n9144p
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- Nov 4, 2015
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I read a few posts recently where people are wondering what their plane's speed actually is now and maybe after alterations. I used several methods, but came across this spreadsheet a few years ago. Dirt easy to use if you have any form of GPS.
Pick an altitude and power setting
Fly 3 directions by the GPS track (not magnetic).
Record the GPS ground speed - not your Indicated Air Speed
Put in the 6 numbers (3 runs of track/speed) and voila - you get winds aloft and your true airspeed.
Then if you get interested, you can try different altitudes, power settings, etc.
View attachment True Airspeed Excel Sheet.xls
Pick an altitude and power setting
Fly 3 directions by the GPS track (not magnetic).
Record the GPS ground speed - not your Indicated Air Speed
Put in the 6 numbers (3 runs of track/speed) and voila - you get winds aloft and your true airspeed.
Then if you get interested, you can try different altitudes, power settings, etc.
View attachment True Airspeed Excel Sheet.xls
