First flight of the Hiller OH-23 Raven
Tuesday, November 11, 1947
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Description
Source: "US Army Rotary Wing Training & Test Aircraft 1940s – 1960s", Paul, Fardink, AHS 2018 VTOL History Calendar - April
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Description
Source: "US Army Rotary Wing Training & Test Aircraft 1940s – 1960s", Paul, Fardink, AHS 2018 VTOL History Calendar - April
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