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NASA AD-1 (Oblique Wing Technology Demonstrator)

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The NASA AD-1 is both an aircraft and an associated flight test program conducted between 1979 and 1982 at the NASA Dryden Flight Research Center, Edwards California, which successfully demonstrated an aircraft wing that could be pivoted obliquely from zero to 60 degrees during flight.

The unique oblique wing was demonstrated on a small, subsonic jet-powered research aircraft called the AD-1 (Ames-Dryden-1). The aircraft was flown 79 times during the research program, which evaluated the basic pivot-wing concept and gathered information on handling qualities and aerodynamics at various speeds and degrees of pivot.

The AD-1 was powered by two small Microturbo TRS18-046 turbojet engines, each producing 220 pounds-force (0.98 kN) of static thrust at sea level. These were essentially the same engines used in the BD-5J. The aircraft was limited for reasons of safety to a speed of about 170 mph (270 km/h).

The AD-1 was 38.8 feet (11.8 m) in length and had a wingspan of 32.3 feet (9.8 m) unswept. It was constructed of plastic reinforced with fiberglass, in a sandwich with the skin separated by a rigid foam core. It had a gross weight of 2,145 pounds (973 kg), and an empty weight of 1,450 pounds (660 kg).

A fixed tricycle landing gear, mounted close to the fuselage to lessen aerodynamic drag, gave the aircraft a very "squatty" appearance on the ground. It was only 6.75 feet (2.06 m) high. The wing was pivoted by an electrically-driven gear mechanism located inside the fuselage, just forward of the engines.