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Jet airliner
A jet airliner (or ''jetliner'', or ''jet'') is an airliner powered by jet engines (passenger jet aircraft). Airliners usually have two or four jet engines; three are less common.
Most airliners today are powered by jet engines because they are capable of high speeds and generate sufficient thrust to power large capacity aircraft. Early airliners, introduced in the 1950s, used the simpler turbojet engine, quickly supplanted by turbofans, which have lower noise levels and fuel consumption.
==Early history==
The first airliners with turbojet propulsion were experimental conversions of the Avro Lancastrian piston-engined airliner, which were flown with several types of early jet engine, including the de Havilland Ghost and the Rolls-Royce Nene. They retained the two inboard piston engines, the jets being housed in the outboard nacelles. The first airliner with jet power only was the Nene-powered Vickers VC.1 Viking ''G-AJPH'', which first flew on 6 April 1948.
The early jet airliners had much lower interior levels of noise and vibration than contemporary piston-engined aircraft, so much so that in 1947, after piloting a jet powered aircraft for the first time, Wing Commander Maurice A. Smith, editor of ''Flight'' magazine, said, "Piloting a jet aircraft has confirmed one opinion I had formed after flying as a passenger in the Lancastrian jet test beds, that few, if any, having flown in a jet-propelled transport, will wish to revert to the noise, vibration and attendant fatigue of an airscrew-propelled piston-engined aircraft"
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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