- Left Elevator
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Task: Finished the trim tab
I started by clamping the trim servo assembly
to the cover plate. I used 2 cleco clamps on either side and
drilled #40. I then removed the servo from the brackets and
final drilled #30. I later realized I had read the plans incorrectly.
The three rivets that attach the brackets to the cover plate
are AN426 rather than AN470. I used NAS Opps rivets in their
place. They worked fine.
I then trial fit the clevis pins and cut the rod to length.
I hooked up a 9V battery and checked for free motion. I noticed
the rod gets very close and even rubs the top edge of the
slot in the elevator. This was due to the shims I made to
raise the servo off the cover plate.I decided to over-squeeze
the aft two rivets so the servo could sit on the brackets
without the shims. This worked out well and eliminated the
Next I set the rivets in the elevator half of the hinge.
I marked a center-line on the elevator tab
and two lines at 1" and 3 1/4" from the inboard
edge. There are 3 lines marked in the picture below but I
changed it to 2.
Then I centerpunched the marks, drilled #40
and rreamed #30.
I then set the two MSP-41 rivets.
After A LOT of work,
the trim tab is finally complete. I'm not completely happy
with how it turned out, but it works, is safe, and the unsuspecting
person will never know the difference. This may be something
I decide to build again later on.