Section 13: Main Spar- 4 hrs 31 mins (Main Spar 13:38, Wings 16:38, Empennage 265:24, Total 301:58)
Rivet count: 0 (Total 5,409)Today was one of those days when you do SO much work and have little to nothing to show for it. The day consisted of taking the j-channel stiffeners from the last build session and using the cleco clamps to secure them 1/16" above the top edge of the main spar flanges. Then we match drilled the stiffeners to the hole spacing from the main spar. We remove the j-channels and set them aside for use in sections 16 and 20 a few months from now.
Since the spars are laying side-by-side, I was only able to work on the outside edges at first. It's not on the timelapse, but I swapped the spars with the help of L to work on sides 3 and 4. The last thing after removing the J-channels was to drill to size the rest of the holes on the main spar flanges with the #40 drill. This is in preparation for countersinking in order to accomodate 426-type rivets for nutplate attachment, as well as accomodating the dimpled skins to fit flush.
One interesting thing is that the plans do not call for deburring the main spar flanges. Part of me thinks that it is obvious to deburr and the plans shouldn't have to tell me to do so anymore, but part of me wonders if it is purposely omitted to not mess with the beautifully anodized surface of the spars. I will have to do more research.
Four and a half hours later, I have 8 sections of J-channel with a bunch of holes in them, and two main spars that pretty much look the same as when we started. Yep, it's one of those days... -M
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