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RV-7 Construction Log
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Date:  11-17-2013
Number of Hours:  4.80
Manual Reference:  p. 8-5
Brief Description:  Center Fuselage

After finishing up riveting the aft fuselage I got started on the center fuselage. I started by fabricating the F-916C spacers. The seat ribs have two flanges on the aft end, one offset from the other by 1/4 inch to account for the rear spar carry through being two 1/8 inch thicknesses toward the outboard ends. The inboard seat ribs fit over only one thickness of the rear spar carrythrough, and the F-916C spacers make up the difference.

I then modified two of the inboard seat ribs to accommodate the control column access plates. When enlarging the lightening hole, I missed the note that has you cut a 1-1/2 inch hole centered on the 1/8" hole (in the removed part in photo 1), but I hit it fairly close by free handing a line and using snips to remove the section. In a slight deviation from the plans, I'm using one-legged plate nuts in lieu of loose nuts and washers for the screws that attach the access plates. I still have to enlarge the lightening holes on two more inboard seat ribs, and I seem to remember some builders adding access plates to these ribs as well. I'll do a bit of research on the VAF forums before I commit.

The instructions don't mention it, but the seat rib flanges need to be squared to the web. To accomplish this I used the same tool I made for the wing ribs (photo 2). I then fluted all of the F-716 ribs to straighten the flanges and hopefully ease clecoing them to the center bottom skin. I will also flute the F-715 seat ribs to make them fit the side contour of the airplane, but I'll have to mark the hole positions through the skin first.
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Modifying two of the inboard seat ribs.

Modifying two of the inboard seat ribs.

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Squaring the flanges of the seat ribs.

Squaring the flanges of the seat ribs.

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