Can't untwist tank ribs

[s10sakota]

I'm wondering if this is normal? I can not untwist the twist in the tank ribs. I have fluted them, and if I lay it down on the bench, one corner of the rib will pop up. I can press down with a finger on each corner and it will lay flat against the bench, but as soon as I lift a finger, a corner will pop up.

No matter what I do with the fluting, there is still a twist in the rib. Does this matter? With much moaning, groaning, and swearing, I am able to cleco them to the tank skin. I suppose the skin holds them without the twist, but I just want to make sure this is ok because right now I'm ready to take a sledge hammer to the **** thing.

[Wayne Gillispie]

That is fine as long as rivet holes are lining up and clecos go in fairly easy. Keep at it...it is really worth it!

[Flyin4Fun]

Sometimes the face of the rib has bulge in it. You might try laying a straight edge down the length of the rib to check. If that is the case, don't worry about a little twist when the rib is laying on the table.

As Wayne says, keep on working.

[s10sakota]

Ok thanks-I'll presss on...

[FL370]

Just fitted mine today and had the same issue. The fluting actually made it worse but was necessary cause the fit was so tight. I found working on the top side first and putting in clecos in the first few leading edge holes and then flipping it over and putting a cleco in the most aft hole worked pretty well. I had to then tap the sides of the rib lightly with a dead blow to help the rivet holes into alignment and it worked like a charm.
My only problem was apparently I was sent an extra interior rib and not sent outboard rib. Doh! This is the right tank, the left one is done so I haven't gotten anything mixed up. Now I've gotta wait a good solid week for the rib to arrive. So it's on to something else for now.

[truflite]

I had the twist as well. The holes lined up but, clecos were a tight fit. I used a dead blow hammer to tap (and I mean just a tap) the ribs into position. When final drilling, cleco every hole except the one being drilled. Replace the cleco and move on to the next hole same procedure.

[s10sakota]

Sweet! I hope to finish up this left tank today and have it fitted to the wing.