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Old 03-12-2018, 05:00 PM   #101 (permalink)
freebeard
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Valved hydrogen bubbles. See graysgarage.

a real-world example that approaches the bionic shape is the 1947 Volkhart-Saggitta:



It's Cd was verified in a modern wind tunnel. It has 25hp and a 90mph top speed. One or two examples remain.

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