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Old 08-19-2008
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Zanshin Zanshin is offline
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The LWL of the Beneteau 40 is 33 11/12 feet, so your hull speed is 7.8 knots.

You are probably getting a lot of drag off the hull and perhaps even cavitation from the prop. You should be getting more RPM and speed from the engine but that could be due to the dirty hull. More importantly, clean and smooth the prop.
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