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RV-7 Construction Log
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Date:  9-10-2013
Number of Hours:  1.00
Manual Reference:  p 8-5
Brief Description:  Aft Fuselage

After giving it a couple of days of thought I decided to drill the J-channels to the aft ends of the side skins without the F-779 bottom tail skin in place, so I could use clecos through the whole assembly to align the parts and avoid figure-eight holes in the F-779 bottom tail skin. I backed up that decision with some research on VAF and found several builders who had done the same thing with positive results.

Photo 1 shows the best alignment between the F-779 and F-773 I could get without being able to use clecos to wedge the 779 into position. Photo 2 shows the F-779 removed and the J-channel centerline centered in the F-773 side skin holes. Photo 3 shows that I only marked the holes in the J-channels with the drill at the bulkhead to prevent figure-eighting the most likely misaligned bulkhead flange holes. I'll finish these holes off the airplane.

Note: I used a 3/32 drill instead of the slightly larger #40 to help ensure alignment when drilling the assembly.
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Misalignment between the F-779 and F-773.

Misalignment between the F-779 and F-773.

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F-779 removed allowing access for drilling the J-channel underneath.

F-779 removed allowing access for drilling the J-channel underneath.

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Only marked the holes at the bulkheads.

Only marked the holes at the bulkheads.

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