Jet aircraft

Boeing 747SP of the Bahrain Royal FlightLockheed Martin F-22 Raptor

Heinkel He 178, in August 1939 the world's first aircraft to fly purely on turbojet power

A jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by jet engines (jet propulsion).

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 (609 mph, 981 km/h or 273 m/s) at altitudes around 10,000–15,000 metres (33,000–49,000 ft) or more.

单词	Jetplanes
释义	Jetplanes 英语百科 Jet aircraft A jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by jet engines (jet propulsion). 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 (609 mph, 981 km/h or 273 m/s) at altitudes around 10,000–15,000 metres (33,000–49,000 ft) or more.
随便看	ATCKs的意思 ATCL的意思 at close hand的意思 at close quarter的意思 at closequarters的意思 At Close Quarters的意思 at close range的意思 at closing time的意思 ATCO的意思 at collage的意思 at college的意思 atcome的意思 at ... command的意思 AT command的意思 AT command set的意思 AT command set AT的意思 ATCOMS的意思 at concert pitch的意思 at considerable length的意思 at constant market price的意思 at constant price的意思 at constant prices的意思 at constant temperature的意思 at ... convenience的意思 at convenience的意思

Jetplanes

Jet aircraft