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Subject: Re: [LML] Re: Gap Seals [GPS speeds to KTAS]
From: Michael Newman <mnewman@dragonnorth.com>
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Computing True Airspeed

The spreadsheet
AirspeedFromThreeTracks.xls<http://www.dragonnorth.com/AirspeedFromThreeTracks.xls>Computes
the actual true airspeed of a plane given three GPS tracks taken
at the same airspeed. Given three GPS tracks at the same airspeed you can
compute a complete solution for the heading on each track and the TAS. The
spreadsheet contains actual data taken at low altitude in Lancair IV-P
N776CM. Additional data will be added to the spreadsheet as it is collected
for other altitudes.


On Tue, Dec 10, 2013 at 4:07 PM, Craig Jimenez <cj@awlbiz.com> wrote:

> Chris & Hamid,
>
> Using similar ideas to take wind out of the picture, Ed Williams
> (references below) derived the equations for an easy to fly method.  Hold
> 3 headings separated by 120-deg, measure GPS ground-speed -> true
> airspeed:
>
>   http://williams.best.vwh.net/avform.html#3gs
>
> He also converts IAS to TAS even when Mach is not negligible (good for
> finding calibration issues with OAT & airspeed):
>
>   http://williams.best.vwh.net/avform.htm#Mach
>
> I put both into a spreadsheet that works on computers and iPads:
>
>   http://www.beechtalk.com/forums/viewtopic.php?f=3&t=49840&start=400
>
> --
> Craig
>
>
>
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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<div dir=3D"ltr"><h2>Computing True Airspeed</h2>

<p>
The spreadsheet <a href=3D"http://www.dragonnorth.com/AirspeedFromThreeTrac=
ks.xls">AirspeedFromThreeTracks.xls</a>
Computes the actual true airspeed of a plane given three GPS tracks
taken at the same airspeed. Given three GPS tracks at the same
airspeed you can compute a complete solution for the heading on each
track and the TAS. The spreadsheet contains actual data taken at low
altitude in Lancair IV-P N776CM. Additional data will be added to the
spreadsheet as it is collected for other altitudes.
</p></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On =
Tue, Dec 10, 2013 at 4:07 PM, Craig Jimenez <span dir=3D"ltr">&lt;<a href=
=3D"mailto:cj@awlbiz.com" target=3D"_blank">cj@awlbiz.com</a>&gt;</span> wr=
ote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Chris &amp; Hamid,<br>
<br>
Using similar ideas to take wind out of the picture, Ed Williams<br>
(references below) derived the equations for an easy to fly method. =A0Hold=
<br>
3 headings separated by 120-deg, measure GPS ground-speed -&gt; true<br>
airspeed:<br>
<br>
=A0 <a href=3D"http://williams.best.vwh.net/avform.html#3gs" target=3D"_bla=
nk">http://williams.best.vwh.net/avform.html#3gs</a><br>
<br>
He also converts IAS to TAS even when Mach is not negligible (good for<br>
finding calibration issues with OAT &amp; airspeed):<br>
<br>
=A0 <a href=3D"http://williams.best.vwh.net/avform.htm#Mach" target=3D"_bla=
nk">http://williams.best.vwh.net/avform.htm#Mach</a><br>
<br>
I put both into a spreadsheet that works on computers and iPads:<br>
<br>
=A0 <a href=3D"http://www.beechtalk.com/forums/viewtopic.php?f=3D3&amp;t=3D=
49840&amp;start=3D400" target=3D"_blank">http://www.beechtalk.com/forums/vi=
ewtopic.php?f=3D3&amp;t=3D49840&amp;start=3D400</a><br>
<br>
--<br>
Craig<br>
<br>
<br>
<br>
<br>
--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists/lml/L=
ist.html</a><br>
</blockquote></div><br></div>

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