R-4D

reaction control system used in spacecraft since the Apollo program. 
Aerojet R-4D, Marquardt R-4D

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Wikimedia, Wikidata
1960 apogee kick motor, reaction control system, United States of America, 

• Freebase entry^@
  

apogee kick motor – 

Frameless

AS17-147-22472HR

Both Cassini main engines

Gemini and Apollo rocket engines

HTV-1 close-up view

RCS quad containing four R-4D thrusters, as used on the Apollo Service Module

SM Steuerdüsen

Type	Date	Description	Keywords	Notes	Source
link		Freebase entry@			Wikidata
image	1972	AS17-147-22472HR			Wikimedia
image		Both Cassini main engines			Wikimedia
image	2010	Gemini and Apollo rocket engines			Wikimedia
image	2009	HTV-1 close-up view			Wikimedia
image	2011	RCS quad containing four R-4D thrusters, as used on the Apollo Service Module			Wikimedia
image	2004	SM Steuerdüsen			Wikimedia

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