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From: nickw@syma.sussex.ac.uk (Nick Watkins)
Newsgroups: sci.space,sci.space.shuttle
Subject: Re: space news from June 18 AW&ST
Message-ID: <3334@syma.sussex.ac.uk>
Date: 23 Aug 90 17:44:27 GMT
References: <1990Aug9.051409.16353@zoo.toronto.edu>
Organization: University of Sussex
Lines: 28

From article <1990Aug9.051409.16353@zoo.toronto.edu>, by henry@zoo.toronto.edu (Henry Spencer):
 
> Second Titan 4 launched successfully June 8, carrying a spysat.  The
> USAF, which is basing its whole space plan on T4, is happy.  [Now that
> the USAF has its own launcher again, it has quietly forgotten its
> formerly-sacred rule that everything crucial had to be capable of going
> up on two different launchers.]  There is some concern about the one-year
> delay between first and second launches, but this is being ascribed to
> routine teething troubles of a new launcher.
I'm intrigued by said rule. What were backups for following ?

KH 11 (Titan 3D then 34D)
Chalet (Titan 3C then 34D)
Rhyolite (Atlas Agena D)
Navstar (Atlas then Delta II)
DSP (Titan 3C then Titan 34D)
DSCS (Titan 3C then 34D then Atlas II)
Magnum (Shuttle).

etc.

N.B. Second launchers here are not backups, they are replacements.

Nick
-- 
Dr. Nick Watkins, Space & Plasma Physics Group, School of Mathematical
& Physical Sciences, Univ. of Sussex, Brighton, E.Sussex, BN1 9QH, ENGLAND
JANET: nickw@syma.sussex.ac.uk   BITNET: nickw%syma.sussex.ac.uk@uk.ac