I had a OS .46 FX on this plane with an 11 x 6 prop. And it was too much power for my flying style. But I tamed it down some by using an 11 x 4 prop. I was going to put an 11 x 3 and then an 12.25 x 3.75 on it and give those combinations a try. But I sold the plane. The Lt40 costs more but it is in my opinion a much better trainer.

Todd