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Depowering the sails and twist
Actually, Sailmc, I think you have that backwards.
With the car forward, the jib sheet is pulling more downward than rearward, putting tension in the leech and allowing the foot to develop more draft. With the car aft, the sheet pulls the foot taut and allows the leech tension to diminish, thus allowing more twist at the top.
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Sailmc wrote:
Moving the car forward decreases leech tension and allows the top of the sail to twist off. Moving the car aft tightens the leech and brings the top of the sail in line with the rest eliminating twist
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