Brief Description: Main spar tank attach nutplates
Started on the 124 K1100-08 nutplates for attaching the tanks to the main spar web. Decided to reuse the angle from the rudder and elevator AEX trailing edge fabrication to provide a solid pilot for the csk bit. (Image 1.) The nutplate holes are not evenly spaced. By noting the inboard/outboared orientation of the angle, I could flip it over to do the opposite flange, as well as re-use it on the other wing main spar.
The #40 csk for the flush rivets really didn't require it, but a csk big enough to accept a dimple in 0.032 Alclad for a #8 screw goes through the 0.063 spar flange. (Image 2.) The resulting csks look huge (Image 3), but I made a couple test dimples in 0.032 scrap and the fit is good.
