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GENUINE Apollo Command Service Module Engine

Original Backup Engine

Remaining Time   66 Days, 9 Hours
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This very rare space item can be seen at “The San Fernando Museum of Aerospace” located at 7429 Laurel Canyon Boulevard, North Hollywood, CA 91605. Further information can be obtained by calling 818-765-1087. This facility is one of the most historically significant Space related museums in the United States.

The Apollo Service Module Propulsion System (SPS) was a liquid-fuel rocket engine used on Apollo spacecraft.  Apollo astronauts used the SPS to steer the spacecraft toward the Moon, place it into lunar orbit, and propel it back toward Earth.

Two of the large round Titanium fuel tanks are shown in the picture sitting on the black plastic pallets. These tanks are heavy gauge high pressure, yet extremely lightweight.

Using storable propellants, the SPS produced a thrust of 21,900 pounds for a minimum of 0.4 seconds or up to 12.5 minutes, as required. The SPS The Service Propulsion System (SPS) is the Command/Service Module main engine and provides the impulse for all velocity changes (ΔVs) throughout a mission and the SPS abort capability after the launch escape tower is jettisoned. The engine uses Aerozine 50 (hydrazine/UDMH) fuel and nitrogen tetroxide oxidizer and has a nominal thrust of 20,500 lbf (91.2 kN)[2]. This hypergolic fuel combination is pressurized with helium during thrusting periods, so no propellant pump is needed. The propellant flow from the tanks to the thrust chamber is controlled by the engine injector valves, which are pneumatically controlled with nitrogen. The engine is gimbaled to allow Thrust Vector Control (TVC) during a burn.gine served successfully on all Apollo missions, including the Apollo-Soyuz Test Project in 1975.

Service Module

The SM was a cylinder 3.9 meters in diameter and 7.6 m long which was attached to the back of the CM. The outer skin of the SM was formed of 2.5 cm thick aluminum honeycomb panels. The interior was divided by milled aluminum radial beams into six sections around a central cylinder. At the back of the SM mounted in the central cylinder was a gimbal mounted re-startable hypergolic liquid propellant 91,000 N engine and cone shaped engine nozzle. Attitude control was provided by four identical banks of four 450 N reaction control thrusters each spaced 90 degrees apart around the forward part of the SM. The six sections of the SM held three 31-cell hydrogen oxygen fuel cells which provided 28 volts, two cryogenic oxygen and two cryogenic hydrogen tanks, four tanks for the main propulsion engine, two for fuel and two for oxidizer, and the subsystems the main propulsion unit. Two helium tanks were mounted in the central cylinder. Electrical power system radiators were at the top of the cylinder and environmental control radiator panels spaced around the bottom.

Additional Information
Is this item covered by the United States Munitions List (USML)? Yes
Product has Conformance Documentation No
Product has Inspection / Test Reports No
Product has Traceability Documentation No
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