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Re: GPS Calibration of ASI

Subject: Re: GPS Calibration of ASI
From: Rowland & Wilma Carson <rowil@clara.net>
Date: Wed, 20 Sep 2000 22:28:15

>Found out why  ftp://avnet.co.uk/pub/europa wasnt working, should be:
>ftp://www.avnet.co.uk/pub/europa

I find <ftp://ftp.avnet.co.uk/pub/europa> works OK for me - but I use 
a dedicated ftp tool, Fetch.

>however, i have an improved version for excel

I made a spreadsheet version of the formulae that appeared in Popular 
Flying, expanding it to 4 tracks with 4 sets of derivations and 
averaging of results, and even constructed a test data generator to 
make sure I'd done it right.

However, I did wonder about how easy it might be to fly those tracks 
exactly orthogonal to each other, and idly thought about the general 
case of several non-orthogonal tracks, but without applying enough 
mental effort to cause any output.

I later found that someone else had done a similar thing for the case 
of flying 3 HEADINGS at right angles. That seemed at first sight 
easier to do than fly tracks.

Then I came across Doug Gray's solution for the general case of any 3 
headings/tracks. I have now lost his website address, but still have 
his e-mail address, so will try to get in touch with him to see if he 
will allow publishing his solution on the Europa ftp site or at least 
provide a pointer to his website, where he had a nice description in 
a .PDF file and a simple implementation in Excel.

>  with some more bits added such as climb/glide ratios and graphs.
>If nothing else it will impress the pfa when you send in your flight 
>test report...

Perhaps if you are willing we could put a copy of that on the ftp 
site too (send a copy to me or listmaster John Cliff 
<john@crixbinfield.freeserve.co.uk>. No point in re-inventing the 
wheel, and we certainly want to impress the PFA with how switched-on 
us Europa folk are ....

regards

Rowland

PFA 16532   EAA 168386   Young Eagles Flight Leader 017623
Europa builder #435 G-ROWI


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