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jet propelled aircraft - traduction vers néerlandais
![SST]] providing service from 1976 to 2003](https://commons.wikimedia.org/wiki/Special:FilePath/British Airways Concorde G-BOAC 03.jpg?width=200 "SST]] providing service from 1976 to 2003")
.jpg?width=200 "km/h}}")
![The [[Heinkel He 178]] was the first aircraft to fly on turbojet power, in August 1939](https://commons.wikimedia.org/wiki/Special:FilePath/Ohain USAF He 178 page61.jpg?width=200 "The [[Heinkel He 178]] was the first aircraft to fly on turbojet power, in August 1939")
![The Sikorsky S-69 was a [[compound helicopter]] with auxiliary turbojets](https://commons.wikimedia.org/wiki/Special:FilePath/XH-59 U.S. Army demonstrator.jpg?width=200 "The Sikorsky S-69 was a [[compound helicopter]] with auxiliary turbojets")
Définition
Wikipédia
A jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by jet engines.
Whereas the engines in propeller-powered aircraft generally achieve their maximum efficiency at much lower speeds and altitudes, jet engines achieve maximum efficiency at speeds close to or even well above the speed of sound. Jet aircraft generally cruise most efficiently at about Mach 0.8 (981 km/h (610 mph)) and at altitudes around 10,000–15,000 m (33,000–49,000 ft) or more.
The idea of the jet engine was not new, but the technical problems involved could not begin to be solved until the 1930s. Frank Whittle, an English inventor and RAF officer, began development of a viable jet engine in 1928, and Hans von Ohain in Germany began work independently in the early 1930s. In August 1939 the turbojet powered Heinkel He 178, the world's first jet aircraft, made its first flight. A wide range of different types of jet aircraft exist, both for civilian and military purposes.
