Igor Sikorsky’s Sikorsky R-4 took its first flight January 13, 1942. This American two-place helicopter had a single, three blade main rotor powered by a radial engine. Originally, this was the Vought-Sikorsky VS-300. Once modified, it became the world’s first mass produced helicopter.
An exhibit including Sikorsky and Orville Wright can be found in the Museum of the Albemarle in Elizabeth City, NC.