Just a little background here. Over the winter, I will be building and kitbashing a tower trainer 40. I plan to make it a taildragger, add flaps and use ailerons that are bigger. I also plan to set it up on my 7Cap so the flaps can be used as ailerons when not deployed as flaps.

My question is this: Can I use an os 61 fx on this size plane using a prop like a 13x4 as long as the plane balances on cg?