Seriously look at the damn site, look at the diagrams, if you can read a tape you can measure a beachcat including the sails! For f#@$ sake you don't even have to do the math there is a spreadsheet for that!
I just spent most of the day measuring my Isotope to generate a SCHRS handicap for it. I agree that it isn't "rocket science", but it is not as simple as you make it out to be either. There's no guidance on how to take measurements, and many of the calculations (all the mast, boom, and sail areas) must be done outside of the SCHRS spreadsheet.
I took some values from the factory specs, measured what I could, used some measurements that were taken in slightly different ways than diagrammed, and guesstimated one (I didn't want rig the boat in the rain). I'm not sure I got things right, but if so, the Isotope is faster than I thought. According to Portsmouth DPN, an Isotope (1-up) is 2.3% faster than a Hobie 16 (2-up). According to the SCHRS number I derived, I owe a 2-up H16 11.3% According to DPN, A Hobie 18 is about 4% faster than an Isotope, but SCHRS says I owe a TheMightyHobie18 almost 2%. On DPN, I've always sailed nearly even against a Hobie 17, but SCHRS says I owe an H17 over 12%.
Maybe I got the measurements wrong. I'd be happy to measure my boat with someone experienced with SCHRS. If, however, an Isotope really is that much faster than other sloop-rig catamarans, then I'm less skilled than I thought.
