Does anyone have any practical experience with different rotor lengths used on the same gyro in an ultralight setup? I'm in the process of having an ultralight gyro built for me starting with a Bensen gyro airframe. The below seat mounted gas tank is being replaced with a seat tank and a Kawasaki 440 (43 hp) with a 3 blade prop is proposed. The rotor would be 21.5 feet as proposed but I'm concerned as to whether this will produce acceptable performance. From what I've read I think I would get better overall performance with lighter blade loading and a resulting slow rotor speed from longer rotors. btw - I'm the mythical 150lb pilot!