home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space
- Path: sparky!uunet!hela.iti.org!aws
- From: aws@iti.org (Allen W. Sherzer)
- Subject: Let's be more specific (was: Stupid Shut Cost arguements)
- Message-ID: <1992Dec28.202920.5932@iti.org>
- Organization: Evil Geniuses for a Better Tomorrow
- References: <STEINLY.92Dec23121415@topaz.ucsc.edu> <1992Dec23.212100.18194@iti.org> <1992Dec28.172953.26161@ke4zv.uucp>
- Date: Mon, 28 Dec 1992 20:29:20 GMT
- Lines: 54
-
- In article <1992Dec28.172953.26161@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
-
- >Shuttle's costs were all accounted for too. The customer, the US
- >taxpayer, wanted R&D done to develop a reusable spacecraft.
-
- OK Gary you win. I'll accept that there is nothing wrong with Governement
- engaging in activities which would get you or I put in jail. It's OK for
- NASA to spend $34 billion and then pretend they didn't.
-
- Under these rules, let's look at the costs. The follwoing cost are
- from a spreadsheet I put together to evaluate these costs. We get:
-
-
- Shuttle SSTO
- 1. Launches per year [1]: 10 10
- 2. Amortization years [2]: 30 10
- 3. Development costs [3]: 0 $3,000M
- 4. Production costs [4]: $1,500M $ 333M
- 5. Amortization costs: $ 66M $ 58M
- 6. Launch costs [6]: $ 550M $ 20M
- 7. Total launch cost (5 + 6): $ 616M $ 78M
- 8. Cost per pound to LEO: $10,272 $ 1304
-
- So even ignoring $34 billion in Shuttle costs AND doubling SSTO
- costs, SSTO comes out ahead. Even if you doubled Shuttle flight
- rates (which not even NASA pretends any more) and quadrupled
- all SSTO costs, SSTO still wins.
-
- [1] I used the number of Shuttle launches scheduled for this year and next.
- Doubling this number will not change the end result. For SSTO, I assume
- it takes 80% the domestic MLV market and that the market doesn't grow.
- I think both of these assumptions are unrealistic but it makes SSTO
- look worse.
-
- [2] Amortization happens over 30 years for Shuttle vs 10 years for SSTO.
- SSTO must recoup costs faster since competitors can be expected. Allowing
- SSTO more time will greatly reduce its costs.
-
- [3] Shuttle gets a free ride here. To keep Gary happy we won't worry about
- the $34 billion Shuttle development costs. To also keep Gary happy, we
- WILL amortize SSTO development costs and double those costs just in
- case.
-
- [4] Again, we use Gary's number for the cost of an orbiter. I have doubled
- the cost of an SSTO to add margin for error.
-
- [6] SSTO launch costs are again, double the estimated costs to add a margin.
-
- Allen
- --
- +---------------------------------------------------------------------------+
- | Allen W. Sherzer | "A great man is one who does nothing but leaves |
- | aws@iti.org | nothing undone" |
- +----------------------117 DAYS TO FIRST FLIGHT OF DCX----------------------+
-