Menu
▾
▴
[Jsbsim-devel] Fwd: Helicopter
|
From: Simon J. M. <sim...@go...> - 2020-10-26 20:09:31
|
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 _______________________________________________ |
