Ascent Propulsion System

The ascent propulsion system (APS) or lunar module ascent engine (LMAE) is a fixed-thrust hypergolic rocket engine developed by Bell Aerosystems for use in the Apollo Lunar Module ascent stage. It used Aerozine 50 fuel, and N
₂O
₄ oxidizer. Rocketdyne provided the injector system, at the request of NASA, when Bell could not solve combustion instability problems.

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APS, LMAE, Lunar Module Ascent Engine
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Apollo Lunar Module Ascent Engine

View of O&C Building Altitude Chambers

Lunar module ascent engine

Type	Subtype	Date	Description	Notes	Source
commons	image		Apollo Lunar Module Ascent Engine		Commons
commons	image		View of O&C Building Altitude Chambers		Commons
commons	image		Lunar module ascent engine		Commons