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Mastering mainsail trim requires balancing the aerodynamic triad of angle of attack, draft depth, and twist.1:04 To achieve optimal efficiency, sailors must coordinate four primary controls: the halyard, sheet, traveller, and vang.1:44 The traveller serves as the primary tool for depowering on larger keelboats, allowing the crew to spill wind in gusts without altering the sail's shape.4:01 On lightweight, responsive dinghies like the 420, sailors instead manage power through mast rake and rig tension adjustments to avoid capsizing.4:30 In light air, a deeper draft increases power, while in heavy air, a flatter sail profile with increased twist and a tighter halyard reduces heeling moment.3:53 Contrary to outdated theories, the jib does not accelerate airflow over the mainsail but instead slows it, preventing flow separation.2:26 Effective trim relies on monitoring leech telltales and maintaining a slight, consistent weather helm.5:04 Practical experience and physical feedback at the helm remain essential for translating these aerodynamic principles into boat speed.4:54

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