Limiting the Beam The International Offshore Rules require that the capsize screening value C (from the Exercise) be less than or equal to 2 for safety. What is the maximum allowable beam (to the nearest inch) for a boat with a displacement of 22,800 lbs? For a fixed displacement, is a boat more or less likely to capsize as its beam gets larger?
Exercise
Capsize Control The capsize screening value C is an indicator of a sailboat’s suitability for extended offshore sailing. C is determined by the formula
C = 4D−1/3B,
where D is the displacement of the boat in pounds and B is its beam (or width) in feet. Sketch the graph of this equation for B ranging from 0 to 20 ft assuming that D is fixed at 22,800 lbs. Find C for the Island Packet 40, which has a displacement of 22,800 pounds and a beam of 12 ft 11 in. (Island Packet Yachts, www.ipy.com).
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