R-4D Rocket engine 3D model

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The R-4D is a small hypergolic rocket engine, originally designed by Marquardt Corporation for use as a reaction control thruster on vehicles of the Apollo moon program. The engine runs on self-igniting components: monomethylhydrazine and nitrogen tetroxide. The R-4D is a fuel-film cooled engine. Some of the fuel is injected longitudinally down the combustion chamber, where it forms a cooling film. It is rated for up to one hour of continuous thrust, 40,000 seconds total, and 20,000 individual firings.