Expulsion motor
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Missile's expulsion motor or eject[ion] motor is an element of a missile's propulsion system for the missiles, launched from tubes or otherwise shaped containers.
Below is a typical principal scheme of an expulsion motor.
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axial section
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detailed longitudinal section
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rear end view
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front end view
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Stinger launch motor
And here is a expulsion/sustainer motors burnout sequence of the Redeye missile launch.
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gunner finds a target, aims and pulls the trigger
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expulsion motor burns out, carrying missile away from the gunner
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sustainer ignites, giving the missile speed and acceleration
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launch area is covered with a cloudy exhaust plume