Manufacturing Industry
The Sikorsky R-4 helicopter: the Sikorsky R-4 was the first production single rotor helicopter. Introduced to the U.S. Army Air Corps in 1941, it served as a rescue and reconnaissance aircraft during World War II.(Centennial Of Flight 1903-2003)
Advanced Materials & Processes, August, 2003 by Lawrence, Thomas H.
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Igor Sikorsky began to work on helicopter design in 1939, after convincing United Aircraft (now United Technologies Corporation) to provide a small amount of funding for helicopter development. United Aircraft supported this work, and also merged Vought and Sikorsky together to reduce costs.
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(They were separated at the end of 1942.) The helicopter, designated VS-300, made its first short flight on September 14, 1939 (Fig. 1). After much trial and error, this machine would become the first practical single rotor helicopter and the prototype for most helicopters flying today. ...
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