You want the maximum diameter that will still leave the tips of the prop about two inches away from the hull. The pitch is determined by how fast you can run the engine. With the right pitch, you should be able to run the engine at max rated rpm at full throttle. If you can run it higher than max rated rpm, your pitch is too low. If you can't reach max rated rpm at full throttle, your pitch is too high. If I read your question correctly, and you're thinking about installing an electric engine, good luck.
Alan Bergen C&C 35 Mk III Thirsty Rose City YC Portland, OR
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