Chemical propulsion

The chemical propulsion is the mode of Propulsion used mainly in the rocket motor . It does not make any taking away of matter in the ambient conditions, but consists in ejecting a fraction of the clean mass of the system. This mass corresponds to the Ergol S carried or the Propergol ejected. The typical sizes for the rocket motors are a Impulsion specific varying 200s to 440s, for pushes staging itself of 10 ³ NR to 10⁷N according to the size of the engine.

The principal distinctions between the modes of chemical propulsion lie in the state of embarked propellents. The most used are liquid or solid.

the advantages of the solid engines are their simplicity of storage and their speed of setting in motion. One thus finds them on the Missile S for which the decision to use them and the use are separate only of a few seconds, after a sometimes prolonged storage. Their major disadvantage is impossibility of extinguishing them once lit.
the liquid engines offer the possibility of extinctions and many relightings and a facility of modulation of Poussée. They are more difficult to store and of more complex construction. They are also less expensive and energy. One finds them on the launchers and the satellite S for example.

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