Brief Description: F-631 C/D Final Drilled for AN4 bolts #1
Double checked the proper position before final drilling of the .247 reamer for the AN4 bolts that secure these angles to the fuselage. Stepped up drilling #30, #19, 3/16, .247 reamer. The AN4s were .2465. Tight fit but they went in and out, then back in again temporarily. You can see how I secured the roll bar for positioning proper tilt. The large aluminum yardstick was my clamping device to minutely change the angle of the roll bar until I achieved true 2 7/8 tilt. (2 15/16 to account for the displacement forward 1/16 because of using the angles to create the baseline. Mentioned that in an earlier post. That long piece of angle at the top is clamped back on the fuselage to firm up the vertical piece of angle. I can now continue to drill and drill/tap more mounting holes in the angles and the roll bar bottom according to the plans, followed by marking and filing down the outside of the 3/16 mounting angles to conform to the shape of the fuselage skins that will attach there. You can notice the aft end of each outer angle overhangs the skin line and needs to be contoured to the shape of the fuselage. Standard stuff. Its easier to drill the holes first, squared to the roll bar after which you can file/sand the contour shape. I think.
Long angle secures the upright piece of angle. Yardstick clamps the roll bar at desired tilt.
