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Cake day: August 2nd, 2023

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  • Good explanation. Another way to think about it is with modern sails and hull design it’s more like a wing. The sail above the water is the more obvious wing shape, and with some designs that use a centerboard or daggerboard that is like the other half of a wing turned on its side. With water having more drag than air, the centerboard is the continued wing shape under the water only shorter.