There are no powered spinning propellers in nature. When evolution has found an advantage to producing thrust in a fluid, it has done it mainly by flapping things back and forth - and a new VTOL aircraft propulsion system aims to do the same with a series of flapping wings mounted in large ducts.
.. Continue Reading Bizarre Volerian aircraft design replaces jets and props with flapping wingsCategory: Aircraft
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from New Atlas (Gizmag) https://ift.tt/2POgQAE
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