I "know" that any sailmaker can make class legal sails for the Hobie 21 SE, but the rules don't actually say that. The general section of the rules at the beginning says if the sails don't come from Hobie Cat then they're not class legal. Fine for the 14, 16, 17, 18, 19, 20, (I snuck the 19 in there to see if you were counting). Then down in the Hobie 21 section of the rules it has a diagram as an adjunct to section 5.8 of the Hobie 21 rules. The diagram details the sail dimensions and there's also a description of the ISAF procedure for measuring sails. There is no rule 5.8 in the Hobie 21 rules. Is there someplace where it says what Calvert, Ullman, Whirlwind, and a whole bunch of other guys are telling me?