I was told to get intouch with U TimChick in order to find out some ? on the Mac 90 hp engine/ PROP. I need some Pictures of it's size, and PiITCH, if U could help me. I need a measurment from the tip- 6" in wards to wards the center, then put your tape measure across the blade and let me know what it saids. I am getting one built by a prop builder, name Jay Anderson (Texas) (325) 356-2810, He was telling me about an FLEX type PROP which He could make for the 90 hp Mac engine. Cool hu? So I need measurements. If U want, call Jay and talk to him. Thanks. Keep on flying.