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The sail acts as an aerofoil so that when the boat is sailing close-hauled (close to the wind) the wind hits the leading-edge of the sail end on, the curve of the sail then deflects it and produces the force that has a component in line with the boat that drives it forward, with the keel stopping too much sideways movement.

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Q: Why do sails catch wind when the only part of the sail to be hit is so thin?
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