I used a K&B 61 for a long time on this plane it was powerfull, but i also used a MVVS 49 it had less vertical power but the plane performed better in every way except straight up climbing. so i feel the 46 fx will make you happy. you need to make perfect landings wiith this plane or the landing gear block will collaps and damage the wing. you might try and reinforce the blocks before you assymble this plane.