Propulsion is a means of creating force leading to movement. 40x40px Look up propulsion in Wiktionary, the free dictionary. A propulsion system has a source of mechanical power (some type of engine or motor, muscles), and some means of using this power to generate force, such as wheel and axles, propellers, a propulsive nozzle, wings, fins or legs. Other components such as clutches, gearboxes and so forth may be needed to connect the power source to the force generating component.

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