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On Mon, 25 Apr 2005 20:16:09 GMT, Albert P. Belle Isle
wrote: Our resting WL is 24'. To maintain a 1.34 constant and get the speeds we've verified while definitely not surfing, our effective waterline would have to be greater than 35'. That's a LONG way behind our transom! Jere - As a quick calculation, 24ft DWL would yield a hull speed of about 6.6kt with a speed-length coefficient of 1.34. To get to 7kt, the effective DWL at 1.34 would be a little over 27ft - not 35ft. My previous boat had a DWL of 28ft, for which a speed-length coefficient of 1.34 would predict 7.1kt. I easily got 7.4kt on beam reaches, which would say my real coefficient was almost 1.4 (or that my effective DWL at 1.34 was a little over 30ft - a two foot "push-back" of the sten wave, which was roughly how the peak of the stern wave looked from my cockpit. Regards, Al |
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