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I bought a Tom W Clark recommended stainless propeller for my boat and am looking forward to using it (1979 22 foot Revenge soon to being powered by 200hp HO E-tec). I trust Tom's opinion. Some local fellows here prefer to run aluminum propellers saying that when hitting an obstruction, the aluminum would break and not damage the internals of the outboard. Is this true or an old wife's tale? Lawn mowers have an aluminum shear key to protect the motor. Do any outboards have a "shear key"? What is the percentage of advantage of the s.s vs. aluminum for performance.
gchuba