Mine has an OS 48 Surpass four stroke mounted inverted. Perfect. Use about half to 2/3 throttle for scale like takeoff, and cruise around on less than half throttle if you want. Plenty of power if you want to hoon around a bit, but not the "unlimited vertical" that everyone seems to want these days.

I have towed gliders with the 48 no problem.

Great model, good luck

Dave H