Questions tagged [ullage]
Questions regarding the management and nature of gas is tanks otherwise filled with liquids.
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How might an internal combustion engine generate substantial external thrust?
This answer mentions the proposed use of an internal combustion engine (ICE) in ULA's ACES upper stage to extract energy from LH2/LOX in multiple forms for multiple uses, which is described further in ...
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What is and what isn't ullage in rocket science?
This comment and others below this answer address ullage.
"Ullage" basically just means "the portion of the tank that isn't filled with liquid". The extended rocket-science implications of ullage ...
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Are these sliding ullage bulkheads in the OTRAG rocket? How do they seal?
This answer to Were there any non-state organizations to organize space flight and colonizations in the second half of the 20th century? mentions OTRAG and links to Astronautix's OTRAG page.
The ...
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Why did the S-IV-B refer to "jettison"ing its ullage?
This is based on a recent question about S-IV-B ullage motor shutoff timing, specifically something found in the Technical Information Summary AS-501, page 15:
Ullage Jettison ~ 532.
But why "...
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What do the terms milli-g and microgravity mean? How are they used?
I've seen the terms "milli-g" acceleration and microgravity in many questions and answers here, within the context of spaceflight.
Does milli-g refer to accelerations between 0.001 $g_0$ and 1 $g_0$, ...
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Why did the ullage motors for the S-IVB TLI burn shut down prior to S-IVB ignition?
I found "Technical Information Summary AS-501: Apollo Saturn V Flight Vehicle" when looking for info about the Saturn V staging sequence. It contains a nice diagram on pages 14-16 showing the various ...
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How (the heck) will SpaceX's Starship's future pressure-fed thrusters work at "any gee’s, any attitude"?
In the SpaceX video Starship Update at about 57 minutes Tim Dodd the Everyday Astronaut asks about how the Starship rotates from reentry orientation to landing (vertical) and Musk explains that in the ...
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