Stjohn's RV-7

6 hours.
After some adventures in tubing, it was time for some good old-fashioned mechanical hijinks, this time involving the bellcranks. Since I’ve got the quickbuild kit, the build sequence is, uh, fragmented. Supposedly, during the wing build, the plans and manual stop holding your hand and you need to just figure stuff out, which is fine, but it really makes you double-triple-quadruple-check everything before you cut metal or stick it together. In this case, the tubes and the aileron brackets were two discrete operations that were done separately. The aileron brackets (wing side) I did a couple of months ago while waiting for some rudder parts to arrive, and the tubes I did last week. This week, it was all about the bellcranks, which were good old fashioned meat-and-potatoes mechanical fun. I did have some issues cutting the aluminum spacer tube, which you are given just enough of to do right the first time. In my case I had to grind off extra material on the ends to get a flat end, thanks to my cheesy bandsaw, which is probably just more out of alignment than anything else. I had enough tube to get the left aileron on, and get it hooked up to the bellcrank via the short steel push tube, and I think it works OK, no binding, free motion. The good folks at Bill’s Air Center were nice enough to give me a cat-food can of aviation grease for the brass bushings in the bellcranks. I didn’t finish all the stuff on the right aileron though. I don’t have enough aluminum .058 wall 3/8″ tubing to make the spacers for it, so it’s on there in a temporary fashion until my spruce order shows up. But both bellcranks are in, lubed, and torqued, so we’re ready to rock.
Here’s the left aileron, in place, bellcrank installed. The blue piece near the bellcrank is the jig to hold it in the neutral position while aligning the aileron:

Close up of the aileron bracketry. Got good rivets on the pushrods, thanks VAF! The alignment of the ailerons is probably bogus, but here’s how I did it: The distance from the white aileron bracket on the aileron to the top of the reinforcing angle on the wing is measured with a micrometer in two places, down near the hinge and up near the end of the angle. When the measurement is the same, or within a few thousanths of an inch, that’s where the neutral position is, and the threaded bearing at the other end is adjusted accordingly before getting bolted to the bellcrank. I’m sure this will change, but it’s OK for now:

This is a shot of the right side bellcrank assembly. No jig on this one, I think I only got one and it’s on the other wing, unless it’s floating around in the bottom of the canoe which is where I’m storing a lot of parts until I get some shelves put up in the shop. I hope to finish this process this weekend while I’m working off turkey and stuffing.