Word: venturi
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Dates: during 1950-1959
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Once he had learned that air, moving over a still airfoil, also generates lift, Custer went on to investigate the principle of the Venturi tube. He learned that the faster air flows through a tube with a narrow throat and flaring ends, the lower goes the pressure within the tube. With that primitive knowledge in hand, he decided that he could build a plane that would combine the advantages, of a helicopter with the speed of normal, fixed-wing aircraft. After some 20 years of tinkering, Custer completed a crude, full scale, flying model of a "Custer Channel Wing" airplane...