Sikorsky XR-4 helicopter

US Army Sikorsky XR-4 helicopter (originally the Vought-Sikorsky XR-4C, s/n 41-18874). The XR-4 was the world's first mass-production helicopter and the first successful production rotorcraft of single-rotor configuration. The success of this aircraft paved the way for the large-scale introduction of more advanced rotorcraft into military and civilian service. The XR-4 represents the culmination of Igor I. Sikorsky's attempts to create a practical helicopter. This example was built in 1942. The photo was taken on Sept. 1, 2025, at the Smithsonian Institution's National Air and Space Museum (NASM) Steven F. Udvar-Hazy Center in Chantilly, Virginia, by Mike Hirschberg. CC BY-SA 4.0

Added to Udvar-Hazy Center (2025) and categorized in Aircraft/Overviews — 4 months ago

License: Creative Commons Attribution-ShareAlike

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