Re: Prop Pitch & Diameter
Going to the "great deal" props with 2" less pitch, but 3/8" greater diameter should be similar to same diameter, but only 1" less pitch. You should gain an extra 100-200 max rpms, roughly speaking. But then blade shape, rake and progression all play a role as well. Try it and see.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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