Maurizio and the sail · video

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Maurizio explains the relationship between true wind, boat speed, and apparent wind to determine the most efficient point of sail on Lake Garda.Watch True wind is the ambient air movement felt while stationary, while boat speed creates a headwind effect as the vessel moves.0:46 Apparent wind is the vector sum of these two forces and dictates sail trim and propulsion.2:19 When sailing downwind, the boat speed subtracts from the true wind, resulting in lower apparent wind on the sails.4:56 Conversely, sailing upwind into a close-hauled course increases the apparent wind speed significantly beyond the true wind speed.4:56 For example, with 10 knots of true wind and 5 knots of boat speed, a close-hauled course generates 14 knots of apparent wind, whereas a dead run reduces the apparent wind to 5 knots.4:56 Because higher apparent wind increases the force on the sails, close-hauled or upwind sailing provides more power than downwind sailing.5:54 Upwind sailing generates more apparent wind, making it the most efficient point of sail.6:35

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