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Data from flight test

This was a flight test in a C172M.

The barometric pressure sensor was installed in the probe. Due to an error of setup, the hoses to the yaw sensor were switched left/right from their usual orientation.

The probe was mounted slightly below the strut and on a direct vertical line downward from the Pitot tube, as illustrated below:

Probe mounting

Total Hobbs time was 1.7 hours. We targeted a peak altitude of 11,500 feet. At peak altitude, we measured a pressure altitude of 11,300 feet, at 0 degrees C and 83 KIAS.

At no time, including peak altitude, did we observe the TAS "ring" show up on the display. It is unclear if this is due to a bug in the software or whether the algorithm that hides that ring unless the TAS-IAS spread is large enough is too aggressive.

We planned to fly the software with the "beta bias" adjustment, but again due to a failure of setup we did not have that version installed. So instead we centered the inclinometer ball at different flight conditions, and noted where in the display the ball was situated. Our observation is below:

Yaw positions

In post-processing, and based on the display settings, we can determine the yaw variation between the different flight conditions. The settings file is included. Beta max was set at 300 counts which equates to +/- 15 degrees full scale.