A class of sailing vessels designed in such as way so as to standardize the boats involved in a particular competition while still giving individuals the freedom to experiment with their designs.
Equality between boats is ensured by requiring compliance with a formula that takes into account the length at the waterline, the girth (the measurement around the boat from one sideboard, under the keel and then back over the top to the other side) and the sail area. The very specific measurements are then plugged into the formula and the result must be 12 meters. Designers are free to change any of these variables with the understanding that something else will have to give to make the formula work out right.
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