The first three compressor stages were replaced with two fan stages, which extended beyond the compressor casing to act like propellers. The resulting increase in airflow lowered fuel consumption, noise, and emissions. JT3Ds became widely used, especially on long-range Boeing s and Douglas DC-8s. Gift of Pratt & Whitney Aircraft Division. Jun 28,  · A jet airliner or jetliner is an airliner powered by jet engines (passenger jet aircraft).Airliners usually have two or four jet engines; three-engined designs were popular in the s but are less common today. Airliners are commonly classified as either the large wide-body aircraft, medium narrow-body aircraft and smaller regional jet.. Most airliners today are powered by jet . Jul 03,  · This led to the invention of jets, which are used by both the military and commercial airlines. A jet is an airplane propelled by jet engines. Jets fly much faster than propeller-powered aircraft and at higher altitudes, some as high as 10, to 15, meters (about 33, to 49, feet).
Jun 28,  · A jet airliner or jetliner is an airliner powered by jet engines (passenger jet aircraft).Airliners usually have two or four jet engines; three-engined designs were popular in the s but are less common today. Airliners are commonly classified as either the large wide-body aircraft, medium narrow-body aircraft and smaller regional jet.. Most airliners today are powered by jet . Whittle had a running bench model by the spring of , but backing from industrialist Ernst Heinkel gave von Ohain the lead. The He , the first jet-powered aircraft, flew on Aug. 27, , nearly two years before its British equivalent, the Gloster E/39, on May 15, Jul 23,  · At the time, von Ohain was investigating a new type of aircraft engine that did not require a propeller. Only 22 years old when he first conceived the idea of a continuous cycle combustion engine in , von Ohain patented a jet propulsion engine design in very similar in concept to that of Sir Whittle, but different in internal arrangement.

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