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 ; Thu, 8 Mar 90 02:13:13 -0500 (EST) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Thu, 8 Mar 90 02:12:45 -0500 (EST) Subject: SPACE Digest V11 #125 SPACE Digest Volume 11 : Issue 125 Today's Topics: Re: Thiokol wasn't punished (was Re: Fun Space Fact #1) APU Exhaust NASA Headline News for 03/06/90 (Forwarded) Re: hubble telescope power Re: hubble telescope power ---------------------------------------------------------------------- Date: 6 Mar 90 20:23:46 GMT From: zephyr.ens.tek.com!tektronix!sequent!cliffw@beaver.cs.washington.edu (Cliff White) Subject: Re: Thiokol wasn't punished (was Re: Fun Space Fact #1) In article <9002282308.AA26663@aldrin.cray.com> lfa@VIELLE.CRAY.COM (Lou Adornato) writes: % %Thiokol had more experience than anyone else with the SRB's, and it just %wouldn't make sense to add some other company's learning curve time to the %inevitable program suspension. As for shelving the secon source SRB supplier, Who builds SRB's for Titan? As i recall, Thiokol was only one of several experienced sources bidding when the program started. %Also, the cost of bringing a second source on line is pretty high, and NASA %had to buy a whole new orbiter. There's also the matter of whether Thiokol %could have remained solvent through the redesign effort if NASA hadn't made a %commitment (Thiokol stock was probably pretty low at the time). % % Does the USG have an obligation to keep bad vendors in buisness? % %Lou Adornato | Statements herein do not represent the opinions or attitudes %Cray Research | of Cray Research, Inc. or its subsidiaries. %lfa@cray.com | (...yet) -- cliffw 'If we can't fix it- we'll fix it so nobody can'- B. Gibbons ------------------------------ ReSent-Message-ID: <4ZxEIPe00VRhIB7ycv@andrew.cmu.edu> ReSent-Date: Wed, 7 Mar 90 07:56:59 -0500 (EST) ReSent-From: "Todd L. Masco" ReSent-To: Space Sender: "Jack_Bacon.WBST897ai"@Xerox.COM Date: 1 Mar 90 05:59:10 PST (Thursday) Subject: APU Exhaust From: "Jack_Bacon.WBST897ai"@Xerox.COM Cc: "Jack_Bacon.WBST897ai"@Xerox.COM In the spectacular Infra-red video of the night landing of the Columbia-LDEF mission, one prominent feature was the steady and strong plume of APU exhaust, which jets vertically on either side of the vertical stabilizer/tail assembly. It strikes me that this exhaust plume must be there throughout the time that the APU's are running during the descent. Since these are started up long before atmospheric effects start to dominate the forces on the orbiter (The APU's are necessary to move the airelons & rudder), the question arises: >>Do the APU exhaust plumes cause any pitch-control problems? Ie, does the orbiter require active compensation from the pitch vernier thrusters to counter this ? Also, do they use the exhaust to help with the 180% pitch-over after the OMS burn, which is required in order to bring the nose forward for re-entry? Inquiring minds want to know. Thanks- Jack "Jack Bacon:wbst897ai:xerox".ns@Xerox.Com ------------------------------ Date: 6 Mar 90 20:07:36 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 03/06/90 (Forwarded) ----------------------------------------------------------- Tuesday, March 6, 1990 Audio: 202/755-1788 ----------------------------------------------------------- This is NASA Headline News for Tuesday, March 6...... The orbiter Discovery was rolled over from Kennedy Space Center's Orbiter Processing Facility to the Vehicle Assembly Building Monday where workers will lower and attach the lifting crane and hoist Discovery off the orbiter transporter. Rollout to launch Pad 39-B is scheduled for March 16 and launch is targeted for April 12 to deploy the Hubble Space Telescope. The orbiter Atlantis is reported to be in excellent condition with only one tile that needs to be replaced. Work at Dryden Flight Research Facility to prepare the Atlantis for the ferry trip back to Florida is currently delayed due to a high winds forecast. Officials are planning a one-day ferry flight back to the Kennedy Space Center pending good weather and completion of planned work. The New York Times reports the congressionally chartered National Research Council said nuclear power eventually will be essential for moon and Mars bases, as well as for the propulsion of spacecraft. The council also wants to study artificial gravity to identify the risks of prolonged exposure to weightlessness. The SR-71 left a crowd of observers at Palmdale, California at 9:01 Eastern standard time this morning to mark a record one hour and four minute coast-to-coast flight to Washington, D.C. While travelling at approximately 85,000 feet and over 2200 Miles per hour, the 25-year-old "Blackbird" went out in style before retiring at the Smithsonian as it broke the previous record of only 500 Miles per hour held by a Learjet. Orbital Sciences Corporation plans to deploy a global satellite system for data transmission. The Washington Times reports the Virginia-based company says domestic service could be in place as early as 1993. Subscribers will be able to use a calculator-size device to transmit and receive basic communication or emergency signals. #### ----------------------------------------------------------------- Here's the broadcast schedule for public affairs events on NASA Select TV. All times are Eastern. Thursday, March 8..... 11:30 A.M. NASA Update will be transmitted. Wednesday, March 21... 1 - 2:30 P.M. Total Quality Management in Action colloquium. All events and times are subject to change without notice. ---------------------------------------------------------------- These reports are filed daily, Monday through Friday, at 12 noon, Eastern time. ---------------------------------------------------------------- A service of the Internal Communications Branch (LPC), NASA Headquarters, Washington, D.C. ------------------------------ Date: 8 Mar 90 06:37:58 GMT From: agate!usenet@ucbvax.Berkeley.EDU (William Baxter) Subject: Re: hubble telescope power In article <3914@nmtsun.nmt.edu>, nraoaoc@nmtsun (Daniel Briggs) writes: >But but this into a $$ perspective. The Keck ten meter telescope was >originally funded for something about $80 million. (I think. My memory >has proved faulty before!) It is going to run a bit more expensive than >they had hoped, but that is still a good order of magnitude. I have no >idea what the current price tag is on Hubble (Henry?), but it is in the >many billions class. > >The moral I derive from this, is: Space is very expensive. An important refinement is in order for this conclusion: Space is very expensive the way that we do it now. William Baxter ARPA: web@{garnet,brahms,math}.Berkeley.EDU UUCP: {sun,dual,decwrl,decvax,hplabs,...}!ucbvax!garnet!web ------------------------------ Date: 8 Mar 90 06:40:02 GMT From: agate!usenet@ucbvax.Berkeley.EDU (William Baxter) Subject: Re: hubble telescope power In article <3914@nmtsun.nmt.edu>, nraoaoc@nmtsun (Daniel Briggs) writes: >But but this into a $$ perspective. The Keck ten meter telescope was >originally funded for something about $80 million. (I think. My memory >has proved faulty before!) It is going to run a bit more expensive than >they had hoped, but that is still a good order of magnitude. I have no >idea what the current price tag is on Hubble (Henry?), but it is in the >many billions class. > >The moral I derive from this, is: Space is very expensive. An important refinement of this conclusion is in order: Space is very expensive the way that we do it now. William Baxter ARPA: web@{garnet,brahms,math}.Berkeley.EDU UUCP: {sun,dual,decwrl,decvax,hplabs,...}!ucbvax!garnet!web ------------------------------ End of SPACE Digest V11 #125 *******************