A helicopter's rotor design may allow for vertical takeoffs but that comes at a price—the backwards moving blade counteracts the helicopter's forward momentum, causing it to stall at high speeds. But one German firm believes that outfitting the blades with bumps inspired by the fins of humpback whales will speed whirly-bird flights significantly.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/G6M3n1Z2Kew/helicopters-are-about-to-get-a-lot-faster-thanks-to-humpback-whale-fins
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