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Flettner
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Anton Flettner (1885–1961) was a German aviation inventor and engineer, best known for developing the Flettner rotor — a rotating cylinder that generates lift via the Magnus effect — and for pioneering rotor-wing helicopter designs. He appears in the archive as a scientist whose aerodynamic concepts were cited in a 1950 CIA Information Report (CIA-UAP-005) as a possible technical basis for the observed "flying disc" phenomenon.