Re: [Jsbsim-devel] Helicopter

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

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...]
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