An airfoil is a curved surface designed to create lift as air flows over it. On a sailboat, the sails and the underwater keel act as these specialized shapes. The difference in air pressure on each side of the sail pulls the boat forward. A trimmer shapes the sail into an airfoil to gain speed in light winds. This shape allows the boat to sail at an angle toward the wind source. Engineers test these curves to maximize the power generated by the wind and water. A smooth airfoil shape reduces drag and improves the overall efficiency of the vessel. Mastering sail trim ensures the airfoil stays effective in different weather conditions.
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