Re: [Jsbsim-devel] Helicopter

[Sean M. <se...@se...>]

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...<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
_______________________________________________