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Date:  9-6-2017
Number of Hours:  0.00
Manual Reference:  
Brief Description:  Flight Test #5

Flight Test #5 was completed yesterday morning to take advantage of the short-lived calm air. The purpose of this test was to explore the effects of leaning, and check the effects of a radio wiring change to my headset.

During the previous flight test, without leaning, the engine was burning 7.4 gallons per hour at approximately 72% power. For this test, temporary markings were added to the throttle quadrant marking ten-percent increments of leaning lever position, with full rich being “0” percent.

After climbing to a density altitude of 4000 feet, the throttle was set to 3040 rpm with the leaning at zero percent, and the autopilot was engaged to keep it straight and level. After waiting for everything to settle, a snap of the EFIS Engine page was taken. The fuel flow was 7.0 gph.

Without changing anything but the heading to stay close to my home field, the mixture was leaned to the 10 % mark, and another Engine page snap was taken after things settled. This process was repeated in 10% increments up to 50%. With each incremental leaning step up to 40%, the rpm increased 10 to 20 rpm (reaching 3100,) and the EGT steadily increased. Above 40% leaning, cylinder 3# EGT peaked at 1430-degrees and the rpm dropped back to 3060 at 50% leaning. The leaning was returned to zero percent and the leaning test terminated at this point. This part of the flight test will be repeated to allow a settling time of several minutes after each leaning change for better precision.

While fifteen miles away from the Columbus airport (BAK,) I called the tower and requested a radio check. They came back with a “loud and clear” response. The difference between this and earlier checks was that I could actually hear them. Due to previously low headset levels, I changed the wiring from the FlightLine radio to the headset, by shorting the tip of the phone jack to the first barrel terminal. Solved the problem.
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Temporary Leaning Markings

Temporary Leaning Markings

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Results From 40% Leaning

Results From 40% Leaning

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Results from 50% Leaning

Results from 50% Leaning

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