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From: frank@bigdog.engr.arizona.edu (Frank Manning)
Subject: Re: Papers on the Ariane-5 crash and Design by Contract
Date: 1997/03/23
Message-ID: <5h22cr$c5m$1@news.ccit.arizona.edu>#1/1
X-Deja-AN: 228041925
References: <332B5495.167EB0E7@eiffel.com> <858850191snz@nezumi.demon.co.uk>
 <5gssgv$bei@news.ccit.arizona.edu> <858933630snz@nezumi.demon.co.uk>
Organization: College of Engineering and Mines, University of Arizona
Newsgroups: 
 comp.lang.eiffel,comp.object,comp.software-eng,comp.programming.threads,comp.lang.ada
Date: 1997-03-23T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <858933630snz@nezumi.demon.co.uk> Martin@nezumi.demon.co.uk
(Martin Tom Brown) writes:

> My point is that a primitive hardware based accelerometer could 
> have kept the thrust on average parallel to the velocity for
> quite a lot longer once the main guidance system was wrecked.
> It wouldn't be injected on the right orbit, but it wouldn't
> self destruct quite so easily either.

OK -- I see your point. A 2-axis accelerometer could measure the
sideways acceleration generated by a non-zero angle of attack. You
could use that information to steer the engines and prevent the
vehicle from flying sideways w/r/t the air mass. Might work.

-- Frank Manning