home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!roberts@cmr.ncsl.nist.gov
- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Newsgroups: sci.space
- Subject: Re: Fabrication
- Message-ID: <C0Dsxz.9yB.1@cs.cmu.edu>
- Date: 5 Jan 93 12:48:22 GMT
- Article-I.D.: cs.C0Dsxz.9yB.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Lines: 38
- Approved: bboard-news_gateway
- X-Added: Forwarded by Space Digest
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
-
-
- -From: henry@zoo.toronto.edu (Henry Spencer)
- -Subject: Re: Fabrication (was fast track failures)
- -Date: 5 Jan 93 00:39:01 GMT
- -Organization: U of Toronto Zoology
-
- -Moreover, there is a deeper issue here. Yes, having the engineers out
- -of tune with metal-bending is a bad thing when the objective is to
- -manufacture something. It's worse, though, when they're trying to
- -*develop* something.
-
- -Gary's comments (the >>> above) are squarely in the NASA mold: if you
- -do it right on paper, it will work the first time (although of course
- -you test it just in case). Unfortunately, the real world doesn't work
- -that way, as witness any number of NASA projects that *didn't* work
- -the first time. Real-world development involves *finding out* what
- -works and what doesn't... and you cannot do that on paper. You have
- -to test things *during* the engineering, not just afterward.
-
- Relevant to the discussion, I thought at least the major components of
- the Shuttle were tested to some extent before STS-1. Perhaps not as much
- as they could have been, but I remember all the SRB ground tests, all the
- burned/exploded SSMEs, the glide tests of Enterprise, etc.
-
- It probably wasn't practical to test some of the components (i.e. the ET)
- except in actual flight. I suppose the thermal tiles could have been tested
- on an unmanned capsule before the first flight of the Shuttle.
-
- There is perhaps still some debate on whether STS-1 should have been unmanned.
- I'd say that from an economic viewpoint, if the presence of humans could
- significantly improve it's chances of safe return, then it was worthwhile to
- have it manned. The Soviets didn't have that option with Buran - for
- political reasons, it had to launch sometime around the first post-Challenger
- Shuttle launch, and it didn't have life support (or onboard power other than
- batteries).
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-