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Sonic: Sonic is about 340 meters per second. Maher: ultra high-speed units, the ratio of the speed of moving objects with the speed of sound, or Mach Mach. Subsonic: speed is less than Mach 1. Supersonic: Mach speeds between 1-5. Hypersonic: speed supersonic fighter aircraft to break the sound barrier moment supersonic fighter breaking the sound barrier over the moment of the Mach 5.

Hypersonic aircraft uses a supersonic combustion ramjet, which belongs to the class ramjet. Ramjet principle by the French Rennes? Lorrain made in 1913. By a ramjet inlet, combustor, nozzle propulsion consists of three parts, it is much simpler than the turbojet engine. After pressing into the wind stream is the use of engine deceleration, improved static process. The process does not require high-speed rotation, the compressor complicated. High-speed airflow through the expansion decelerated after pressure and temperature, fuel mixture into the combustion chamber and the combustion temperature is 2000-2200 ℃, or even higher, through the expansion accelerated, high-speed discharged from the nozzle to produce thrust.