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Kupe's Zodiac 650B
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Date:  2-16-2013
Number of Hours:  5.00
Manual Reference:  6-T-6
Brief Description:  Trim Servo and Elevator Cleanup

Had a hectic week at work this week, so no early morning sessions with the plane. Today was a good day. I finished up the trim section of the elevator, which included drilling out the rest of the trim tab hinge and installing the trim servo.

The trim servo is an interesting little device that lives inside the elevator, moves a rod fore and aft about 2 centimeters, which translates to up-and-down deflection of the trim tab the rod is connected to. The trim servo is a generic aviation one made by Ray Allen (I'll be seeing more of him in the future). Consequently, it takes some work to mount the servo appropriately inside the elevator, cut the control rod to the appropriate length, connect the servo, rod, and trim tab horn together, then cross your fingers and see if it works right!

After installing all the pieces and parts together, I wired up the servo, the trim switch, and the trim position indicator to a 14 volt power supply so I test them out (see image one). Everything worked great. I'll just need to adjust the rod length a bit by rotating the clevis on either end of the control rod which makes minute adjustments to the rod's length.

I also fabricated and fitted an optional "L" angle for the elevator which helps strengthen the mount for the trim servo,

Finally, I ensured all the holes were drilled out to the final sizes - especially all the structure inside the elevator - and began the deburring and cleaning process for final assembly.
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Excerpt from a video I took of the trim motor, switch, and indicator in operation.

Excerpt from a video I took of the trim motor, switch, and indicator in operation.

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The fabricated

The fabricated "L" bracket next to it's rivet line. It will be inside the elevator.

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The elevator disassembled and deburred.  Clean up and corrision paint is next.

The elevator disassembled and deburred. Clean up and corrision paint is next.

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