Questions tagged [helium]

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7
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2answers
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In what ways is helium used on modern launch vehicles?

Helium is a fairly rare material and does not remain in the atmosphere. I'd like to know the uses of helium on modern launch systems? Do most launch vehicles use helium in several different ways, or ...
3
votes
2answers
398 views

Is helium used to power the Falcon 9 grid fins?

Is helium used as a hydraulic fluid to power the grid fins? Or for engine gimbaling? What are the pros and cons of using helium instead of hydraulic fluids?
7
votes
2answers
2k views

Why Use Helium?

I apologize in advance if this question has already been asked and answered elsewhere, but why do RP-1/LOX rocket systems use helium for propellant tank pressurization? I understand the fact that O2 ...