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Re: [Jsbsim-devel] Fwd: Helicopter
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From: Thomas <kre...@mo...> - 2020-10-26 23:12:27
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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 isnt 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____ > > ____ > > Im 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 doesnt 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____ > > ____ > > Im 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 |
