Ron, this is the prop I had on my JAE at Hobart it sure worked well there, Mark Shouland did this prop for Doc Turner and Doc was nice enough to let me use it an ABC 2718/3 V cut. 9.00" TE cup, 4.50 COB pitch, 64.01 mm dia. I did have Mark Shouland make another one with an additional inch of COB pitch 5.50 but the rod on my RCMK let go before I could do any testing.