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Aerodynamic lift on a sailboat results from air viscosity, the boundary layer, and the Kutta condition, rather than the commonly cited Venturi effect.▶ 3:08 Contrary to the popular myth that the jib accelerates air through the slot to increase speed, the jib actually slows the airflow on the leeward side of the mainsail to prevent flow separation and stalling.▶ 1:36 Simultaneously, the mainsail creates an upwash that increases airflow velocity over the jib, allowing the two-sail system to generate more lift than a single sail.▶ 4:19 Harvel Gentry’s aerodynamic theories explain this interaction through the creation of a global circulation field initiated by a starting vortex at the trailing edge.▶ 2:24 Practical sail trim requires balancing halyard tension, outhaul, sheet, traveler, and vang to manage twist, which compensates for the wind gradient caused by friction near the water surface.▶ 5:11 Increasing twist reduces overall power, requiring precise adjustments based on wind speed, direction, and sea state.▶ 5:43

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