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GalinHdz
Joined: 08 Nov 2017
Posts: 150
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 Posted: Sat Oct 16, 2021 4:02 pm Post subject: TAS Calculations |
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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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TRUE_AIRSPEED_CALC.xls |
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210 Time(s) |
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dadmeyers1951(at)gmail.co
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| Posted: Sat Oct 16, 2021 6:02 pm Post subject: TAS Calculations |
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Neat capability!
On Sat, Oct 16, 2021, 7:03 PM Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)> wrote:
| Quote: | 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.
|
| | - The Matronics KIS-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?KIS-List |
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GalinHdz
Joined: 08 Nov 2017
Posts: 150
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| Posted: Sun Oct 17, 2021 7:52 am Post subject: TAS Calculations |
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I forgot to add, make sure you write down what your EFIS TAS display was during the flight procedure. Otherwise you have nothing to compare with.
On Saturday, October 16, 2021, Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)> wrote:
| Quote: | 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.
|
| | - The Matronics KIS-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?KIS-List |
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