Finally got the top skins riveted on the left wing. After finishing up the wiring and testing the pitot tube electrical I figured it was safe to close up the wing.
I had a few holes on the rear spar that slightly didn’t line up (same spot as the right wing) so the holes needed to be elongated a bit. I had one area near the rear spar and skin join that I noticed some oil canning before I riveted it so I tried a few things to get ride of it like checking all the holes to make sure the rivets weren’t in too tight and pushing on the skin and reclecoing the section to see if that could alleviate the issue. Nothing seemed to work so I carefully started to rivet and see if it got worse or better. I riveted in such a way to try to smooth out any lump in the skin (that I couldn’t really see) and also tried to pull the skin a bit to make it tighter. The oil canning still persisted. As I riveted and was nearing completion of the area I though to myself that I’ll just need to drill out most of these rivets and try again. Then to my amazement I put in the very last rivet which was probably 10 or so rivets towards the root along the rear spar away from the section that was having the issue and checked the oil canning… it was gone. One rivet that was seemingly not even related fixed it, so freaking weird. I think that’s what makes fixing the oil canning so difficult. The rivet or rivets that are causing the problem could be not even in the area where the problem is. Frustrated and confused, but glad it’s fixed
Another thing I noticed and it’s kind of funny that I just caught this now (as I near the end of the riveting stage of the build) is that the rivets are not all exactly the same. There are some variations in the size of the rivets. I first noticed it using the 4.8mm rivets on the ribs. It seemed like a rivet should fit fine in a hole, but it didn’t and then I used another rivet and it fit fine. The same is true for the 4mm rivets, maybe not so much for the 3.2mm ones though. So what I got out of this was that if you’re putting rivets in the holes and the rivet is fitting a bit tight, rather then ream out the hole or trying to get the rivet in with more force, just try another rivet. In most cases if you go through a few rivets one will drop right in.
left wing ready to rivet
Both wings have all the skins riveted. Now I need to do the fuel tanks and the wing tips.
Left wing all done. Just have to fill all these rivets.