I just purchased the Alpha 60 ARF, haven't flown it yet, it's just about ready. Everything I've read about the included prop, says it's for beginners. It loads the engine to slow the plane. Gives better stability at slow speeds and landings.

I have a slight problem though. I installed the OS .61FX. When I put the (ARF included "Evolution") spinner backing plate, prop and (OS included) washer and the nut, only a little better than half the nut grabs thread. Are Evolution shafts longer than OS?

I've purchase a 2 blade prop "Master Airscrew" and a "Dubro" spinner, combined they seem to be a little thinner than the Evolution blade and spinner. The OS owners manual recommends a 12-6, 12-8 or 13-6 prop. On the Alpha 60, with the OS .61FX, which prop would work best?

Will running the trainer prop (without having a full nut, as long as it's tight) be ok in the beginning? If it helps beginners, I need all the help I can get.......