Back to the 70's - Mitre Cut Sails
Back in the seventies it wasn't just all about bushy hair and bad fashion. Actually it was! But in the sailmaking world, it was the realm of the mitre cut. When I began sailmaking in the late 70's at Brooke Sails, under the tutelage of Noel Brooke, every headsail we made was a mitre cut sail. The reason was pretty simple, the Dacron sailcloth we used was pretty crappy compared to todays woven cloths and Carbon was something that was left over on the grill after a BBQ! Sail Design was a lot harder back then as the Sail-maker had to think of not only shape but cloth stretch as well. The cloth was very spongy and stretched a lot, particularly in the warp direction along the roll and even more so on the bias. It was marginally more stable on the Fill or Weft direction. I can remember the late Ben Lexcen (or Bob Miller as he was then) telling me that they had to cut their 12 metre class mains 9" (230mm) short on the leech to allow for stretch as the mainsail was sheeted on.