NASA What did Apollo CM use helium for?

[saddlestone-man]

TL;DR Summary

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

 

[hutchphd]

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?

 

[anorlunda]

https://en.wikipedia.org/wiki/Apollo_command_and_service_module
helium tanks for the CM reaction control subsystem

 

[hutchphd]

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.