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 SikorskyIt would be right to say that the helicopter's role in saving lives represents one of the most glorious pages in the history of human flight.
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