The 2005 handicap for my boat was 0.856, inboard engine, hanked on sails. There is an allowance for furling headsail but you must use the same sail for an entire series. The form looks quite daunting but they already have hull measurements on file all you have to do is measure the sails. You can weigh the boat on a weighbridge or with a loadcell or accept the builders weight. Cost is £8.20 per metre(£65.76). Further details rorcrating.com
trevor skippins