > > > > I had devoted some brain cells towards that idea a while > ago, > > > but never implemented it.____ > > > > > > ____ > > > > > > Imagine a point mass, with a point vertical force located > > above > > > it. At 50% collective, vertical force equals weight. > Cyclic > > > tilts that vertical force fore/aft, left/right. > > Displacing the > > > cyclic yields a slight loss (sine of angle) loss of lift, > > > requiring slightly more collective.____ > > > > > > ____ > > > > > > The painful part comes when you try to fly it with a > > joystick. > > > When you release the joystick, the cyclic returns back to > > > neutral, the aircraft will slow to a hover. You basically > > need a > > > joystick that has a trim lever, or allows you to > > reestablish the > > > trim point.____ > > > > > > ____ > > > > > > Enough to get your brain cells excited?____ > > > > > > ____ > > > > > > Bill____ > > > > > > ____ > > > > > > *From:* Simon Julie Morley via Jsbsim-devel > > > [mailto:jsb...@li... > > <mailto:jsb...@li...>] > > > *Sent:* Sunday, October 25, 2020 1:41 PM > > > *To:* Development issues > > <Jsb...@li... > > <mailto:Jsb...@li...> > > > <mailto:Jsb...@li... > > <mailto:Jsb...@li...>>> > > > *Cc:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...> > > > <mailto:sim...@go... > > <mailto:sim...@go...>>> > > > *Subject:* [Jsbsim-devel] Helicopter____ > > > > > > ____ > > > > > > Anyone here ever done one ?____ > > > > > > ____ > > > > > > Want to talk about it, share knowledge ?____ > > > > > > ____ > > > > > > Simon____ > > > > > > ____ > > > > > > ____ > > > > > > ____ > > > > > > _______________________________________________ > > > Jsbsim-devel mailing list > > > Jsb...@li... > > <mailto:Jsb...@li...> > > > <mailto:Jsb...@li... > > <mailto:Jsb...@li...>> > > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > > _______________________________________________ > > > The JSBSim Flight Dynamics Model project > > > http://www.JSBSim.org > > > ___________________________________________________ > > > > > > > > > > > > > > > > > > _______________________________________________ > > > Jsbsim-devel mailing list > > > Jsb...@li... > > <mailto:Jsb...@li...> > > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > > _______________________________________________ > > > The JSBSim Flight Dynamics Model project > > > http://www.JSBSim.org > > > _______________________________________________ > > > > > > > -- > > Thomas Kreitler - Information Retrieval > > kre...@mo... <mailto:kre...@mo...> > > 49/30/8413 1702 > > > > -- > Thomas Kreitler - Information Retrieval > kre...@mo... > 49/30/8413 1702 > |
|
From: Thomas <kre...@mo...> - 2020-10-27 00:57:13
|
Hi Simon, sorry now for quoting into your response. Simon Julie Morley wrote: > No offense intended, it's not like I'm critising jsbsim as I'm using it. IMHO, youre welcome > > I chose to attempt to model a helicopter by adapting the propeller > code.... I shouldn't be critised for doing this. Well, call/interpretate the critism just as 'questions' about your intention, or simply as advice (you are trying something new, or?), since I guess the people in this forum all have their individual 'zugang' to jsbsim. > > This is my hobby, if you feel me doing something is a personal insult > and that we shouldn't talk about it, and that I shouldn't answer > questions raised to me then I'm at a loss as to the point of this forum.. No, again, feel free to exercise jsbsim -- but what's wrong about explaining what you like to do? My answer was a respose to your statement. Should I accept it, or should I pose a question? Alternatively, this could be a starting point for a discussion... Thomas > > Simon > > On Mon, 26 Oct 2020, 22:47 Thomas, <kre...@mo... > <mailto:kre...@mo...>> wrote: > > Hello Simon, > > I'm a bit offended by your claim -- CIT: 'there's nothing in it I can't > do with a propeller'. > > Allow me one question: how do you intend to treat the tail-rotor? > > Anyway, I'm curious about your results. 