According to the KF manual, the #1 rib is supposed to be placed 35 1/2" inboard of the #3 rib (center to center, no wing sweep). When I do this, the butt rib, if it would fit, would cover 1/2 of the rear spar pin, and forward spar pin.



I am inclined to move the #1 rib outboard just enough the the butt rib will clear the pins with just enough room to get a socket on the rear pin. The problem with that is that the fuel tanks might be 1/4" wider than the gap that it is supposed to fit into if I do this. My right tank is 34.5" wide at it widest, and the left is 34.125 at its widest. The edge trim job on the fuel tanks isn't strait, and I would like to trim off a little of the edge of the tanks (maybe 1/8th inch each side) to allow the #1 rib to be moved outboard enough to accommodate the Butt Rib.


I measured #3 rib location on both wings and it appears to be correct, so I dont understand why #1 rib cant be placed where it is supposed to be and not have the Butt Rib over the spar pins.