Ancestors

Written by Winchell Chung ⚛🚀 on 2025-01-11 at 13:14

Mastodon spaceflight mass-mind, please come to my aid. My google-fu is failing me.

In the Apollo program, Saturn V’s S-II (second stage) employed four ullage motors situated on the aft interstage skirt. Additionally, the third S-IVB stage incorporated an Auxiliary Propulsion System designed for ullage purposes. These settled the fuel so the engines did not injest vapor and shred.

Question: why didn't the ullage motors need ullage motors?

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Written by Winchell Chung ⚛🚀 on 2025-01-11 at 14:15

Supplemental question:

Some references say that spacecraft can use attitude jets or reaction control systems for ullage. Why don't the attitude jets require ullage themselves? I know that they do not use huge turbines like the main engine, but they are not solid fuel.

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Written by Michael Carroll on 2025-01-11 at 14:32

@nyrath

Bladders were used for for the Apollo CSM RCS:

"Each tank consisted of an outer titanium-alloy shell, a Teflon bladder, and an aluminum standpipe. Helium pressurant entered the tank between the metal shell and the Teflon bladder, collapsed the bladder, and forced the propellant out of the bladder through the aluminum standpipe."

Source: https://ntrs.nasa.gov/api/citations/19730017174/downloads/19730017174.pdf

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Toot

Written by Winchell Chung ⚛🚀 on 2025-01-11 at 14:39

@neffo

Thank you!

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Descendants