Sail

A sail is a piece of shaped material used to capture wind energy and convert it into propulsion for a vehicle, most commonly a boat. The design and shape of the sail are critical, as they determine the force captured and the directional efficiency of the vessel. Aerodynamic principles govern the performance, requiring the sail to generate lift—a force perpendicular to the direction of the wind—in addition to the simple drag force. Modern sailing designs utilize complex computational fluid dynamics models to optimize profiles, creating foils that act similarly to wings. The interaction between the mast, rigging, and sail material must be precisely engineered to withstand tremendous forces while maintaining optimal aerodynamic performance in varying wind conditions.