A #photograph of the #Apollo Service Module’s side, showing one of the four #thruster quads that helped the #spacecraft control its attitude and position.
Each #quad has four R-4D #rocket #engines.
Similar thrusters have been flying on spacecraft ever since, including the new lunar exploration spacecraft Orion.

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#Apollo, #ApolloServiceModule, #ApolloCSM, #ReactionControlSystem, #RCS, #ThrusterQuad, #R4D, #RocketEngine, #Photography