ORIGINAL: ArcticCatRider
I hate to say so...but I don't care what that manual says, or what Bax says...a 14x8 is too big a prop for a .75
A 12x7 or a 13x6 is a much more appropriate prop. In fact, a 14x8 is even asking a lot for a .75 4-stroke.
Let me echo what he said above...
A 14x8 on a .75 is WAAY too much.
I fly my .75's with a 12x7 on 9lb planes... e.g. a Big Stik 60 and I am QUITE pleased with the performance.