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Old 12-18-2007
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Is there an equation for that? I would think it would have too many variables, including: Prop, hull design, how clean the hull is, current, wind, etc.

I have always thought a general rule of thumb is 2 HP for every 1000 lbs. The Catalina 380 weighs about 20k and has a 40hp engine. The 400 weigs about 24000 and has a 54 hp. I would err on the high side.

However, there are so many factors, it would seem impossible to calculate to me. Maybe some naval architects could give you a better rule of thumb than mine.

- CD
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