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Sikorsky R-4 Hoverfly

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Uploaded on Mar 1, 2009

The Sikorsky R-4 was the world's first mass-produced helicopter and the United States Air Force's first service helicopter.

The VS-316, was developed from the famous experimental VS-300 helicopter, invented by Igor Sikorsky and publicly demonstrated in 1940. The VS-316 was designated the XR-4, under the United States Army Air Forces' series for "Rotorcraft". The XR-4 made its initial flight on 13 January 1942 and as a result of its successful flight tests, the United States Army Air Forces ordered three YR-4As and 27 YR-4Bs.

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