'think that the propeller is > better suited to model mid-size quad-drones and the like. > > Kind Regards, > > Thomas > > P.S. As for the rotor-model, two pointers for reading: > > /br/ > https://www.elsevier.com/books/bramwells-helicopter-dynamics/bramwell/978-0-08-097404-0 > > /sh/ Shaugnessy, J. D., Deaux, Thomas N., and Yenni, Kenneth R., > "Development and Validation of a Piloted Simulation of a Helicopter and > External Sling Load", NASA TP-1285, 1979 > > > Simon Julie Morley via Jsbsim-devel wrote: > > > > yeh I have, and there's nothing in it I can't do with a propeller, > > and actually there are things in the propeller code that the > rotor can't > > do.... so using rotor is a net less... > > > > Simon > > > > ---------- Forwarded message --------- > > From: *Sean McLeod* <se...@se... > <mailto:se...@se...> <mailto:se...@se... > <mailto:se...@se...>>> > > Date: Mon, 26 Oct 2020 at 20:00 > > Subject: RE: [Jsbsim-devel] Helicopter > > To: Simon Julie Morley <sim...@go... > <mailto:sim...@go...> > > <mailto:sim...@go... > <mailto:sim...@go...>>> > > > > > > Hi Simon____ > > > > __ __ > > > > Have you looked at the FGRotor code to see what helicopter specific > > stuff it models that isn’t modeled by FGPropeller?____ > > > > __ __ > > > > Cheers____ > > > > __ __ > > > > *From:* Simon Julie Morley <sim...@go... > <mailto:sim...@go...> > > <mailto:sim...@go... > <mailto:sim...@go...>>> > > *Sent:* Monday, October 26, 2020 5:19 PM > > *To:* Sean McLeod <se...@se... > <mailto:se...@se...> <mailto:se...@se... > <mailto:se...@se...>>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > __ __ > > > > Hi Sean,____ > > > > __ __ > > > > I'm not sure about using prop resulting in a lesser quality or that > > rotor offering greater functionality...____ > > > > __ __ > > > > I remain open minded to the possibilities____ > > > > __ __ > > > > Simon.____ > > > > __ __ > > > > On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se... > <mailto:se...@se...> > > <mailto:se...@se... <mailto:se...@se...>>> wrote:____ > > > > Hi Simon____ > > > > ____ > > > > I’m sure you can model a helicopter using FGPropeller etc. as a > > basis, but I would imagine it would be a 1^st order approximation > > since there are a number of dynamics that FGPropeller doesn’t > model > > compared to FGRotor, so FGRotor would more easily allow for a > higher > > fidelity model.____ > > > > ____ > > > > Cheers____ > > > > ____ > > > > *From:* Simon Julie Morley via Jsbsim-devel > > <jsb...@li... > <mailto:jsb...@li...> > > <mailto:jsb...@li... > <mailto:jsb...@li...>>> > > *Sent:* Sunday, October 25, 2020 11:59 PM > > *To:* Development issues <jsb...@li... > <mailto:jsb...@li...> > > <mailto:jsb...@li... > <mailto:jsb...@li...>>> > > *Cc:* Simon Julie Morley <sim...@go... > <mailto:sim...@go...> > > <mailto:sim...@go... > <mailto:sim...@go...>>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Hi Sean, ____ > > > > ____ > > > > To be honest I wanted to try and see if I could make a helicopter > > using the prop code, because I couldn't see why not.____ > > > > ____ > > > > On Sun, 25 Oct 2020 at 21:12, Sean McLeod > <se...@se... <mailto:se...@se...> > > <mailto:se...@se... <mailto:se...@se...>>> > wrote:____ > > > > Hi Simon____ > > > > ____ > > > > I’m just getting started again in terms of looking at JSBSim > > based helicopter models.____ > > > > ____ > > > > Thomas Kreitler improved the FGRotor model between 2010 – > 2012.____ > > > > ____ > > > > > https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp____ > > > > ____ > > > > He also added a fairly detailed helicopter model for the > AH1S:____ > > > > ____ > > > > > https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s____ > > > > ____ > > > > In general there are very few JSBSim based helicopter models > > around when I last looked.____ > > > > ____ > > > > Cheers____ > > > > ____ > > > > *From:* Bill Galbraith <bil...@gm... > <mailto:bil...@gm...> > > <mailto:bil...@gm... > <mailto:bil...@gm...>>> > > *Sent:* Sunday, October 25, 2020 8:08 PM > > *To:* 'Development issues' > <jsb...@li... > <mailto:jsb...@li...> > > <mailto:jsb...@li... > <mailto:jsb...@li...>>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Simon,____ > > > > ____ > > > > I had devoted some brain cells towards that idea a while ago, > > but never implemented it.____ > > > > ____ > > > > Imagine a point mass, with a point vertical force located > above > > it. At 50% collective, vertical force equals weight. Cyclic > > tilts that vertical force fore/aft, left/right. > Displacing the > > cyclic yields a slight loss (sine of angle) loss of lift, > > requiring slightly more collective.