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edit- Ullage space fills with gas evaporated from the bulk of the liquid fuel. Ullage motors burn this gas.
I replaced the above text because it appears to be inaccurate based on the web reference I found. Ray Spalding 21:07, 22 Dec 2004 (UTC)
Maybe someone with more specific knowledge in this area can say if this article should be merged with Ullage engine. Qutezuce 04:25, 9 January 2006 (UTC)
Photo?
editIsn't the photo actually the APS (Auxiliary Propulsion System), the S-IVB's reaction control system? While it was used as an ullage motor for the translunar injection, the proper ullage motors for the first burn were a separate unit.NelC (talk) 11:19, 1 December 2018 (UTC)
- You are absolutely correct. And there's even another error: the picture (uploaded to Commons by a German national who may not understand) doesn't even look like the correct APS that was used on the Saturn V; it looks like the one used on the Saturn IB, which was a bit smaller than the Saturn V version. A better ullage motor picture needs to be found, but for now I corrected the caption to explain "it's like what we want to show." JustinTime55 (talk) 19:45, 5 December 2018 (UTC)
- Correction: the original Flickr poster was the German national; the Wikimedia user who uploaded it to Commons was banned from Wikipedia for sockpuppetry! JustinTime55 (talk) 19:57, 5 December 2018 (UTC)