Then I taxied the RV-4 to the compass rose on the airport and calibrated the remote magnetometer for the Dynon EFIS. It turned out to be a very easy procedure. I lined the RV-4 up pointing magnetic north on the compass rose and started the calibration program and pressed the north button on the Dynon. Turned the aircraft to face magnetic east and pressed the east button on the Dynon. Turned the aircraft to face magnetic south and pressed the south button. Turned the aircraft to face magnetic west and pressed the west button. The program took about a second to finish the alignment program.
After calibrating the remote magnetometer, I calibrated the fuel tank level sensors for the Dynon EMS. I drained all of the fuel out of both tanks. Then I arranged to have the fuel truck from the local FBO help me calibrate the tanks. Again it was very simple with the Dynons, put it into fuel calibration mode and press the start button. The screen prompts you to add 2 gallons at a time and press the add button.
The sensors didnt change after 14 gallons so I pressed "FULL" to finish up with that tank then repeated the steps for the right tank.
The tanks actually hold 16 gallons in each but the sensors hit the top of the tank before the last gallons can be added because of the tilt in the wing. The picture below shows the fuel levels on each tank with full tanks.
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