Leonardo da Vinci and Flight | National Air and Space Museum
https://airandspace.si.edu/stories/editorial/leonardo-da-vinci-and-flight
WEBAug 22, 2013 · Most of Leonardo’s aeronautical designs were ornithopters, machines that employed flapping wings to generate both lift and propulsion. He sketched such flying machines with the pilot prone, standing vertically, using arms, using legs. He drew detailed sketches of flapping wing mechanisms and means for actuating them.
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