by Ed Raymond

February 2004

For some time I had been concerned as to whether my yacht truly qualifies as a "Twelve Meter" racer. Since I assume that many of you have the same question in connection with your boats, I am offering for your convenience, the calculations used to make this determination:

The length of the hull at 180 millimeters above the water line is added to two times the difference between the skin girth and the chain girth at the 55 percent girth situation on both sides of the yacht. Those figures are then added to the square root of the sail area. The freeboard height of the hull above the water line is subtracted, and the figure is divided by the mathematical constant of 2.37. The number resulting from all that must equal twelve meters. If it does so, the boat is rated as a twelve.

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