Later, still at Ames, Jones promoted the idea of an oblique wing. (The first known oblique wing design was Blohm & Voss P202, proposed by Richard Vogt in 1942.) Jones’s wind tunnel studies indicated that such a wing design on a supersonic transport might achieve twice the fuel economy of an aircraft with conventional wings. The concept was flight tested successfully on the NASA AD-1. This unique aircraft had a wing which pivoted about the fuselage, remaining perpendicular to it during slow flight and rotating to angles up to 60 degrees as aircraft speed increased. Analytical and wind tunnel studies by Jones indicated that a transport-sized oblique-wing aircraft flying at speeds up to Mach 1.4 (1.4 times the speed of sound) would have substantially better aerodynamic performance than an aircraft with conventional wings at the same speed. A current DARPA project that has been awarded to Northrop Grumman, called the Switchblade is being developed to provide a more efficient UAV for the US Air Force.