I have one with two OS 26 four strokes. Enough power to fly without a problem but I wqouldn't use anything smaller. With these engines it would take quite a run if trying to take off from grass, especially if it is long. Paved runways are not a problem It will do large loops and roll without a problem. You don't say what engines you have in the plane. If you have 40 size rwo strokes you only get five or six minutes worth of flight because of the small fuel tanks so make sure to use a timer and keep the flight short. It does land better with two engiens running over one or none. Lastly it likes to land with some power because it is not a floater like a single engined high wing trainer. It has a high enough wing loading that it heads for the ground when the power is pulled off. Its an easy and fun plane to fly, have a good time.

Randy