I had an old BUSA Phaeton biplane with an Enya 45SS. I put a 12x4 prop on it and loved it that way. Slows down better on the back side of a loop, and it lands easy because it slows down better. Keep up a bit of throttle till you're close to the ground, then cut the throttle and it drops right in for a three point. Speed level was still way more than I needed. I think you've got the right idea. Jim