Well I finally had a calm day and a chance to get the flatty to fly. I got 65.1 MPH at 4500 RPM's. I'm running a 12 degree shaft with 15 gears spinning a 12/16 3 blade. When I was running a 12/14 3 blader, I got 50 at 5000. Is it possible to get more out of her? Change prop, cut prop down, decrease pitch, etc? I'm not looking for a speed record or anything,,,,,,,just want to beat my son's wacker boat (72MPH).