I am flying a P.W.300 Extra with a Fuji 50 engine and swinging a 20-10 prop and it flys great but I am wondering if I would get better prefromance if I went to a 21 or 22-8 prop. I have been flying for about 50 years but I don't know that much about props. You can spend a lot of money on big props trying to get the preformance you would like. I would appreciate if some one could help.

Thank you, RFraz

I have a friend that has a 22 x 8 on his fuji 50 and it too much prop. No vertical

Thanks, I'll try a 20-8 and see what happens

Larger diameter will give better vertical, higher pitch will increase speed. Increase diameter and you have to lower the pitch (for the same RPM's). Increase pitch and you should lower the diameter.
Dennis-