FYI-In case anyone is interested in improving the performance of their fixed blade prop, you may want to contact these guys (Tim & Bob Kilian). They are the inventors of the Non-Slip Tip prop. The process takes you existing prop and the cut the tip of the blades and weld them back on a 90 degs. to form a winglet like some of the modern airplane wings. RTK Propeller Technologies LLC. 536 Lewelling Blvd.Unit I San Leandro,Ca 94579. Phone 510-357-3480Fax 510-357-3980