RE: Sundowner 50: MAgnum .70
There's a Revolver thread in the ARF forum, and one of the guys has a saito .82 turning a 13x8 APC and he radar'd his plane at 113mph on the flat. Confirmed by doppler/video. That's about 40% faster than the theoretical pitch speed. I say put an 8 pitch prop on that thing that will give you 9500-10000 rpm on the groung and go fly.