home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!agate!rsoft!mindlink!a752
- From: Bruce_Dunn@mindlink.bc.ca (Bruce Dunn)
- Subject: Re: SSTO vs 2 stage
- Organization: MIND LINK! - British Columbia, Canada
- Date: Thu, 31 Dec 1992 03:30:01 GMT
- Message-ID: <19045@mindlink.bc.ca>
- Sender: news@deep.rsoft.bc.ca (Usenet)
- Lines: 27
-
- > Retarding SSTO, Edward V. Wright writes:
- >
- > Advances in technology, perhaps, but hardly recent advances. The old
- > Saturn S-IVB stage could've been turned into a SSTO launcher, with a
- > payload the size of a Gemini spacecraft. The "unattainable mass ratio"
- > is nothing more than an aerospace legend.
- >
-
-
- This somewhat confuses the issue, in that it tends to imply that the
- technology necessary to build a DC-1 was available a generation ago. The
- S-IVB derivative would be a ***non-reusable*** SSTO, which is a different
- animal than a ***reusable*** SSTO. In order to recover your hypothetical
- S-IVB vehicle, you will have to add equipment for recovery and landing,
- including a retrofire system, heat shielding, parachutes (or the fuel and
- throttable engines for a powered descent), landing gear (or waterproofing of
- all systems), etc. The extra mass will kill your payload.
-
- What is really hard is not making an SSTO, but making a "RRSSTO" or
- Recoverable Reusable Single Stage to Orbit which has enough payload to
- justify its costs (however accounted for).
-
-
-
-
- --
- Bruce Dunn Vancouver, Canada Bruce_Dunn@mindlink.bc.ca
-