R-4D

The R-4D is a small hypergolic rocket engine, originally designed by Marquardt Corporation for use as a reaction control system thruster on vehicles of the Apollo crewed Moon landing program. Aerojet Rocketdyne manufactures and markets modern versions of the R-4D.

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1960  Wikimedia, Wikidata
Aerojet R-4D; Marquardt R-4D
liquid propellant rocket engine, Aerojet Rocketdyne, 
United States, Ashkenaz, Calvinist Republic of Ghent, Chinland, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Sikh Confederacy, Sweden, Tarshish, Dong Fang Hong 2, Ekran, 1960, 

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Location: KML, Cluster Map, Maps,

• 

  R-4D-11 ⓘ
  model of hypergolic rocket engine

• 

  R-4D-15 HiPAT ⓘ
  model of hypergolic rocket engine

Frameless

AS14-66-9340 (6 Feb. 1971) --- A view from inside the Lunar Module (LM) following the second Apollo 14 extravehicular activity (EVA). At the left foreground is the modularized equipment transporter (MET).

AS17-147-22472HR

Both Cassini main engines

SM Steuerdüsen

HTV-1 close-up view

Gemini and Apollo rocket engines

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

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

Type	Subtype	Date	Description	Notes	Source
class	rocket engine		R-4D-11	R-4D	Wikidata
class	rocket engine		R-4D-15 HiPAT	R-4D	Wikidata
commons	image		AS14-66-9340 (6 Feb. 1971) --- A view from inside the Lunar Module (LM) following the second Apollo 14 extravehicular activity (EVA). At the left foreground is the modularized equipment transporter (MET).		Commons
commons	image		AS17-147-22472HR		Commons
commons	image		Both Cassini main engines		Commons
commons	image		SM Steuerdüsen		Commons
commons	image		HTV-1 close-up view		Commons
commons	image		Gemini and Apollo rocket engines		Commons
commons	image		RCS quad containing four R-4D thrusters, as used on the Apollo Service Module		Commons
commons	image		RCS quad containing four R-4D thrusters, as used on the Apollo Service Module		Commons