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Heinkel He 178
Heinkel He 178The Heinkel He 178, the world's first turbojet-powered aircraft.

turbojet

engineering
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turbojet,jet engine in which a turbine-driven compressor draws in and compresses air, forcing it into a combustion chamber into which fuel is injected. Ignition causes the gases to expand and to rush first through theturbine and then through a nozzle at the rear. Forward thrust is generated as a reaction to the rearward momentum of the exhaust gases.

The first turbojet-powered aircraft, a Heinkel He 178, was flown inGermany in 1939. A turbojet had beendevised some years earlier in England bySir Frank Whittle, but the first flight using his engine did not take place until 1941.

During the 1960s theturbofan, or fanjet, a modification of the turbojet, came into common use. Some of the incoming air is bypassed around the combustion chamber and is accelerated to the rear by a turbine-operated fan. The turbofan moves a much greater mass of air than the simple turbojet, providing advantages inpower and economy.Compareramjet.

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