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post #140 of Old 03-14-2014
capt vimes
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Re: How do you feel about catamarans?

Originally Posted by pdqaltair View Post
You all are hysterical, correcting each other without actually looking up the answer.

a. The displacment of a boat in tons, using the kind of common sense definition you are using is ALWAYS the exact wieght. It could not be otherwise, and so it's simpler to just refer to the weight.

b. Displacement, as any sailor uses the term, refers to the maximum design weight, with slight differences in how folks define that. In priciple, a cruising boat should always be well under its rated displacement, except for the day it departs on passage. The difference between dry wieght and displacement is carrying capacity.
look - i know all that, but thank you...

what you very often find is the displacement given to the DWL (Design Waterline) which will be somewhere between light- (no loads, boat weight alone) and full displacement (heavy loaded to the maximum)
"Displ to DWL 4750kg (10470lb)" these figures are actually from a 40 foot plywood epoxy monohull for home built with 2000 kg ballast...
Didi 40cr radius chine plywood sailboat
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