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Old 06-27-2012
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Re: Beneteau 36CC does not reach hull speed

I am a naval architect. Webb '82.

Hull speed isn't a real thing. When all hull forms were much the same there was an empirical relationship between waterline length and reasonable speed. Even so, it isn't a specific number. It is only an approximation of a point in the "knee of the curve" that shows the relationship between power and boat speed. Even there it ignores external effects like current and head winds.

5 knots on a 36 foot boat (31 foot waterline?) in an adverse current, headwind, and any sea at all is fine.

Empirical parameters like "hull speed" really aren't used much anymore as more deterministic modeling has become so inexpensively available.
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