I've read the Falcon 9 uses helium pneumatics to extend its legs.

The separation pushers are also helium pneumatics and I believe those are precharged so no pumps required.

Are the leg cylinders precharged too?

  • $\begingroup$ Pumps for the helium? $\endgroup$ Commented Mar 25, 2021 at 16:08
  • $\begingroup$ There has to be a pressure source. What is that pressure source---that's my question. $\endgroup$
    – user39728
    Commented Mar 25, 2021 at 16:23
  • $\begingroup$ No specific knowledge, but I would be surprised if it isn't high pressure bottles. $\endgroup$ Commented Mar 25, 2021 at 17:34
  • $\begingroup$ Yeah that's what I'm thinking too. I know nothing about how helium systems would work---not on a rocket and not on any other machine. I just know it'll need a pressure source, I guess. The legs are single-use (they deploy only once and that's it), so a precharge would probably be simpler and required fewer parts than alternatives (of which I won't pretend to know anything). Would love it if someone could confirm (or dispute) that the helium is precharged. $\endgroup$
    – user39728
    Commented Mar 25, 2021 at 17:59


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