Today's Message Index:
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1. 05:02 PM - TAS Calculations (Galin Hernandez)
2. 07:02 PM - Re: TAS Calculations (Glenn)
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| Subject: | TAS Calculations |
If you have an EFIS that displays TAS and want to check how accurate it is,
let me know. As long as you have ADS-B OUT and fly a standard route I can
provide what your TAS actually is.
The procedure is:
Fly at a constant altitude (like 4,500ft) at a constant power setting (like
65%) at three different GPS headings (like 360, 120, 240) in smooth air
conditions.
The actual power setting is not important. Keeping it constant and not
changing it during the entire flight is important. The actual altitude used
is not important. Keeping it constant and not changing it during the entire
flight is important. The actual GPS headings are not important but keeping
it constant and not changing it once you are established is important. Make
sure they are at least 90degrees from each other, 120degrees is best. Each
leg needs to be flown for at least 5 minutes after you are established.
Using a GPS driven autopilot for the heading results in the most accurate
heading data.
You can also just fly the procedure on your own, jot down the three GPS
Ground Speeds and GPS Headings. Then you can either send them to me for
calculation or use the attached EXCEL spreadsheet.
Many years ago when I did mine my EFIS and all it's calculations were off
by a lot. Once I figured out I had a problem, the fix was easy. Besides, I
get bored just flying around.
Message 2
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| Subject: | Re: TAS Calculations |
Neat capability!
On Sat, Oct 16, 2021, 7:03 PM Galin Hernandez <galinhdz@gmail.com> wrote:
> If you have an EFIS that displays TAS and want to check how accurate it
> is, let me know. As long as you have ADS-B OUT and fly a standard route I
> can provide what your TAS actually is.
>
> The procedure is:
> Fly at a constant altitude (like 4,500ft) at a constant power setting
> (like 65%) at three different GPS headings (like 360, 120, 240) in smooth
> air conditions.
>
> The actual power setting is not important. Keeping it constant and not
> changing it during the entire flight is important. The actual altitude used
> is not important. Keeping it constant and not changing it during the entire
> flight is important. The actual GPS headings are not important but keeping
> it constant and not changing it once you are established is important. Make
> sure they are at least 90degrees from each other, 120degrees is best. Each
> leg needs to be flown for at least 5 minutes after you are established.
> Using a GPS driven autopilot for the heading results in the most accurate
> heading data.
>
> You can also just fly the procedure on your own, jot down the three GPS
> Ground Speeds and GPS Headings. Then you can either send them to me for
> calculation or use the attached EXCEL spreadsheet.
>
> Many years ago when I did mine my EFIS and all it's calculations were off
> by a lot. Once I figured out I had a problem, the fix was easy. Besides, I
> get bored just flying around.
>
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