December 15, 2019

VOR Antenna Provisions

In addition to the doubler plate, I also need to modify the skin to accommodate the antenna elements.  I notched the skin so that I can slide it up around grommets at the base of each arm.  Pictures are better than words in this case…

Antenna attached to rib 4. The arms on this antenna aren’t removable so I had to slide one element through the hole
Notches I cut into the skin. On one side, the notch is exactly centered using one of the existing rivet holes; on the other side, I had to make a new hole with a 1/8” pilot drill. I used a step drill to open up both holes to 9/32”, and then used shears to create the notch. The notch is slightly narrower than the 9/32” hole so that the grommet “snaps” into place and doesn’t slide around
Testing of grommet fit in the notch
Sliding the notch over the antenna and grommet
Perfect fit!
View from the top side
Both sides fit nicely. Notice that this antenna has elements that are offset from each other, hence why the notches on the skin had to be in different places

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