SM RCS Thruster


	Reaction Control System (RCS) thruster as used in the Apollo Service Module and Lunar Module. Manufactured by The Marquardt Corporation as Model R-4D. Rated thrust of 100 pounds. Assembly dated “3Q70” (third quarter of 1970) - at the time of the Apollo moon landings.


	Cutaway view (NASA graphic) shows thruster components and materials. Compare with the Mercury 24-pound thruster and the Gemini 25-pound thruster (below).


	5.17 lbs. (2.33 kg)