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.
Turkmenistan (Turkmen:Türkmenistan) is a state-owned Turkmeniantelevision channel founded in 2004. As with other channels of Turkmenistan, it is under the control of the Coordinating Council for Television and Radio Broadcasting of the Cabinet of Ministers of Turkmenistan. The channel was created in order to avail the international community with the achievements of Turkmenistan in the country's historical transformations in all spheres of public life, as well as to further improve the country's information systems. Altyn Asyr has positioned itself as the main TV channel of Turkmenistan. Television is broadcast in seven different languages including Turkmen, Russian, English, French, Chinese, Arabic and Persian. The headquarters is located in Ashgabat.
The channel doesn't air Watan Habarlary, unlike the other Turkmen channels.