Re: model flipping over on runway...

Le mercredi 11 mai 2005 à 23:37 +0200, Sam Heyman a écrit :
> Hi,
> 
> I am progressing well with the implementation of our UAV project "Manta" 
> and now have a fully flyable aircraft, with a nice .ac 3D model.
> Thanks to all of you who helped!
> 
> However I still have 2 questions:
> 1. When I start the flight on the runway the aircraft flips-over on its 
> back and starts to vibrate... any idea what that can be? it's strange 
> because once airborne it flies very nicely and is not offset.
> 
> 2. In order to have an operational landing gear for runway take-off, is 
> an undercarriage on the 3D model required? My feeling is that an FDM 
> undercarriage is enough... but I may be wrong.
> 
> Cheers! Sam
> 
> 
That problem is probably coming from the gears parameters damping and
spring constant. You have to search the best value, with several tests.
It have often that problem with new experimental models. 
The AC_GEAR values coming from Aeromatic needs to be tuned.
You don't need undercarriage on the 3D model.
Your model on runway look like a StarGate Glider without gear.   
-- 
Gerard


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