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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!rpi!gatech!gatech!wa4mei!ke4zv!gary
- From: gary@ke4zv.uucp (Gary Coffman)
- Newsgroups: sci.space
- Subject: Re: Latest Pegasus news?
- Message-ID: <1993Jan4.174720.11639@ke4zv.uucp>
- Date: 4 Jan 93 17:47:20 GMT
- References: <1992Dec27.203327.21241@iti.org> <1992Dec31.004513.12224@ke4zv.uucp> <ewright.725820266@convex.convex.com> <1992Dec31.182405.7430@iti.org>
- Reply-To: gary@ke4zv.UUCP (Gary Coffman)
- Organization: Destructive Testing Systems
- Lines: 39
-
- In article <1992Dec31.182405.7430@iti.org> aws@iti.org (Allen W. Sherzer) writes:
- >In <1992Dec31.004513.12224@ke4zv.uucp> gary@ke4zv.uucp (Gary Coffman) writes:
- >
- >>You misrepresent my position. All I'm saying is that new systems are
- >>rarely as cheap and easy in metal as they are on paper.
- >
- >Gary, I refer you to my recent posting where I compared DC costs to
- >Shuttle costs. I encoumbered DC with development costs but not Shuttle.
- >I doubled DC's DDT&E, production and operations costs. It still came up
- >a winner.
- >
- >Nobody is saying it will be a piece of cake. Are you saying that a factor
- >of two isn't enough to cover the risk? If not, then what's your point?
-
- Yeah, I'm saying a factor of two isn't enough to cover the likely
- stretchout in the development timeline as problems appear. I said
- in the other post that realistic numbers based on other new spacecraft
- development programs would be a tripling of MacDD's projected base costs
- and a tripling of their projected development timeline. That would still
- be cheaper than the monsterous delays and costs of Shuttle development.
- I think *everyone* agrees that the Shuttle development program was about
- as badly managed as is possible while still getting a working system in
- the end. Even if that system is mostly bandaids on top of bandaids that
- have to be torn down and inspected after every flight. At least it flys.
- I think comparisons to new airliner construction, such as the references
- to the progression of the 7xx series, is bogus because SSTO is attempting
- something no other craft has ever done, with an engineering tean that has
- no experience with similar reusable spacecraft to draw on. I don't expect
- them to make major mistakes, like mounting the engines upside down, as
- happened in a California nuclear power plant, but I do expect them to be
- bitten by numerous smaller gotchas as the program progresses. Each of those
- will cause schedule slips and additional development time.
-
- Gary
- --
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