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Old 10-22-2002
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Displaced weight vs Dry Weight

On another email list there is a lively discussion on whether a sailboat dry weight (measured by crane) should be the same as the advertised displacement of the boat.

Some say that the crane weight is not accurate because it measures tons and because of some extra gear used in lifting that was not accurately reflected in measurement. Others say that the advertised displaced weight is usually optomistic or just wrong.

Well the discussion then got theoretical. So the qwuestion is this....

Is the weight of a boat dry supposed to be the same as that of the water it displaces? Ie. If we took a boat and measured teh weight of the water it displaced and then measured the dry weight of the same boat should they be the same.

Please explain why or why not.

I suspect most of the reason is that the designers come up with the displacement and THEN the builders build the boat and it might not behave exactly as forseen.

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