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From: dil@mace.cc.purdue.edu (Perry G Ramsey)
Newsgroups: sci.space.shuttle
Subject: Re: hydrazine
Summary: A lot of them
Message-ID: <5987@mace.cc.purdue.edu>
Date: 7 Nov 90 18:39:02 GMT
References: <7565@eos.arc.nasa.gov>
Organization: Department of Earth and Atmospheric Sciences
Lines: 15

In article <7565@eos.arc.nasa.gov>, brody@eos.arc.nasa.gov (Adam R. Brody) writes:
> Anybody know in what vehicles hydrazine is used as a monopropellant?

Just about every US unmanned spacecraft these days uses monopropellant for
maneuvering fuel.  GOES, Hughes spin stabilized comm satellites, ERBS, come
to mind immediately.

Monopropellant is much simpler and cleaner than bipropellant.  Cleanliness
is important for spacecraft that have to last a long time.  The only
advantage of bipropellant is that it has a little higher Isp.
-- 
Perry G. Ramsey           Department of Earth and Atmospheric Sciences
perryr@vm.cc.purdue.edu   Purdue University, W. Lafayette, IN USA
dil@mace.cc.purdue.edu    Congress thinks that if you have nine women pregnant
			  simultaneously, you can get one baby in one month.