The Orbital Maneuvering System, which is made up of two Orbital Maneuvering System engines and all of their related hardware. One Orbital Maneuvering System engine is housed in each of two Orbital Maneuvering System (OMS)/Reaction Control System (RCS) pods attached to the top aft end of the Orbiter.
The system consist of hypergolic liquid-propellant rocket engines used on the Space Shuttle. Designed and manufactured in the United States by Aerojet, the system was used during launch to produce supplementary thrust and on-orbit to provide orbital injection, orbital correction and the spacecraft's deorbit burn.[2] The OMS pods contains a single AJ10-190 engine, based on the Apollo Service Module's Service Propulsion System engine,[citation needed] which produces 26.7 kilonewtons (6,000 lbf) of thrust with a specific impulse (Isp) of 316 seconds.[3] Each engine could be reused for 100 missions and was capable of a total of 1,000 starts and 15 hours of burn time.
These pods also contained the Orbiter's aft set of reaction control system (RCS) engines, and so were referred to as OMS/RCS pods. The OM engine and RCS systems both burned monomethylhydrazine (MMH) as fuel, which was oxidized with dinitrogen tetroxide (N2O4), with the propellants being stored in tanks within the OMS/RCS pod, alongside other fuel and engine management systems. When full, the pods together carried around 8,174 kilograms (18,021 lb) of MMH and 13,486 kilograms (29,732 lb) of N2O4, allowing the OMS to produce a total of around 1,000 feet per second (300 m/s) of delta-v with a 65,000-pound (29,500 kg) payload.
The Reaction Control System, which is made up of thrusters fired to help the Orbiter achieve a precise orbital path or perform changes in its position, and all of their related hardware. Thrusters are located at the forward end of the Orbiter and in each of the two aft Orbital Maneuvering System (OMS)/Reaction Control System (RCS) pods.
The RCS contains a total of 38 primary thrusters and 6 vernier thrusters. The forward RCS array contains 14 primary thrusters and two vernier thrusters. A total of 12 primary thrusters and two vernier thrusters are housed in each of the two OMS/RCS pods. Below are a few reference images of the main engine with her OMS/RCS pods.
Each RCS thruster burns a combination of monomethyl hydrazine and nitrogen tetroxide liquid fuel. Each primary thruster can produce a thrust of 870 pounds, while each vernier thruster can produce a thrust of 24 pounds. The RCS thrusters can be fired in a plethora of combinations depending on the specific mission requirements.
More after the jump.
