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U-2
Superwing Photo: Robert Deering 10/23/2006 Smithsonian National Air and Space Museum Dulles International Airport (IAD) Chantilly, Virginia |
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Designer Don Mitchell built his first airplane in 1929 while still in high school. Along with sailplane designer Hawley Bowlus he founded Bowlus Sailplanes Inc. in 1937. The company produced kit planes such as the "Baby Albatross." During World War II they built CG-4A gliders for the U.S. Army. After the war he designed the successful series of ultralight, all-wing airplanes called the B-10 and the U-2 Superwing. He began work on the B-10 in 1975 and the aircraft first flew in 1976. This simple inexpensive, fun flyer became so popular that Mitchell decided to design a new version that he designated the U-2. He made many improvements and first flew the new version in 1979.To convert the basic B-10 airframe into a U-2, Mitchell modified the wing and added a completely enclosed cockpit, but he gave builders the option to install fixed or retractable landing gear. The pilot could operate the wingtip rudders either independently to provide yaw control or simultaneously for aerodynamic braking. Stabilators suspended at the trailing edge of each outboard wing panel provided pitch and roll control. The U-2 had nose wheel steering and braking. A small, two-cycle pusher engine propelled this single-seat, single-engine, flying wing. The factory had sold more than 1,500 Superwing kits by the mid-1980s, largely because Mitchell initially priced the basic kits to sell at $2,795, less power and paint. He estimated that the builder with average skills could complete a Superwing airframe in 250 hours, and spend another 100 hours or so installing the engine and painting the ultralight. Pilots could either fly the U-2 as a powered aircraft or switch off the engine and soar as a sailplane. Advertised lift-to-drag ratio was 25:1. A pilot flying a U-2 set the World Record Altitude for Class C1 (single-engine land aircraft not exceeding 297 kg/661 lb gross weight) in 1984 when he flew to 7,886 m (25,940 ft). Pilots generally favored the ultralight's flying and maintenance qualities but some reported difficulty handling the airplane in all but light winds. Dimensions: Wingspan: 10.3 m (34 ft) Length: 2.4 m (8 ft) Height: 0.9 m (3 ft) Weights: Empty, 136.4 kg (335 lb) Gross, 192 kg (630 lb) Engine: Cuyuna UL2-11 two-cylinder, two-cycle, 35 horsepower Physical Description: Pusher-engine flying wing; kit-built with 35hp Cuyuna engine; white wings, white fuselage, green front and maroon stripes.
Source:
Smithsonian Air & Space Museum |
