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Hi Lou:How much money do you have? If you were a racer, you would want to look at a folding prop. If you have too much money you should look at a feathering prop. If you want to sail slower you should look at a three blade prop. If you're cheap like me you should call Kilians in San Leandro and see what they have to offer. You take them your prop and for $130 you will motor better, back straight and sail just as fast.