RE: Prop size
After reading this whole thread I must say that the APC 10.5x6 is the perfect prop.
Good power good speed and it allows the engine to rev. up quickly when power is needed NOW.
I have an evolution .46 on my Avistar and have tried all of the props mentioned and the 10.5x6 is the best of the bunch.
No Brag just Fact.
Ralph