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OP I could not think of any use for the word "ullage" until I found this on the Internet"
Basically, the ullage is the gaseous part of a container when partially
filled with a liquid. A sealed soda bottle has a small ullage of C02 at
the top. Rocket tanks often contain a pressurized ullage of helium to help
deliver the propellant to the engine under pressure. And helium is often
chosen because it's light and non-reactive.
In zero-G, there is no "top" for the ullage to rise to, so prior to an
engine restart, small jets give the rocket a small boost forward which
allows the liquid propellant to settle back to the bottom of the tank.
John Broman
Beginner satellite observer
Professional rocket builder
Entire Thread Subject Posted By Posted ullage wwh 05/05/01 12:43 AM Re: ullage wwh 05/05/01 12:57 AM Re: ullage Anonymous 05/05/01 01:08 AM Re: ullage Capital Kiwi 05/05/01 04:18 AM Harrumph® AnnaStrophic 05/05/01 11:27 AM Re: Harrumph® Jackie 05/05/01 12:40 PM Re: ullage inselpeter 05/09/01 08:05 PM Re: ullage tsuwm 05/05/01 05:27 PM Re: ullage wwh 05/05/01 07:11 PM Re: ullage Capital Kiwi 05/05/01 07:23 PM Re: ullage tsuwm 05/05/01 11:00 PM Re: ullage wwh 05/06/01 02:03 AM Re: ullage Max Quordlepleen 05/06/01 04:52 AM Re: ullage wwh 05/06/01 12:34 PM Re: ullage Jackie 05/06/01 04:10 PM Re: ullage / dregs wow 05/06/01 04:26 PM Re: ullage Max Quordlepleen 05/06/01 08:47 PM Re: ullage wwh 05/06/01 09:20 PM Re: ullage Max Quordlepleen 05/06/01 09:24 PM Re: "shift happens" AnnaStrophic 05/06/01 10:37 PM Re: ullage tsuwm 05/06/01 09:09 PM Re: ullage Bobyoungbalt 05/07/01 07:56 PM Re: ullage Anonymous 05/07/01 08:59 PM Re: ullage Bobyoungbalt 05/08/01 07:37 PM Re: an antonym for ullage tsuwm 05/08/01 08:35 PM Re: ullage AnnaStrophic 05/08/01 08:37 PM Re: fullage tsuwm 05/08/01 08:40 PM Re: fullage of troy 05/09/01 12:56 PM Re: fullage rodward 05/09/01 01:37 PM Re: fullage of troy 05/09/01 02:10 PM Re: tare wwh 05/09/01 03:18 PM Re: tare Bobyoungbalt 05/09/01 06:21 PM Re: tare inselpeter 05/09/01 07:56 PM Re: fullage Bobyoungbalt 05/09/01 06:32 PM Re: fullage Faldage 05/09/01 07:32 PM Re: Fullage Faldage 05/09/01 12:06 PM Re: ullage Faldage 05/07/01 11:44 AM Re: ullage Jackie 05/06/01 12:43 AM Re: ullage Flatlander 05/10/01 03:14 PM Re: ullage Bean 05/10/01 03:55 PM Re: ullage Faldage 05/07/01 11:18 AM
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