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Sailing upwind relies on the aerodynamic lift generated by the sail, which functions identically to an airplane wing.▶ 0:45 As wind flows over the curved surface of the sail, the pressure differential creates a force that pulls the boat forward and sideways.▶ 1:13 To counteract the lateral force and minimize leeway, a daggerboard provides resistance against the water.▶ 1:54 Because a boat cannot sail directly into the wind without losing airflow and stalling, sailors must maintain a specific minimum angle to the wind to keep the sails powered.▶ 2:18 To reach a destination located directly upwind, the boat must perform a series of tacks, zig-zagging across the wind direction to make progress toward the objective.▶ 3:08 A tack involves turning the bow through the wind to shift the wind angle to the opposite side of the boat.▶ 2:22

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