Re: [Jsbsim-users] Taildragger control on ground.

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

Hi Alan

With regards to small winds on the ground with a large cross-wind angle and it's interaction with the aerodynamic forces plus issues with the gear and ground reactions take a look at the following issue:

https://github.com/JSBSim-Team/jsbsim/issues/89

Cheers

-----Original Message-----
From: Alan Teeder <ajt...@v-...> 
Sent: Sunday, June 2, 2019 9:44 AM
To: Ron Jensen <ro...@je...>; JSBSim user questions <jsb...@li...>
Subject: Re: [Jsbsim-users] Taildragger control on ground.


On 01/06/2019 13:05, Ron Jensen wrote:
> Alan,
>
> If you're in FlightGear and have wind, you should be using sin(alpha) 
> and
> sin(beta) instead of using the raw values in your aerodynamics 
> sections, otherwise even small winds can build up unrealistically 
> large aerodynamic forces.
>
> Ron

-------------

Rin

I am doing this testing with zero wind and will only add cross-winds when I can control the aircraft.

I like the idea of using cos(beta) so that beta effects are smoothly limited.  I believe that  the main gear side forces and the resultant yaw motion is unstable , and these are running away. With  taildragger these forces are in front of the CG.

Alan




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