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S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...

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S.5 Jet <strong>Propulsion</strong> System<br />

- 11-<br />

These systems are based on jet propulsion devices that produce thrust by ejecting<br />

s<strong>to</strong>red matter, called the propellant.<br />

The main features of jet propulsion are:<br />

Rocket launch<br />

Launch <strong>Propulsion</strong> for launching rockets with the following<br />

characteristics:<br />

- high velocity increment capability (7 - 11.5 km/s)<br />

- very high thrust levels (ratio thrust/launch vehicle<br />

weight: >1.3 )<br />

- low fraction of take-off mass of launch vehicle for<br />

payload mass (1 - 5%) of the launching vehicle<br />

- powerful chemical rockets

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