I had a patriot with an os46fx plenty of motor ran a 10/7 apc on it dont know the rpm but it flew great. With retracts you could get to 80+ mph on the straight line. I have seen this same plane with retracts and a jett 50 with 10/7 apc prop doing over 120mph verified with a radar gun. have fun but don't take your eye off it. I lost mine when I lost the muffler on a down wind turn low from the ground. have fun