I'm going to start out with a 20-8 on my Fox 3.2 and tach it real quick.

Keep in mind that I'm at almost 5000'.

I just got an NX 21-8. I also have APC 22-8, 3W 22-8, 3W 21-10. Menz S 20-10, Menz S 21-8, Menz S 22-8, Menz Ultra 21-10, and MSC in 22-8 and 20-10.

It's just a matter of finding the prop that will let it unload too the proper RPM range and then find the one that pulls the way you want.

I'm shooting for MINIMUM 7000RPM on this engine. Plane is a 1/3 Pitts, so I'm not looking for a lot of speed--which is why I don't have any 12" pitch props in my shop. I'm looking for normal speed and good vertical. Probably end up with a 21" prop with either an 8 or 10 pitch.

Ya just gotta experiment.