It was a very good day at the airplane factory. Completed the left and right longeron. Whew!!! Happy that fabrication process is complete.
Today I made some final tweaks to the right longeron using the template. After I was finally satisfied with the match, I had to bend the aft end of both 4 degrees inboard in accordance with the plans. Had to use the 5# dead blow hammer to get the angle to budge. You have to whack it pretty hard. Using a little bit of high school trig, 4 degrees equates to a tad less than 7/16" over 6 inches. (Remember, Tan 4 degrees = opposite side/adjacent side of 6"). Using a straightedge and a small ruler was all that was needed. See the picture. After bending the initial 4 degrees inboard checked the vertical and discovered the angle needed to be beat back into the vertical plane. Used the dead blow hammer again. After a couple of iterations, finally ended up with a 4 degree bend and a flat top longeron surface. I did not trim the aft end of the longeron for weight savings. (Maybe later??)
Match drilling of the longeron to the template went very well. If you match the template during the bend process, this step will be easy!
Onto page 23-03, deburred all of the parts and MCS then riveted the roll bar attach plates, the mid fuselage brace and the mid fuselage brace closeout to the fuselage. I placed F-1205C over F-1205A on the forward edge of F-1205C. The plans do not specify if F-1205C should go over or under F-1205A on this forward edge.
Found a 2nd error on Page 23-03. The plans tell you the MCS the F1205B Roll Bar Attach plate, #30-120 degrees in 4 locations on its forward edge. These 4 locations get a CS4-4 rivet (Figure 2, inset). Appears that the 5th hole on the forward edge needs to be MCS also. See Page 23-06, Figure 1. The forward, outboard hole gets a CS4-4 rivet here.
A good day!!
Time - 6 hours
