Aviation Photo #2644728 Sikorsky XR-4C Hoverfly (S-47) - USA - Army

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This was officially accepted in May, 1942 and although not the first helicopter to see military service, the XR-4 was the first mass-produced helicopter and the first successful production rotorcraft of single-rotor configuration. The XR-4C came to the Smithsonian Institution in 1947 as part of a larger gift of aircraft transferred from the USAF to the new National Air Museum. It is now on display at the Udvar-Hazy Center.
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    Alastair T. Gardiner
    USA - Army
    Sikorsky XR-4C Hoverfly (S-47)
    Sikorsky S-47 (VS-316A/R-4/HNS)
    Sikorsky S-47 (VS-316A/R-4/HNS)
    Washington - Dulles International
    April 7, 2015
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Photo Added: May 23, 2015

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