Question 1 of 2707066636ee728f7522a1c518f18

Your vessel is drifting with the wind broad on the port beam. The Marconi sail is set and flapping free. When is the maximum drive attained as you sheet in the sail?

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Question 1 of 27070
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Q

Your vessel is drifting with the wind broad on the port beam. The Marconi sail is set and flapping free. When is the maximum drive attained as you sheet in the sail?

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🔍 Key Concepts

• Apparent wind vs true wind when a vessel is drifting or moving • How a Marconi (Bermuda) sail produces lift as an airfoil, not just as a bag catching wind • The relationship between sheet angle, sail shape (draft and twist), and drive (forward force)

💭 Think About

• Think about when a sail generates the most lift, not just when it looks full or is flapping. In what position relative to the apparent wind does an airfoil usually work best? • Compare what happens to drive if the sail is squared off like a parachute versus trimmed like an airplane wing. Which condition gives a smoother, more continuous pull? • Consider what a slight flap at the leech means about your trim: are you generally too tight, too loose, or very close to the optimum point for maximum drive?

✅ Before You Answer

• Identify whether the question is asking about the sail’s angle to apparent wind or true wind under way/drift conditions • Picture the sail as an airfoil: the sail should have smooth flow on both sides with only minimal or no luffing—verify which option best matches that situation • Eliminate any option that clearly describes a sail that is either stalled (overtrimmed) or just flogging (undertrimmed), rather than producing efficient lift