[QUOTE=capt vimes;1624962]it is OK...
you have proven your "knowledge" - thank you!
i suggest that you should do some homework in physics...
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.