The theoretical hull speed of a Catalina 25' with only the jib up in winds around 20 kts. is what? About 4 - 5 knots?...
The theoretical hull speed for a Catalina 25' with both sails up should be somewhere around 6.5 knots, which is slightly faster then my 27 footer which has a slightly smaller LWL then the C25....
One point: theoretical hull speed is just the speed at which the wavelength of the wave (bow wave) produced by the hull is the same as the LWL of the hull. The attached pic is of a Catalina 25 is at, or just shy of, hull speed (note the bow wave). It doesn't matter if you have zero, one, two, or more sails up; hull speed is hull speed. Given enough wind a Catalina 25 could be pushed to or slightly beyond hull speed with just the jib up.
Could a Catalina 25 go much faster than hull speed? Maybe, in short spurts. (OK, that's two points.) They aren't very heavy boats, and the bottom is fairly
flattish. But I think that you're right about the current. I can't see a Cat25 keeping up that sort of speed for any length of time.
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Last edited by SlowButSteady; 02-29-2012 at 01:49 AM.