Master Airscrew has a few 3 blade pusher props. I have one with a 90 2-stroke and I'm running a 11 x 7
3-blade on it. I just finished the plane but have not had it in the air yet. I have run the engine and was hitting
just under 12,000 rpm. with this set up. Master Airscrew has 12 x 6, 13 x 8, and 14 x 7 3-blade but I don't
think you'll get the 13 x 8 on the plane with out hitting the tail.