Pulsed plasma thruster
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Pulsed plasma thrusters use an arc of electric current through a solid propellant (almost always teflon), to produce a quick and highly efficient and dependable burst of impulse. PPT's are great for attitude control, and for main propulsion on particularly small spacecraft (those in the hundred-kilogram or less category).

See also: spacecraft propulsion

The original article can be found at: http://en.wikipedia.org/wiki/Pulsed_plasma_thruster.
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