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RV-7A Construction Log
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Date:  9-2-2017
Number of Hours:  0.50
Manual Reference:  
Brief Description:  Antennas 2 Transponder

Next I had to ponder "doublers". There is a lot of info on doublers. The book and some folks say the doubler needs to attach to both the skin and an internal rib so the skin doesn't watercan or flex. But most just add thickness to the skin with a doubler and don't worry about catching a rib because the antennas go very close to a rib anyway and the skin is not able to move much in these areas. Also most builders agree the doubler must be riveted to the skin and not rely on just the antenna screws. This is for strength but more importantly it is to ensure a good electrical connection between the skin and the doubler. Because the antenna is going to be grounded to the doubler and needs the skin also as its grounding plane. I used 0.032 thinkness. I suppose 062 would be better but the skin is only 0.024 and an A&P told me to use similar thickness as the skin. I also rounded the corners of the doubler so they won't dig into the skin if it vibrates.

So I drilled the holes and deburred.
I used my pop rivet dimpler to dimple the skin. This took awhile. Slow going.
Then removed all primer. Some say to add alodine for corrosion control. I did not because I have the 100% alumimum alclad which should resist corrosion. Plus I didn't want alodine to get in the way of the electrical connection. I hope later this doesn't turn out to be wrong and let oxidation in between the doubler and skin. I doubt it. Plus the rivets are secure.

The rivets show on the bottom. OH WELL.

I will put the antennas on later when I'm closer to done.
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Transponder

Transponder

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Bottom view.  Not going to paint

Bottom view. Not going to paint

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Transponder

Transponder

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