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From: jlg@lanl.ARPA
Newsgroups: net.aviation
Subject: Re: aviation calculators
Message-ID: <17293@lanl.ARPA>
Date: Tue, 4-Dec-84 12:30:44 EST
Article-I.D.: lanl.17293
Posted: Tue Dec  4 12:30:44 1984
Date-Received: Thu, 6-Dec-84 06:42:08 EST
References: <128@anwar.UUCP> <208@terak.UUCP>
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Distribution: net.general
Organization: Los Alamos National Laboratory
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> The only aviation calculator that I've seen that would have
> been worthwhile was made by Heathkit a number of years ago.  It
> included a clock, and would accept up to 9 checkpoints and
> a flight plan.  As you passed over each checkpoint, you punched
> a button and the calculator would figure out how long the preceding
> leg took.  This information, combined with the heading that you
> had to hold to get where you were going, allowed the calculator
> to figure out what the wind must have been, and then would
> extrapolate the following legs of the flight plan based on that
> wind.  Then it could give you neat info like ETA at each
> checkpoint, groundspeed, fuel remaining, etc.

That's easy.  I programmed my HP-41CV to do that months ago, and I'm not
even a pilot (yet).  Of course, only 9 checkpoints won't make it past 
a cross country check ride.  My instructor wanted checkpoints every five 
minutes!