RE: little toni
Well I'm doing an electric setup in my GP minnow. My ultimate goal is about 3.5kw on 13S lipo and 14x14 prop this should yield about 10,700rpm and just over 140mph pitch speed. I'll probably start it off on a 12x12 and see how the airframe responds if it needs more prop to match pitch speed or not. This falls into one of those weird rpm/load ranges where the smaller higher revving IC motors lack the power to to spin a 14x14 that fast yet the bigger high power motors don't spin that fast.
From what I have read something like a OS120ax with a pipe will turn a 14x12 somewhere around 10,000 which is only 113mph pitch speed. A regular 120ax will turn a 13x13 somewhere around 10,000rpm which is about ~123 pitch speed.