____ > > > > ____ > > > > The painful part comes when you try to fly it with a > joystick. > > When you release the joystick, the cyclic returns back to > > neutral, the aircraft will slow to a hover. You basically > need a > > joystick that has a trim lever, or allows you to > reestablish the > > trim point.____ > > > > ____ > > > > Enough to get your brain cells excited?____ > > > > ____ > > > > Bill____ > > > > ____ > > > > *From:* Simon Julie Morley via Jsbsim-devel > > [mailto:jsb...@li... > <mailto:jsb...@li...>] > > *Sent:* Sunday, October 25, 2020 1:41 PM > > *To:* Development issues > <Jsb...@li... > <mailto:Jsb...@li...> > > <mailto:Jsb...@li... > <mailto:Jsb...@li...>>> > > *Cc:* Simon Julie Morley <sim...@go... > <mailto:sim...@go...> > > <mailto:sim...@go... > <mailto:sim...@go...>>> > > *Subject:* [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Anyone here ever done one ?____ > > > > ____ > > > > Want to talk about it, share knowledge ?____ > > > > ____ > > > > Simon____ > > > > ____ > > > > ____ > > > > ____ > > > > _______________________________________________ > > Jsbsim-devel mailing list > > Jsb...@li... > <mailto:Jsb...@li...> > > <mailto:Jsb...@li... > <mailto:Jsb...@li...>> > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > _______________________________________________ > > The JSBSim Flight Dynamics Model project > > http://www.JSBSim.org > > ___________________________________________________ > > > > > > > > > > > > _______________________________________________ > > Jsbsim-devel mailing list > > Jsb...@li... > <mailto:Jsb...@li...> > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > _______________________________________________ > > The JSBSim Flight Dynamics Model project > > http://www.JSBSim.org > > _______________________________________________ > > > > -- > Thomas Kreitler - Information Retrieval > kre...@mo... <mailto:kre...@mo...> > 49/30/8413 1702 > -- Thomas Kreitler - Information Retrieval kre...@mo... 49/30/8413 1702 |
|
From: Simon J. M. <sim...@go...> - 2020-10-26 23:45:48
|
No offense intended, it's not like I'm critising jsbsim as I'm using it. I chose to attempt to model a helicopter by adapting the propeller code.... I shouldn't be critised for doing this. This is my hobby, if you feel me doing something is a personal insult and that we shouldn't talk about it, and that I shouldn't answer questions raised to me then I'm at a loss as to the point of this forum.. Simon On Mon, 26 Oct 2020, 22:47 Thomas, <kre...@mo...> wrote: > Hello Simon, > > I'm a bit offended by your claim -- CIT: 'there's nothing in it I can't > do with a propeller'. > > Allow me one question: how do you intend to treat the tail-rotor? > > Anyway, I'm curious about your results. 'think that the propeller is > better suited to model mid-size quad-drones and the like. > > Kind Regards, > > Thomas > > P.S. As for the rotor-model, two pointers for reading: > > /br/ > > https://www.elsevier.com/books/bramwells-helicopter-dynamics/bramwell/978-0-08-097404-0 > > /sh/ Shaugnessy, J. D., Deaux, Thomas N., and Yenni, Kenneth R., > "Development and Validation of a Piloted Simulation of a Helicopter and > External Sling Load", NASA TP-1285, 1979 > > > Simon Julie Morley via Jsbsim-devel wrote: > > > > yeh I have, and there's nothing in it I can't do with a propeller, > > and actually there are things in the propeller code that the rotor can't > > do.... so using rotor is a net less... > > > > Simon > > > > ---------- Forwarded message --------- > > From: *Sean McLeod* <se...@se... <mailto:se...@se...>> > > Date: Mon, 26 Oct 2020 at 20:00 > > Subject: RE: [Jsbsim-devel] Helicopter > > To: Simon Julie Morley <sim...@go... > > <mailto:sim...@go...>> > > > > > > Hi Simon____ > > > > __ __ > > > > Have you looked at the FGRotor code to see what helicopter specific > > stuff it models that isn’t modeled by FGPropeller?____ > > > > __ __ > > > > Cheers____ > > > > __ __ > > > > *From:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...>> > > *Sent:* Monday, October 26, 2020 5:19 PM > > *To:* Sean McLeod <se...@se... <mailto:se...@se...>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > __ __ > > > > Hi Sean,____ > > > > __ __ > > > > I'm not sure about using prop resulting in a lesser quality or that > > rotor offering greater functionality...