Igor I. Sikorsky, engineering manager of the Vought – Sikorsky Division of the former United Aircraft Corporation, used the Stratford, Conn., sites to design, build, and test his innovative helicopter designs. Sikorsky’s VS-300 model helicopter was the world’s first design which used the now industry-standard single main rotor with an auxiliary anti-torque tail rotor.
America's first practical helicopter, it pioneered the single main rotor concept that became the predominant helicopter configuration throughout the world. The principles that were developed and demonstrated by the VS-300 had direct application in the design of the early mass-production helicopter, marking the beginning of the world's rotorcraft industry.
The initial flight of the VS-300 was piloted by its designer, Igor I. Sikorsky (1889-1972), on September 14, 1939, in Stratford, Connecticut.