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- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Newsgroups: sci.space
- Subject: Re: SSTO vs 2 stage
- Message-ID: <C025yp.A1.1@cs.cmu.edu>
- Date: 30 Dec 92 05:58:38 GMT
- Article-I.D.: cs.C025yp.A1.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Lines: 37
- Approved: bboard-news_gateway
- X-Added: Forwarded by Space Digest
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-
-
- -From: ewright@convex.com (Edward V. Wright)
- -Subject: Re: SSTO vs. 2 Stage
- -Date: 29 Dec 92 19:46:24 GMT
- -Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
-
- -In <18892@mindlink.bc.ca> Bruce_Dunn@mindlink.bc.ca (Bruce Dunn) writes:
- -> We have been launching staged rockets for nearly half a century. I
- ->think the problems of staging, if not trivial, are solvable. Certainly,
- ->historical evidence indicates that staging is less of a technical challenge
- ->than SSTO operation.
-
- -You simply do not understand the difference between a converted
- -artillery rocket, which we have been launching for nearly half
- -a century, and a single-stage-to-orbit *spaceship*.
-
- -Saying that launch vehicles should be multistaged like ICBMs
- -makes as much sense as saying that airplanes should be shaped
- -like cannonballs.
-
- There's a very good argument for multistage rockets - it makes the mass
- ratio much simpler to manage (see some of the books by Willy Ley).
- Unfortunately, it also adds to the complexity and reliability problems of
- the launcher, which is why we'd like to go to SSTO if we can. Thanks to
- advances in technology, it may now be practical, and DC will be a great
- breakthrough if it works. But that doesn't mean designers were foolish to
- use multistage systems in the past - and some applications, such as direct
- flight to the moon without refueling, will probably remain unattainable by
- SSTO for a long time.
-
- What Bruce is proposing is in part a way to save the situation if SSTO DC
- turns out to be *not quite* practical, or if at some point we want to use
- DC hardware to put large payloads into orbit without building a large DC.
- His argument *supports* further development of DC.
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-