Hi

I have flown one with a 91FX 2-Stroke on it.... Good power for aerobatics, Although it hovers at about 85% throttle with a 15x4 APC. I have a 120AX on my WM Extra 330 same specs -- that bird really rocks. If you can try and put a 120AX on this model and you will have fun both pattern as well as 3D.

Cheers