Sustainer Engine

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Sustainer Engine

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A rocket engine that maintains the velocity of a rocket vehicle once it has achieved its programmed velocity by use of booster or other engine. </dd>
This term is applied, for example, to the remaining engine of the Atlas after the two booster engines have been jettisoned. The term is also applied to a rocket engine used on an orbital flider to provide the small amount of thrust now and then required to compensate for the drag imparted by air particles in the upper atmosphere. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use