Hi Jim.
I just ordered one of these myself. Still waiting for the package to arrive.
I plan to install a 40cc gas engine. I think it'll be ok, since it's supposed to accept gas engines in the 25cc-36cc range.
I could use the extra power since I want to submit this baby to some 3D thrashing (hope it's up to the job

).
The engine weighs 1300g plus ignition (which places it just below the 3 pound ballpark).
Now... I'm shopping for an appropriate prop for this engine.
I'd like to install something in the order of 21"-22" (the bigger the better).
But I'm having serious doubts regarding the available clearance.
Jim, do you think I can use a 22" prop in this plane?
Or would I risk doing some serious lawn mowing on the airfield?
Thanks in advance.
Cheers.