Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Mon, 7 Jan 1991 00:13:36 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Mon, 7 Jan 1991 00:13:04 -0500 (EST) Subject: SPACE Digest V13 #009 SPACE Digest Volume 13 : Issue 9 Today's Topics: Re: Speaking of docking... Re: Air pressure questions (A human being in vacume) NASA Headline News for 12/28/90 (Forwarded) Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 28 Dec 90 17:37:11 GMT From: brody@eos.arc.nasa.gov (Adam R. Brody) Organization: NASA Ames Research Center, California Subject: Re: Speaking of docking... References: <1990Dec27.191147.21788@eagle.lerc.nasa.gov> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu lvron@saturn.lerc.nasa.gov (Ronald E. Graham) writes: >I need to be steered toward some references regarding docking operations. >Specifically, what I am interested in is the "feathering" of flexible and/ >or sensitive parts of the dock spacecraft in order to prevent/minimize >plume impingements or other nasty disturbances induced by the chaser craft. >Any references received will be greatly appreciated. They will be used to >help me with my doctoral dissertation. If there is any appreciable response, >I will gladly summarize for the benefit of interested newsgroup readers. >Happy holidays. >RG I have been researching the manual control aspects of docking operations (control modes, braking gates...) for about six years including 2 masters theses. I know this info is not quite what you wanted but I thought I would offer. ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 28 Dec 90 21:26:25 GMT From: cs.utexas.edu!news-server.csri.toronto.edu!utzoo!henry@tut.cis.ohio-state.edu (Henry Spencer) Organization: U of Toronto Zoology Subject: Re: Air pressure questions (A human being in vacume) References: <1990Dec11.111010.22953@unicorn.cc.wwu.edu>, <1990Dec11.174058.11948@zoo.toronto.edu>, <788@npdiss1.StPaul.NCR.COM> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In article <788@npdiss1.StPaul.NCR.COM> mercer@npdiss1.StPaul.NCR.COM (Dan Mercer) writes: >Astronauts used a low pressure pure oxygen atmosphere until the tragic >Apollo fire which cost three astronauts their lives. The fire would >not have happened in a normal atmosphere situation. Subsequent >research indicated that there was no real demanding reason for the use >of pure oxygen. On the contrary, in space there were important reasons for it: simple plumbing and control systems, spacesuits in which human beings could actually move, and light low-pressure structure. Which is why it was kept for in-space use for the rest of the Apollo program. The post-fire changes affected only the gas mix used on the pad (and in the first minute or so of flight), when it was essential that internal pressure be relatively high. The error that caused the fire was not the use of low-pressure pure oxygen in space, but the use of high-pressure pure oxygen on the pad. Skylab (I think) and the Shuttle (definitely) have opted for mixed-gas atmospheres for various secondary reasons, at the price of heavier and more complex life-support systems and long prebreathing delays before EVAs. The spacesuits still use low-pressure pure oxygen. -- "The average pointer, statistically, |Henry Spencer at U of Toronto Zoology points somewhere in X." -Hugh Redelmeier| henry@zoo.toronto.edu utzoo!henry ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 28 Dec 90 22:32:22 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Organization: NASA Ames Research Center, Moffett Field, CA Subject: NASA Headline News for 12/28/90 (Forwarded) Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu Headline News Internal Communications Branch (P-2) NASA Headquarters Friday, December 28, 1990 Audio Service: 202 / 755-1788 This is NASA Headline News for Friday, December 28, 1990 The Magellan spacecraft continues to be in good health and is operating nominally. The scheduled switch over to the single radar data tape recorder occurred on Dec. 22 and the new command sequence using the single tape recorder has been running fine this week. Magellan controllers decided to turn off Recorder A because of an increasingly high error rate. In early 1991, controllers will decide whether to stay in the single tape recorder strategy or go back to the original two-tape recorder plan. Magellan had a very quite Christmas and a smaller than average holiday ground crew is preparing the next normal, multi-day command sequence that will be sent to the spacecraft tomorrow. This command load contains normal operating procedures and it becomes active on Saturday. * * * * * * * * * * * * * * * * * * * * * * * * * * Following are the scheduled NASA and related events for 1991 calendar year: March STS-39 DOD mission on Discovery, crew of 7 for 8 days; Scout launch of Navy Profile satellite from WSMC; April STS-37 GRO deploy mission on Atlantis, crew of 5 for 5 days; Magellan concludes its 243 day mapping mission of Venus (4/28) May STS-40 SLS-1 Spacelab mission on Columbia, crew of 7 for 9 days; Atlas launch of NOAA-D from WSMC; July STS-43 TDRS deploy mission on Discovery, crew of 5 for 9 days; August STS-44 DSP deploy mission on Atlantis, crew of 5 for 10 days; Delta launch of EUVE from ESMC; October Galileo flies by the asteroid Gaspra (10/29) November STS-48 UARS deploy on Discovery, crew of 5 for 5 days; December STS-42 IML-1 Spacelab mission on Atlantis, crew of 7 for 7 days; Atlas launch of NOAA-I from WSMC; Ulysses flies by Jupiter (late December/early January 1992). * * * * * * * * * * * * * * * * * * * * * * * * * * The next edition of NASA Headline News will be on Wednesday, January 2. The next scheduled programming to air on NASA Select TV will also be on Jan. 2. In the meantime, have a pleasant New Year holiday and please, please, don't drink and drive. ------------------------------ End of SPACE Digest V13 #009 *******************