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- Newsgroups: sci.space
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Saturn lift capabilities
- Message-ID: <Bzuvrp.9z9@zoo.toronto.edu>
- Date: Sat, 26 Dec 1992 07:35:48 GMT
- References: <h0l2prg@rpi.edu> <ewright.724543661@convex.convex.com> <phfrom.413@nyx.uni-konstanz.de> <1h2egpINNmk9@mirror.digex.com> <1992Dec23.192920.7268@nntpd.lkg.dec.com> <23DEC199220530775@judy.uh.edu>
- Organization: U of Toronto Zoology
- Lines: 40
-
- In article <23DEC199220530775@judy.uh.edu> wingo%cspara.decnet@Fedex.Msfc.Nasa.Gov writes:
- >>... The Saturn 1B could lift the CSM or the LM, but not both (i.e. it
- >>could not carry the full Saturn V payload to LEO).
- >
- >From my information this was always the program intent of the Saturn 1B. This
- >helped to lower the costs for the test program of the full Saturn V by flying
- >most of the Saturn V hardware before the big bird was ready. According to
- >folks here at MSFC the 1B could lift that weight...
-
- Dennis, please back this up with numbers. The references say that the
- 1B's orbital payload was circa 18 (metric) tons, which compares rather
- unfavorably with the total Apollo orbital weight of 45 tons. (It was
- closer to 50 tons at launch, with the escape tower and protective cover,
- but those were shed on the way up.) This is *not* a small discrepancy.
-
- Could it be that someone got confused because the 1B's available payload
- to orbit was circa 45000 *pounds* and the Apollo mass was circa 45000
- *kilograms*?
-
- >Remember that the ASTP payload was the full up CSM as well as the docking
- >adaptor and the launch was to a 51 degree inclination orbit. This easily
- >equals the weight of the Lunar Module in a 28.5 degree orbit.
-
- Uh, Dennis, the ASTP payload was *not* a "full up" CSM; indeed, it was
- the lightest CSM ever flown manned, because it needed almost no main-engine
- fuel for its mission. (In fact, it carried more RCS fuel than main-engine
- fuel.) It weighed 12.7 tons.
-
- Furthermore, the docking adapter was tiny, weighing only 2 tons. The
- combination weighed about as much as Apollo 7's CSM, and only about 800kg
- less than the Skylab CSMs (which were also launched into high-inclination
- orbits, and at higher altitudes to boot).
-
- With tanks *empty*, a CSM-LM combination might just have been able to go
- up on a 1B. But that configuration couldn't have flown a useful mission.
- The Apollo 9 Earth-orbit-test CSM-LM stack weighed 36 tons, far beyond
- the 1B's lift capability.
- --
- "God willing... we shall return." | Henry Spencer @ U of Toronto Zoology
- -Gene Cernan, the Moon, Dec 1972 | henry@zoo.toronto.edu utzoo!henry
-