Boating Encyclopedia:
Waterplane Area
Working out how much weight will sink her how many inches
There are several interesting calculations that start with a power- or sailboat’s waterplane area, which is
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pounds per inch immersion = waterplane area in square feet x 5.34 kilograms per centimeter immersion = waterplane area in square meters x 10.25For example, let’s say you have a 35-footer with a 28-foot waterline. Then:waterline length = 28 feet waterline beam = 10 feet, 10 inches approximate waterplane area = 28 x 10.83 x 0.76 = 230.46 square feet pounds per inch immersion = 230.46 x 5.34 = 1,231 pounds per inch immersed
See also Yacht Design.
