By Jim Martenhoff
Most boatmen understand that propeller pitch determines their boat’s performance. Too little pitch and the prop spins wastefully on an over-revving engine. Too much and the wheel (prop) slows down as the engine labors valiantly to drive it. You can play around with props on a trial-and-error basis, trying to find one that will match your boat’s hull shape, weight, and engine output. But that’s time-consuming and can be costly unless a dealer will lend you props to experiment with. Using two simple rules of thumb I’ve developed over many years, you can do the experimenting on paper with simple arithmetic .
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