I got 9000 on a Zinger Pro 18x8, Dynathust 18x8, and a MA scimitar 18x10:thumbdown, 8500 on a Zinger 18x8, 6600 on a MA wood 20x8 and 7500 on the MA cut down to 19x8. The cut prop seemed to pull the best, the others just seemed to make a lot of noise and the 20" was too slow. Running a Perry pump on 3% nitro and 12% oil at about 200' elev. Bisson pitts with the tips cut off.