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A showing its swept wings. A swept wing is a wing that angles either backward or occasionally forward from its root rather than in a straight sideways direction. Wing sweep has the effect of delaying the shock waves and accompanying rise caused by fluid near the, improving performance. Swept wings are therefore often used on designed to fly at these speeds. Swept wings are also sometimes used for other reasons, such as structural convenience or visibility. Wing sweep at high speeds was first investigated in Germany as early as 1935, but it found no application until just before the end of the.

Swept wings became common on advanced like the and, which demonstrated a decisive superiority over the slower first generation of straight-wing jet fighters during the. Since then, swept wings have become almost universal on all but the slowest (such as the ).

The term 'swept wing' is normally used to mean 'swept back', but other swept variants include, and in which one side sweeps forward and the other back. The also incorporates the same advantages as part of its layout.

The characteristic 'sweep angle' is normally measured by drawing a line from root to tip, 25% of the way back from the leading edge, and comparing that to the perpendicular to the longitudinal axis of the aircraft. Typical sweep angles vary from 0 for a straight-wing aircraft, to 45 degrees or more for fighters and other high-speed designs.

A Burgess-Dunne tailless biplane: the angle of sweep is exaggerated by the sideways view, with washout also present at the wingtips. At the same time the Anglo-Irish engineer was experimenting along similar lines, obsessed with achieving innate stability in flight. He was able to successfully employ severely swept wings in his tailless aircraft (which, incidentally, also used later on) as a means of creating positive.

For a low-speed aircraft, swept wings are useful to avoid problems with the, to move the wing spar into a more convenient location, or to improve the sideways view from the pilot's position. In 1905 he had already built a glider with swept wings and by 1913 he had constructed successful powered variants that were able to cross the. The was exceptionally aerodynamically stable for the time and the was sold to the and the. His work ceased with the onset of war in 1914, but the idea was taken up by in England, who designed a series of gliders and aircraft to Dunne's guidelines, notably the in 1931. However, Dunne's theories met with little acceptance from the leading aircraft designers and companies at the time. The was the first American swept wing airplane, although it was not considered successful. [ ] Development [ ].