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E-book Basic Keelboat : The National Standard for Quality Sailing Instruction
Sails are boat's engine and they produce power in one of two ways. When the wind is coming from the side of the boat, it flows around both sides of the sail (like an airplane wing), creating lift which "puls" the boat forward. When the wind is coming form behind the boat, it "pushes" against the sail and simply shoves the boat forward.
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