Vought-Sikorsky XR-4C at the Udvar-Hazy Center

     

Vought-Sikorsky XR-4C at the Udvar-Hazy Center

The XR-4 served as the prototype for the world's first mass-produced helicopter.

Image Number: WEB10835-2008
Credit: Image by Dane Penland, National Air and Space Museum, Smithsonian Institution
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