This motor glider can go over 80.000 (!) ft using only 0.9L of fuel.
Obviously this thing can't fly without the gyro and is propably some kind of "bugusing", but it works ;).
How to:
When making the 10.000ft challange, you have to make a steep climb, to avoid hitting the tower of the aircraft carrier. Try to climb as high as possible before running out of fuel. With 1500ft altitude you should be able to glide about 80.000ft. When fuel is empty, destroy the heavy engine by changing the VTOL bar to the very minumum. It will explode.
Then Reduce speed to about 50mph and leave all controls 0.
Don't to anything! Just let it glide. It will take quite a while (10 minutes+). When it reaches about 10ft above water, decrease the speed further untill it stalls.

Thanks for downloading :)

Edit: It has basically no direction control...