Progress on the wing. Fabrication of the N-strut.
After squaring up the wing, I laid tubes in place and then clamped with my high-tech angle-preserving clamp (2 scraps of ply and a screw)
Tacked things together and checked fit.
Before I got too carried away, though, I realized I needed to remove a bit more of the uprights on the ribs next to the strut attach fittings so they would fit over the fittings. I should have done it before putting on the wing, now I can't easily get the rib off.
But that just meant an opportunity to make another tool--I ground a 3/32 piece of welding rod into the shape of a spade bit.
Nice and flexible, it bent parallel to the spar, allowing for end holes for the gap I'd cut out with an oscillating multi-tool. It cut pretty well.
After that, I cleaned and primed all the various parts and put them in.
Added drag wires and did initial tramming.
There is a mystery, though. After I snugged up the compression struts and N-strut, the spars are straight according to string lines along their lengths, but in the middle there is a 1/16" twist on the rear spar near the N-strut. That is, the space between spars on the top is 1/16 less than the space on the bottom. The ends are right on. Using a level, I can see the rear spar is slightly twisted in, and I'm trying to account for that. The N-Strut measured square, but now it doesn't....
So I'm contemplating shims, or removing things and starting over.
