Rocket Engine

A rocket engine, or simply "rocket", is a jet engine that uses only stored propellant mass for forming its high speed propulsive jet. Rocket engines are reaction engines and obtain thrust in accordance with Newton's third law. Since they need no external material to form their jet, rocket engines can be used for spacecraft propulsion as well as terrestrial uses, such as missiles. Most rocket engines are internal combustion engines, although non-combusting forms also exist.

Rocket engines as a group have the highest exhaust velocities, are by far the lightest, but are the least propellant efficient of all types of jet engines.

Read more about Rocket EngineTerminology, Principle of Operation, Overall Rocket Engine Performance, Cooling, Mechanical Issues, Acoustic Issues, Testing, Safety, Chemistry, Ignition, Plume Physics, History of Rocket Engines

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History of Rocket Engines
... The aeolipile described in the first century BC (often known as Hero's engine) essentially consists of a steam rocket on a bearing ... was a precursor to the development of the first solid rocket ... Elixir of life this accidental discovery led to fire arrows which were the first rocket engines to leave the ground ...

Famous quotes containing the words engine and/or rocket:

    There is a small steam engine in his brain which not only sets the cerebral mass in motion, but keeps the owner in hot water.
    —Unknown. New York Weekly Mirror (July 5, 1845)

    A rocket is a reed that thinks brilliantly.
    José Bergamín (1895–1983)