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OP From transcript of a space mission:
[Cernan - "At ignition, the tanks were about three quarters full of fuel and one quarter pressurized helium. The trouble was that, in zero gravity, you didn't know where the fuel was in the tank. Therefore, you had to apply a little acceleration and drive the heavy (that is, denser) fuel downward towards the outlet, towards the engine, so that, when you started the main engine you don't get a fistful of helium. Because we were flying with the landing gear and the main engine forward, to get proper ullage we had to fire the RCS jets briefly against that forward motion. We had the computer programmed to fire the thrusters for a few seconds prior to ignition; but, if Jack hadn't confirmed ullage, I would have used the handcontroller to give us manual ullage."
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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