____ > > > > __ __ > > > > I remain open minded to the possibilities____ > > > > __ __ > > > > Simon.____ > > > > __ __ > > > > On Mon, 26 Oct 2020, 13:08 Sean McLeod, <se...@se... > > <mailto:se...@se...>> wrote:____ > > > > Hi Simon____ > > > > ____ > > > > I’m sure you can model a helicopter using FGPropeller etc. as a > > basis, but I would imagine it would be a 1^st order approximation > > since there are a number of dynamics that FGPropeller doesn’t model > > compared to FGRotor, so FGRotor would more easily allow for a higher > > fidelity model.____ > > > > ____ > > > > Cheers____ > > > > ____ > > > > *From:* Simon Julie Morley via Jsbsim-devel > > <jsb...@li... > > <mailto:jsb...@li...>> > > *Sent:* Sunday, October 25, 2020 11:59 PM > > *To:* Development issues <jsb...@li... > > <mailto:jsb...@li...>> > > *Cc:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Hi Sean, ____ > > > > ____ > > > > To be honest I wanted to try and see if I could make a helicopter > > using the prop code, because I couldn't see why not.____ > > > > ____ > > > > On Sun, 25 Oct 2020 at 21:12, Sean McLeod <se...@se... > > <mailto:se...@se...>> wrote:____ > > > > Hi Simon____ > > > > ____ > > > > I’m just getting started again in terms of looking at JSBSim > > based helicopter models.____ > > > > ____ > > > > Thomas Kreitler improved the FGRotor model between 2010 – > 2012.____ > > > > ____ > > > > > https://github.com/JSBSim-Team/jsbsim/blob/4840a621dafe1ce64970990ddaec3e86a1c7e082/src/models/propulsion/FGRotor.cpp____ > > > > ____ > > > > He also added a fairly detailed helicopter model for the > AH1S:____ > > > > ____ > > > > > https://github.com/JSBSim-Team/jsbsim/tree/4840a621dafe1ce64970990ddaec3e86a1c7e082/aircraft/ah1s____ > > > > ____ > > > > In general there are very few JSBSim based helicopter models > > around when I last looked.____ > > > > ____ > > > > Cheers____ > > > > ____ > > > > *From:* Bill Galbraith <bil...@gm... > > <mailto:bil...@gm...>> > > *Sent:* Sunday, October 25, 2020 8:08 PM > > *To:* 'Development issues' <jsb...@li... > > <mailto:jsb...@li...>> > > *Subject:* Re: [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Simon,____ > > > > ____ > > > > I had devoted some brain cells towards that idea a while ago, > > but never implemented it.____ > > > > ____ > > > > Imagine a point mass, with a point vertical force located above > > it. At 50% collective, vertical force equals weight. Cyclic > > tilts that vertical force fore/aft, left/right. Displacing the > > cyclic yields a slight loss (sine of angle) loss of lift, > > requiring slightly more collective.____ > > > > ____ > > > > The painful part comes when you try to fly it with a joystick. > > When you release the joystick, the cyclic returns back to > > neutral, the aircraft will slow to a hover. You basically need a > > joystick that has a trim lever, or allows you to reestablish the > > trim point.____ > > > > ____ > > > > Enough to get your brain cells excited?____ > > > > ____ > > > > Bill____ > > > > ____ > > > > *From:* Simon Julie Morley via Jsbsim-devel > > [mailto:jsb...@li...] > > *Sent:* Sunday, October 25, 2020 1:41 PM > > *To:* Development issues <Jsb...@li... > > <mailto:Jsb...@li...>> > > *Cc:* Simon Julie Morley <sim...@go... > > <mailto:sim...@go...>> > > *Subject:* [Jsbsim-devel] Helicopter____ > > > > ____ > > > > Anyone here ever done one ?____ > > > > ____ > > > > Want to talk about it, share knowledge ?____ > > > > ____ > > > > Simon____ > > > > ____ > > > > ____ > > > > ____ > > > > _______________________________________________ > > Jsbsim-devel mailing list > > Jsb...@li... > > <mailto:Jsb...@li...> > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > _______________________________________________ > > The JSBSim Flight Dynamics Model project > > http://www.JSBSim.org > > ___________________________________________________ > > > > > > > > > > > > _______________________________________________ > > Jsbsim-devel mailing list > > Jsb...@li... > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > _______________________________________________ > > The JSBSim Flight Dynamics Model project > > http://www.JSBSim.org > > _______________________________________________ > > > > -- > Thomas Kreitler - Information Retrieval > kre...@mo... > 49/30/8413 1702 > |
443 messages has been excluded from this view by a project administrator.
