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The Sail Area-Displacement ratio is a calculation used to express how much sail a boat carries relative to its weight.
In the first equation, the denominator in pounds is divided by 64 to convert it to cubic feet. The denominator is taken to the 2/3 power to make the entire metric unit-less.
It is an indicator of the performance of a boat. The higher the SA/D, the more lively the boat's sailing performance:
SA/D, however, doesn't provide information about a boat behavior in a storm or upwind. A polar diagram from a velocity prediction program gives a more precise view.
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