What did Apollo CM use helium for?

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    Apollo Helium
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Discussion Overview

The discussion centers around the use of helium in the Apollo Command Module (CM), specifically its purpose and location within the spacecraft. Participants explore its role in relation to propulsion and attitude control systems.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the specific use of helium tanks in the Apollo CM.
  • Another participant suggests that helium was used to feed propellant for attitude control and possibly the main engine, questioning whether these tanks were located in the Service Module or the Command Module.
  • A third participant references a Wikipedia article indicating that helium tanks were part of the CM's reaction control subsystem.
  • A later reply acknowledges the need for attitude control thrusters during re-entry after the Service Module is ejected, indicating a realization of the complexities involved.

Areas of Agreement / Disagreement

Participants express varying views on the specific functions of helium in the Apollo CM, with no consensus reached on its exact applications or the details of its integration within the spacecraft.

Contextual Notes

There are unresolved questions regarding the specific configurations and functions of the helium tanks, as well as the distinctions between the Command Module and Service Module in this context.

saddlestone-man
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TL;DR
Why were there tanks of helium on the CM?
Hello All

Diagrams of the Apollo Command Module show tanks of helium, What was this used for?

best regards ... Stef
 
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I think it was used to feed propellent for attitude control and perhaps the big engine. Were these in the Service module or the command module?
 
Of course you would still need attitude control thrusters for re-entry (after ejecting the Service module). Duh I didn't even think it through.
 

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