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Go Back   SailNet Community > Skills and Seamanship > Learning to Sail
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Old 04-06-2004
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speed question

what is the max sailing speed of something like a cal 34?
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Old 04-06-2004
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speed question

For displacement hulls, the formula is:
Boat speed (in knots) = 1.34 x (the square root of the boat''s waterline length [in feet]).

For a boat with a waterline length of exactly 25'', the speed would be 1.34 x 5, which is 6.7 knots. The speed for a boat with a 36'' waterline would be 1.34 x 6 = 8.04 knots.

I guess the Cal 34 has a waterline of about 28'', so its speed should be about 7 knots.

~ Happy sails to you ~ _/) ~
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Old 04-06-2004
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speed question

That is not an easy question to answer. Surfing a boat like a Cal 34 might hit 9-10 knots of even higher for a few seconds. That would be thier maximum speed. The previous answer addressed hull speed which is a theoretical limit on speed in the absense of of wave action (roughly 1.33 times the square root of the waterline length). That is really not very accurate number as a predictor of how fast any individual boat might actually be. Modern boats tend to easily exceed their hull speed while older designs tend to spend a substantial portion of time well below their hull speeds.

Jeff
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