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RV-7 Construction Log
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Date:  6-3-2012
Number of Hours:  8.40
Manual Reference:  p 7-5
Brief Description:  Left Fuel Tank

Today I riveted the platenuts to the 6 brackets that have them, and 3 platenuts to the spar for the inboard bracket. I bolted all the brackets to the spar and test fit the baffle. All the bracket centerlines show through the holes. Woo hoo!

I then edge deburred, squared, and straightened all the ribs for both tanks. I'm getting used to the process, but I wouldn't want to do it for a living...

According to the photo timestamps, I spent about 1 hour 10 minutes of work to install the ribs into the left tank skin. The thicker tank skin is quite a bit harder to conform to the rib profile than is the leading edge. I started with the skin out of the cradle, and clecoed the top side, with the most forward cleco going in first from the inside, as in the leading edge. Easy peasy. Not so for the bottom side... After much wailing and gnashing of teeth, even with the tank skin in the cradle I could NOT get the most forward holes to line up. I finally figured out that I could get the aft most cleco in. As I worked my way forward, the rib gradually nested into the leading edge. That forward-most cleco that had been so stubborn earlier practically fell into place.

After installing the tank on the wing, I was pleased with its fit to the leading edge. The very nose of the tank is about 0.018" proud of the leading edge at its worst point, about of third of which is the difference in skin thicknesses. The aft edge of the tank is hard up against the main skin, so I'm thinking a little agressive deburring will bring things into place nicely.

While I was at it, I went ahead and match drilled all the baffle holes in the z-brackets. After drilling the inboard bracket, I removed the leading edge and drilled the outboard bracket. Removing the tank skin and interior ribs then gave access to the last five brackets.

From wing skeleton on the bench with rear spar clecoed on to this in 3 days. All weekends should be this productive!

Rivets Today: 42
Rivets Total: 2793
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About 1:10 to install the ribs in the skin.

About 1:10 to install the ribs in the skin.

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Looks like a wing!

Looks like a wing!

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Z-brackets drilled.

Z-brackets drilled.

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