Brief Description: Drill cleco rear spar to stabilizer ribs
I drilled and clecoed the rear spar to the ribs. I tried to position the ribs so that they had about the same distance above the front (bottom) flange as the ribs were above the bottom flange on the front rib where the rib was centered between top and bottom flanges.
the L-Angles for the end ribs were cut, drilled, and clecoed (Image 2)
When I drilled the (#30) hole for the top rivet for the center-right rib, the rib moved and the hole in the rib did not line up with the holes already drilled in the spar and doubler. I drilled the hole out to $20, but the hole in the rib flange was shaped like an 8 on its side. To strengthen the joint, I decided to add a length of L-Angle as a doubler (Image 3). I may add a couple of A4 rivets throught the L-Angle doubler and the rib webto further strengthen the joint.
Lesson learned--always try to use two clamps when drilling. That will stop the part from rotating around a single clamp.
