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

Waterplane area.
the area of a horizontal slice through the hull at water level.If you have a reasonably typical boat, you can approximate the waterplane area by multiplying waterline length in feet (or meters) by waterline beam, and then multiplying the result by 0.76. With the waterplane area, you can calculate how much of a load will put your boat down an inch (or a centimeter) on her marks.
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.

 
 
 

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