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Date:  9-26-2017
Number of Hours:  0.00
Manual Reference:  
Brief Description:  Flight Test #7

Flight test #7 was completed on September 26.

The purpose of this flight was to test fly a predefined triangular flight plan with five mile legs, to check its suitability as a pattern for checking I.A.S. vs. gps derived T.A.S.

The second purpose for this flight was to check the autopilot tuning and its effects on flying the triangular test-flight plan.

The third purpose of this flight was to determine the effects of a modified rudder trim wedge.

It took several laps around the triangular track to figure out how to correctly engage the autopilot for the first leg of the flight plan. After several attempts, I discovered what I was doing wrong, and everything fell into place. I determined the flight plan will work well for the upcoming I.A.S. calibration test flights. This plan will be flown at airspeeds from 60 to 170 mph in 10 mph increments.

I had previously turned up the “roll gain” on the A.P. to make the turns a little crisper. During this flight the A.P. was producing a mild rocking of the wings at cruise speed, so the “roll gain” was turned down slightly after the flight.

The rudder trim wedge was changed from a 6” long, 4” high, ¾” thick wedge, to a 1-5/8” long, 6” high, ¾” thick wedge. I felt the 6” length was unnecessary. This flight proved the shorter length to be completely adequate, but the 6” height was too much, overcorrecting.
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Original Rudder Trim Wedge

Original Rudder Trim Wedge

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Rudder Trim Wedge #2

Rudder Trim Wedge #2

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