It would be right to state that, with the successful flight of the XR-4 in the summer of 1942, the helicopter became a reality in the United States.
Igor SikorskyThe helicopter is probably the most versatile instrument ever invented by man. It approaches closer than any other to fulfillment of mankind's ancient dreams of the flying horse and the magic carpet.
Igor SikorskyAt that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.
Igor Sikorsky