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RV-7 Construction Log
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Date:  6-1-2013
Number of Hours:  4.90
Manual Reference:  p 8-3
Brief Description:  F-705 and F-706 Bulkheads

After finishing in the shop yesterday, I noticed that the seat back adjust plate and shim get attached to the bulkhead channel with AN-426 rivets, so today I countersunk the 0.063 shims to accept the dimples I'll put in the 0.040 plates. As has been my practice all through the build, I'll dimple the plates after priming and allowing the primer to cure for a few days. I then deburred the edges of all F-706 parts. I still have to decide how much priming I'm going to do on these parts.

I had some time left in the day, so I got started on the F-706 bulkhead by locating and drilling the electrical and static line passthroughs to full size (photo 1). I then fabricated the three angles that stiffen the elevator bellcrank support structure.

The plans show one hole drilled in the F-729B stiffener for the bellcrank rib (the horizontal angle in photo 2), and I thought it was the starter hole for drilling the stiffener to the bellcrank rib. To test that theory before drilllng the rest of the holes I clamped the structure together (photo 2). As is evident, this arrangement would leave practically no edge distance for attaching the stiffener to the F-729C short span wise angle that ties into the reinforcement plate.

I now think the one hole called out on the plans is supposed to attach the stiffener to that span wise angle. I went back out to the shop and tested my new assumption, and found that this arrangement works on the forward end, but leaves only about a 1D edge distance at the aft end of the bellcrank rib stiffener. I need to give this some more thought...
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Electrical and static line passthroughs in the F-706 bulkhead.

Electrical and static line passthroughs in the F-706 bulkhead.

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This definitely won't work.

This definitely won't work.

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