The concept of a human-powered helicopter is surprisingly simple. The creation of a human-powered helicopter? Not so simple. People have been trying for 30 years to create a human-powered helicopter that can hover for 60 seconds, reach a height of 10 feet and stay inside a 33-foot box and no one has ever done it yet.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/3Ik8U-0Y9EA/why-cant-we-create-a-human+powered-helicopter-already
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