page_title: Boeing 367-80
section_title: Use as an experimental aircraft
hierarchical_section_title: Boeing 367-80 / Operational history / Use as an experimental aircraft
caption_attribution_description: English: Boeing 367-80, the Prototype of the 707-series, located in the Steven F. Udvar-Hazy Center - the museumshangar of the Smithsonian-Institute in Washington DC Deutsch: Boeing 367-80, der Prototyp zur 707-Baureihe, im Steven F. Udvar-Hazy Center - dem Museumshangar des Smithsonian-Institutes in Washington DC
context_page_description: The Boeing 367-80, known simply as the Dash 80, is an American quadjet prototype aircraft built by Boeing to demonstrate the advantages of jet propulsion for commercial aviation. It served as basis for the design of the KC-135 tanker and the 707 airliner.
  The Dash 80 first flew in 1954, less than two years from project launch. Its US$16 million cost was an enormous risk for Boeing, which at the time had no committed customers. Only one example was built, which has been preserved and is currently on public display at the Udvar-Hazy Center in Virginia.
context_section_description: After the arrival of the first production 707 in 1957 the Dash 80 was adapted into a general experimental aircraft and used by Boeing to test a variety of new technologies and systems. One of its most important tasks during the late 1950s was to test systems for the new Boeing 727, including the fitting of a fifth engine in the rear fuselage. Other tests included experiments with different airfoil shapes and a number of high lift devices such as blown flaps, in which compressed air bled from the engines is directed over the flaps to increase lift during takeoff and landing.
caption: Boeing 367-80 at the National Air and Space Museum's Steven F. Udvar-Hazy Center (2009)
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