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Old 06-13-2021, 02:00 AM   #4 (permalink)
some_other_dave
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It used to blow my mind that a sailboat could sail faster than the actual wind. Then I started wrapping my head around the fact that the sail in question was acting as an airfoil.

Once I realized that this video was actually serious, I figured it probably had something to do with that effect. And it does, indirectly, as the "cylindrical world" animation shows.

-soD
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