---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Sat 10/16/21: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:02 PM - TAS Calculations (Galin Hernandez) 2. 07:02 PM - Re: TAS Calculations (Glenn) ________________________________ Message 1 _____________________________________ Time: 05:02:35 PM PST US From: Galin Hernandez Subject: KIS-List: 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 _____________________________________ Time: 07:02:43 PM PST US From: Glenn Subject: Re: KIS-List: TAS Calculations Neat capability! On Sat, Oct 16, 2021, 7:03 PM Galin Hernandez 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. > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kis-list Browse Digests http://www.matronics.com/digest/kis-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.