When the Odyssey needs to reverse thrust to try and counter a descent towards the TET, Jack calls for a full OMS (Orbital Maneuvering System) burn. We do not see what information he looks at to determine how fast he is approaching the TET, or how he knows that the OMS system will provide enough thrust.
We do see 4 motor systems on board the Odyssey
- The Main Engines (which appear to be Ion Engines)
- The OMS system (4 large chemical thrusters up front)
- A secondary set of thrusters (similar and larger than the OMS system) on the sleep module
- Tiny chemical thrusters like those used to change current spacecraft yaw/pitch/roll (the shuttle’s RCS).
After Jack calls out for an OMS burn, Vika punches in a series of numbers on her keypad, and jack flips two switches under the keypad. After flipping the switches ‘up’, Jack…
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