In my previous post I showed an elevator rib flange that I'd riveted (what I thought at the time was) the correct orientation. There's obviously more definitive instructions out there somewhere regarding the correct way to rivet two different thickness sheets.
This first diagram on page 05-04 (Section 5) shows the manufactured rivet head adjacent to the thinner sheet...
and the next on page 05-05 I interpreted as the other way around...
Initially, I didn't see the 05-04 image as there were many more images on page 05-05 describing most of the Commonly Encountered Problems Riveting. I read the images on page 05-05 as showing the thinner sheet on the shop head side of the rivet - WRONG!!
I then grabbed a few scrap pieces of aluminium and tested both with the same rivet being installed on the elevator rib flanges. This image shows the thick side with both manufactured and shop heads...
...and this shows very clearly that the manufactured rivet head needs to be on the thinner sheet side...
These next three photos show even more clearly, the flex of the thinner sheet away from the thicker sheet when the shop head is on the thinner sheet side...
So, here I go drilling out another rivet. I must say I'm getting pretty good at this now. Not something to be proud of, but at the same time, a fact of life when building a plane.
Below I've cracked the head off and the shop head/rivet body stayed in the flange. A small twist with the pliers fixed that. You can see the flex in the rib flange cause by squeezing the rivet...
Once to rivet was out, I had to flatten the rib flange to make sure it was flush again.
Ahhh, that's better...
Left and right elevator rear spars with ribs riveted...
No comments:
Post a Comment