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 SikorskySupersonic airplanes have carried men at more than 2,000 miles per hour and there are reasons to believe that this speed will be doubled by 1960 or so.
Igor Sikorsky