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post #6 of Old 07-20-2011
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Originally Posted by shogan50 View Post
Roughly speaking power should be proportional to square of speed up to hull speed, which is close to 6.4 kts on my boat.
Actually, the power requirement goes up by the cube of speed as long as you are well below hull speed. At low speeds, frictional resistance is most important. As you approach hull speed, wave making resistance becomes most significant.
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