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Barry Hill Palmer invented the first flexible wing glider in the 1960s using a simple Rogallo wing design. WI this was invented in China and became well known by the 13th century. Like they did with gunpowder and handgonne, the Mongols could spread this technology throughout Eurasia during their conquest.

Bamboo Butterfly, 1966



http://en.wikipedia.org/wiki/Barry_Hill_Palmer
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