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

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S.9 Summary<br />

- 18-<br />

<strong>Propulsion</strong> is needed for launching of spacecrafts, for spacecraft orbit transfer as well as<br />

their orbit and attitude control.<br />

Here, only propulsion systems will be dealt with which are based on jet propulsion<br />

devices that produce thrust by ejecting s<strong>to</strong>red matter, called the propellant.<br />

Differences of launch and space propulsion have been mentioned.<br />

<strong>Propulsion</strong> subsystem requirements have been listed.<br />

Jet propulsion can be classified according <strong>to</strong> the source of energy utilized for the<br />

ejection of propellant: chemical, electric and nuclear.

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