Figure 1-3.  Rogallo’s flexible wing for a kite, submitted for patent  in 1948. Figure 1-4.  NASA testing the Rogallo wing, which led to the modern  hang glider and WSC aircraft. Figure 1-5.  Barry Palmer flying a foot-launched hang glider in  1961. During this same period, other pioneering engineers and  enthusiasts started developing the Rogallo wing for sport. One  was aeronautical engineer, Barry Palmer, who saw pictures of  the NASA wings and, in 1961, constructed and flew a number  of hang gliders based on the Rogallo design.  [Figure 1-5] His efforts and others evolved to the WSC aircraft in the late  1960s. Another pioneer was John Dickenson of Australia  who used the NASA Rogallo wing design but incorporated  a triangular control bar that provided structure for the wing  during flight with fl ying wires.  [Figure 1-6] 1-3