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Michael's RV-10 Build Log
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Date:  4-9-2006
Number of Hours:  3.00
Manual Reference:  31
Brief Description:  Modified ribs

As I had said previously, the panel ribs need to be modified in most cases in order to accept several modern EFIS's. For me I will probably only need the left side but I modified the right also just in case. To do this I used some 1x1 aluminum angle that I got from Home Depot. This stuff is most certainly not 6061 but it will work for what I'm doing. I looked at many different examples of this modification from hatchet jobs to bridge construction and came up with what I did below. Basically I came straight back about 5 inches from the bottom of the panel attach point. From there I angled down to a point about an inch from where the rib passes through the sub panel. I then made two cuts in the angle to allow for these two bends and bent it up to where it looked about right. I then traced this onto the rib and cut it out on the bandsaw. Once cut and cleaned up I layed out the rivets on the angle and drilled them. I then placed the angle on the rib and match drilled it. I also carried the new angle through the subpanel and riveted it to the existing ribs flange to tie the whole thing together nicely. One note is that I essentially set the rib inside the angle. This causes a problem where the subpanels tie together because of the added thicknes of the angle. I felt the angle was more important than one rivet on the subpanel so I nothched the subpanel flange and rebent it to make up for the thickness difference. This also offset the rivet hole so that there is about 1/16th of material between the old and new holes. No big deal.
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New piece of angle traced to the rib.

New piece of angle traced to the rib.

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Angle riveted to the rib.  At least as strong as before and possibly even more so now.

Angle riveted to the rib. At least as strong as before and possibly even more so now.

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Another view of the completed modification.

Another view of the completed modification.

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