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 ; Sat, 10 Feb 90 01:47:15 -0500 (EST) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Sat, 10 Feb 90 01:46:54 -0500 (EST) Subject: SPACE Digest V11 #31 SPACE Digest Volume 11 : Issue 31 Today's Topics: Re: More Info On SSX Space Shuttle Question Re: Gravity Assist Mechanism Re: Space Station Costs Reminders for Old Farts SVR4 Re: Recreation in Space Re: Systeme International (was Imperial measurements) ---------------------------------------------------------------------- Date: 9 Feb 90 19:04:29 GMT From: pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!cs.utexas.edu!jarvis.csri.toronto.edu!utgpu!utzoo!henry@tut.cis.ohio-state.edu (Henry Spencer) Subject: Re: More Info On SSX In article <844@jethro.Corp.Sun.COM> jmck@norge.EBay.Sun.COM (John McKernan) writes: >>The first SSX will probably use RL-10 rocket engines... > >I remember the previous posting on the SSX said that it was to use an >"aerospike" design for its rocket motor. I believe the Centaur engine >does not use such a design... Since the aerospike is basically a variant nozzle design, rather than a change in the chamber, this is a relatively minor change to the engine. Some of the early aerospike concepts envisioned using modified versions of the Saturn's J-2 engine. -- SVR4: every feature you ever | Henry Spencer at U of Toronto Zoology wanted, and plenty you didn't.| uunet!attcan!utzoo!henry henry@zoo.toronto.edu ------------------------------ Date: 9 Feb 90 15:39:17 GMT From: ucsdhub!hp-sdd!hp-pcd!hpcvia!10e@ucsd.edu (Steven_Tenney) Subject: Space Shuttle Question Hello, I'm writing an sf story and I was wondering exactly what kind of fuels the space shuttle uses, from the booster rockets to the trajectories. How closely tied are these fuels to fossel fuels? How would the space shuttle program be effected if a major disaster occurred to the world wide oil supply (including space shuttle support services, etc.)? Thank you for any information ahead of time. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Steve Tenney | "I spied three ships Hewlett-Packard Corvallis, ORE| They were all sailin' my way. 10e@hpcvia.CV.HP.COM | I asked the captain of the first _ _|***|__ | ship what his name was and |_ _||| | how come he didn't drive a truck? ( ~~ ~~ ))) | he said his name was Columbus \ == /// | an' I just said 'Good Luck!'" ||||\\\ | -Bob Dylan ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------ Date: 9 Feb 90 18:44:30 GMT From: swrinde!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!nic.MR.NET!ns!logajan@ucsd.edu (John Logajan) Subject: Re: Gravity Assist Mechanism henry@utzoo.uucp (Henry Spencer) writes: >Gravity assist works like bouncing a ball off a car. If the car is moving >toward you at high speed (kids, don't try this at home :-)), the ball will >come back a lot faster than you threw it. At last, an intuitive explanation that I can understand. Thank you. It's all obvious -- now. -- - John Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428 - logajan@ns.network.com, john@logajan.mn.org, 612-424-4888, Fax 424-2853 ------------------------------ Date: 8 Feb 90 16:59:48 GMT From: mnetor!utzoo!henry@uunet.uu.net (Henry Spencer) Subject: Re: Space Station Costs In article <618@nikhefk.UUCP> greg@nikhefk.UUCP (Greg Retzlaff) writes: >The thing about the space station that has always made me >wonder, is WHY it is so expensive... Basically, because building and launching hardware is third priority, behind care and feeding of the NASA bureaucracy and care and feeding of the NASA contractors. This is why, for example, there is all this hoopla about the massive technological advances required, which is clearly bullshit since both the Soviets and the US have done this before using existing technology. The bulk of the money is simply being wasted on things that are utterly irrelevant to putting a space station into orbit. As witness Lawrence Livermore's belief that they could do a space station *and* a lunar base *and* a Mars base for the same amount of money, basically by using existing technology and putting the effort into getting the job done. -- SVR4: every feature you ever | Henry Spencer at U of Toronto Zoology wanted, and plenty you didn't.| uunet!attcan!utzoo!henry henry@zoo.toronto.edu ------------------------------ Date: Fri, 9 Feb 90 04:00:18 PST From: Eugene Miya Subject: Reminders for Old Farts Hints for old users (subtle reminders) You'll know these. Minimize cross references, [Do you REALLY NEED to?] Edit "Subject:" lines especially if you are taking a tangent. Send mail instead, avoid posting follow ups. [1 mail message worth 100 posts.] Read all available articles before posting a follow-up. [Check all references.] Cut down attributed articles. Summarize! Put a return address in the body (signature) of your message (mail or article), state institution, etc. don't assume mail works. Use absolute dates. Post in a timely way. Don't post what everyone will get on TV anyway. Some editors and window systems do character count line wrapping: please keep lines under 80 characters for those using ASCII terms (use ). ------------------------------ Date: Fri, 09 Feb 1990 09:07 EST From: SIMMONS DONALD F <27000%AECLCR.BITNET@vma.cc.cmu.edu> Subject: SVR4 To: In his latest signature, Henry Spencer writes >SVR4: every feature you ever wanted, > and plenty you didn't. Pardon me if my ignorance is showing, but what is SVR4? Donald Simmons 27000@aeclcr ------------------------------ Date: 9 Feb 90 16:46:56 GMT From: hplabsb!dsmith@hplabs.hp.com (David Smith) Subject: Re: Recreation in Space In article <1037@watserv1.waterloo.edu> a1wrkshp@watserv1.waterloo.edu (WATMOST Groups 9) writes: >Finally, do what would YOU like to do if you were a crewman on the Space >Station? Could zero gravity itself be entertaining enough, or would you >desire some form of activity? Can you suggest an object, such as a >gyroscope, that would be interesting to use in zero-g, and should be provided? First, what about physical activities? I'm the kind of person who dislikes calisthenics, and think an on-board treadmill could hardly be termed recreation. But some zero-G variant of handball ought to be a blast. For a quiet interesting activity, I'd like to be able to use a telescope. -- David R. Smith, HP Labs dsmith@hplabs.hp.com (415) 857-7898 ------------------------------ Date: 9 Feb 90 18:03:13 GMT From: bnrgate!bnr-fos!bmers58!pdbain@uunet.uu.net (Peter Bain) Subject: Re: Systeme International (was Imperial measurements) In article <900208.11501494.022633@RMC.CP6> JC@RMC.BITNET writes: >There are in fact several metric systems. The two most common are the >centimetre-gram-second, usually known as CGS, and the metre-kilogram- >second, officially known as SI (or as MKS by those who don't know better). > > >The Systeme International has only six base units (the metre, the kilogram, >the second, the Ampere, the Kelvin, and the candela) and about 20 >combination units (the Newton, etc). I am slightly confused about the candela. As I understand it, it is the unit of luminous intensity. Isn't this just watts/m**2? If so, then the candela is a redundant base unit. -peter ------------------------------ End of SPACE Digest V11 #31 *******************