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post #4 of Old 01-09-2009
JohnRPollard's Avatar
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This is a tricky question -- so many variables. Length, displacement , rig, crew, windspeed, upwind, downwind, etc.

There's a fairly large speed difference between a typical 30 footer and the typical 40 footer. I would say Charlie's estimate is pretty high for a 30 footer, but in the ballpark for a well-crewed performance oriented 40 footer.

I'm wondering what you plan to use this average speed figure for? Is it for planning a passage? IF for that purpose, I would use a figure closer to 4.5 knots for the 30 footer and maybe 5.5 knots for the 40 footer.

If you are trying to compare the speeds of displacement vs. semi-planing hulls, that's another conversation. A bit more info, perhaps?

P.S. Welcome to Sailnet!

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Pacific Seacraft Crealock 31 #62

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