When I selected a prop for my boat, I first determined what maximum diameter I could use that would give me about a two inch clearance from the tip of the prop to the hull bottom. Then I selected a pitch that would allow the engine to run at max (or close to max) rated RPM while motoring underway at full throttle. If you can run the engine higher than max rated RPM, your prop is under-pitched. If you can't reach max rated RPM, you are over-pitched. An over-pitched prop puts too much stress on the engine. An under-pitched prop won't damage the engine as long as you don't run it past max rated RPM (80% is ideal), but you won't get maximum speed from your boat.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR _______________________________________________ CnC-List mailing list CnC-List@cnc-list.com http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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