Not a clue, my C27 (85) came with a martex, I have not had any problems. I don't race enough to really be able to tell the difference. Biggest issue is how much you motor. I max out at about 10 minutes, unless going into storage. The three blade is a good thing if you have a lot of motoring. I realize this is virtually no help, I could measure the prop if you can wait a few days.