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

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

Photographer:

Dane Penland

ID #:

WEB10835-2008

Source:

Smithsonian's National Air and Space Museum

Copyright/Owner:

Smithsonian Institution

Terms of Use:

Smithsonian Terms of Use
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