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Alexandros Retsinas explains the physics of apparent wind and its impact on sail trim and boat speed.▶ 0:01 As a vessel accelerates, the apparent wind shifts forward, requiring the crew to sheet in the sails to maintain optimal aerodynamic efficiency.▶ 0:57 This shift occurs because the apparent wind is a vector combination of the true wind and the wind generated by the boat's own forward motion.▶ 0:57 When sailing at higher speeds, the apparent wind angle moves forward, increasing the force on the sails but also increasing the tendency for the boat to heel or drift.▶ 1:55 To counteract this, the rudder and keel provide lateral resistance.▶ 2:46 Maximum performance is typically achieved at an apparent wind angle of approximately 70 degrees, though this varies by vessel design.▶ 3:43 Retsinas emphasizes that true wind is largely irrelevant to the sailor once the boat is moving, as the sails react only to the apparent wind.▶ 1:49 Adjusting sail trim in response to these changing vectors is essential for maintaining speed and balance.▶ 1:55

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