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the claim
S-IVB ullage motors shut down prior to main engine ignition once proper propellant settling was achieved
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
2 sources for · 0 against
AS REPORTEDno primary record reached; this is what the reporting says

Evidence indicates that ullage rockets were fired prior to engine ignition to settle propellants in the S-IVB stage tanks.

Evidence for · 2
Wikipedia: S-IVB
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Judged against reference works: claims of this kind are settled by the historical reference record, not journal abstracts.

More for · 1
Wikipedia: Rocketdyne J-2
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Reference article covering this claim directly
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 7504 Aug 2026
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