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- Newsgroups: sci.space
- Path: sparky!uunet!cs.utexas.edu!torn!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Re: SSTO vs 2 stage
- Message-ID: <C05BJJ.8vn@zoo.toronto.edu>
- Date: Thu, 31 Dec 1992 22:52:28 GMT
- References: <19069@mindlink.bc.ca>
- Organization: U of Toronto Zoology
- Lines: 26
-
- In article <19069@mindlink.bc.ca> Bruce_Dunn@mindlink.bc.ca (Bruce Dunn) writes:
- >> No, some of the S-IVB-based SSTO proposals were reusable...
- >
- > I stand corrected, although somewhat puzzled. If you have the details
- >handy Henry, could you inform us how it was planned to recover a cylindrical
- >stage without having it break up the way the Shuttle ET breaks up when it
- >hits the atmosphere? Presumably this must involve some mechanism for keeping
- >the stage oriented and tumble free during re-entry. What heat shield
- >materials were planned in this era prior to the Shuttle tiles and blankets?
-
- I don't have a lot of detail. The proposal I recall was in three phases.
- Phase one recovered an S-IVB with minimal modifications (ocean recovery
- using parachutes and retrorockets) as a demonstration, using the stage's
- existing RCS system plus three steel-mesh ballutes for nose-first
- stabilization, and ablative thermal protection. Phase two switched to
- land recovery, using landing legs plus crushable honeycomb behind the
- heatshield. Phase three did a substantial rebuild of the engine area
- to use an aerospike engine, which doubled as a liquid-hydrogen-cooled
- heatshield for tail-first reentry. After phase three successfully
- demonstrated an engine suitable for SSTO operations and a fully-reusable
- recovery mechanism, an operational SSTO vehicle would be developed
- using lighter structures etc. (The version I saw sounded like they
- weren't sure a direct S-IVB derivative could achieve SSTO itself.)
- --
- "God willing... we shall return." | Henry Spencer @ U of Toronto Zoology
- -Gene Cernan, the Moon, Dec 1972 | henry@zoo.toronto.edu utzoo!henry
-