A 10x6 prop on a ball-bearing 46 seems to rev real high but doesn't have a lot of umph. I usually use a 11x6 APC sport prop on my .46's. I do have a 10x7 on the GMS .47 on the Kadet Senior but I haven't flown it yet. Waiting for nice weather. There's been mention of using a 11x5 and I'd like to try that too.