Whereas the engines in propeller-powered aircraft generally achieve their maximum efficiency at much lower speeds and altitudes, jet engines and aircraft achieve maximum efficiency (see specific impulse) at speeds close to or even well above the speed of sound. Jet aircraft generally cruise at faster than about M 0.8 (609mph, 981km/h or 273m/s) at altitudes around 10,000–15,000 metres (33,000–49,000ft) or more.
Frank Whittle, an English inventor and RAF officer, developed the concept of the jet engine in 1928,Hans von Ohain in Germany, a decade later developed the concept independently at the end of the 1930s. He wrote in February 1936 to Ernst Heinkel, telling him of the design and its possibilities. However, it can be argued that the English engineer A. A. Griffith, who published a paper in July 1926 on compressors and turbines, also deserves credit.
Partly prompted by recent news reports of speed-record-breaking flights over the Atlantic, Shaw and Miyawaki began to investigate and realized there had been very little exploration of how the very fastest jet stream winds would respond to climate change ... physics of jet streams.
2, a day after commercial flights were temporarily halted in Montana. The balloon’s flight across the U.S. captivated the country, and its journey ended when an Air ForceF-22 fighter jet shot down the balloon Feb ...The Pentagon later confirmed the balloon was 200 feet tall and carried a payload the size of a small commercial jet airliner.
The roundtable came amid heightened concerns after off-duty pilot JosephDavid Emerson, 44, allegedly tried to shut down the engines of an Alaska Airlines jet mid-flight on October 22... he roundtable came amid heightened concerns after off-duty pilot Joseph David Emerson, 44, allegedly tried to shut down the engines of an Alaska Airlines jet.
Russia's defence ministry had earlier shown the Kremlin chief's Ilyushin-96 aircraft flanked by Sukhoi-35S fighter jets on its flight from Russia to the United Arab Emirates, Putin's first stop on the trip.
This is more than double the number in recent years despite significantly fewer flights as a result of Putin's war against Ukraine... jet engulfed in flames ... The MIG-31 fighter jet, said to be on a training flight, 'crashed in an uninhabited area,' TASS quoted the ministry as saying.
... (ALK.N) pilot allegedly tried to crash a commercial flight in October. The pilot was charged with trying to disable the engines of a jet in flight and told police afterward he was suffering a nervous breakdown ... 22 Horizon flight had prompted a wider discussion about mental health.