model flipping over on runway...

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




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