If you are into this kind of stuff - quite high tech. Short version, lmodern composite structures - the fabric is laid out by machine then vacuum bagged over a programmable mold and cooked.
btw, North windsurfing sails split from North yacht sails years ago.
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Sydney to Hobart Yacht Race: One quarter of fleet retires as US yachts dominate across Bass Strait
Wonder if any these busted sails were made by North? Might take a bit more that packing tape to repair.
http://www.rolexsydneyhobart.com/news/2015/day-2/2015-the-toughest-race-since-2004/
Bill Herderich
Latest: Comanche leading with damaged starboard dagger and rudder. btw, president of North Sails is the skipper. At least his main sail held together.
http://www.sail-world.com/Rolex-Sydney-Hobart---Will-Comanche-take-the-scalp-/141136
bunch of good articles on that site if you are into this sort of thing.
--- The Arrogant Jerk: Crabby and irritable since 1998.