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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: Re: Comparative $/lb to LEO (Was: Stupid Shuttle Cost Arguments)
- Message-ID: <C01E43.JIJ@zoo.toronto.edu>
- Date: Tue, 29 Dec 1992 19:57:36 GMT
- References: <n1351t@ofa123.fidonet.org> <neff.12.725643434@iaiowa.physics.uiowa.edu>
- Organization: U of Toronto Zoology
- Lines: 16
-
- In article <neff.12.725643434@iaiowa.physics.uiowa.edu> neff@iaiowa.physics.uiowa.edu (John S. Neff) writes:
- >It is common for the shuttle to fly without a full cargo. In your calculation
- >you assumed that the payload was the maximum for the orbit. You figures are
- >the lower limit to the cost per pound for the shuttle.
-
- This is true for all launchers, actually. It's not that rare for them to
- fly with less-than-maximum payload due to other constraints, e.g. payload
- volume, limits of deployment mechanisms, or a payload that simply doesn't
- want hitchhikers for whatever reason. It's somewhat more common for the
- shuttle only because most shuttle missions are to low orbit and a large
- fraction of non-shuttle missions are to Clarke orbit (where propulsion
- systems for stationkeeping are invariably needed, so it's possible to
- adjust fuel load to fully exploit the launcher).
- --
- "God willing... we shall return." | Henry Spencer @ U of Toronto Zoology
- -Gene Cernan, the Moon, Dec 1972 | henry@zoo.toronto.edu utzoo!henry
-