Project: TerryS     -     Entry

Nov 17, 2020 5 F-770 conical bends Category: Fuselage
Conical bends on both F-770 skins today. I wasn't looking forward to having to heave and pry to try to get those skins off and on again, so I shimmed everything as level as I could in the hope that it would line up again without a lot of hassle.

I also measured and marked to forward ends of the longerons for trimming. They are supposed to be 3/4" back from the fwd edge of the F-770 and they bother were a little fwd of that.

With that done, I removed the F-770-R and match drilled a piece of angle to cleco to the bend area per instructions. Deburred & burnished the heck out of the relief hole that the sharp 90* bend was on in an effort to prevent possible cracks.

Bend went fine, but took a couple of trial fits back on the airframe to get the aft curvature right. I cut the longeron to the correct length before installing the skin again.

Same process with the F-770-L, but darn it to heck, that one developed a micro-crack about 1/32" long. Stop drilled it with a #50 bit, then opened it up with a jewelers file. Ended up being a relief about 1/8" long, that nobody will ever notice. I'll fill it with B2 during final assy.

After I got the skins on and fitting pretty good, I realized I had forgotten to cleco in the F-623 rib attach straps. I had made these way back when I was working on the center section, and they have been sitting in the top of my tool box ever since. I didn't want to take the side skins off again, so I crawled underneath and dropped the baggage floors for access.

Seeing how this all goes together, I'm pretty sure I'm going to fill all the various seams and rivet lines in this area with B2 during final assy. I can see water potentially running down the F-770 skins and wicking right into that joint.

It was really gratifying to see this come together. I know its will all have to come apart again, but for right now it seems like a real milestone to see something recognizable as a fuselage in the garage!


NOTE: This information is strictly used for the EAA Builders Log project within the EAA organization.     -     Policy     -     © Copyright 2024 Brevard Web Pro, Inc.