Title: Rudder & V/S conformity wrap-up
Cleaned all the old tape residue off the rudder & V/S and gave them one more look for conformity to print. Some of the -4 rivet tails on the V/S aft spar look a little tall so I put a gauge on them and discovered that the tails are all pretty much the correct diameter, but still little taller than I would expect. I think that the original guys could have gone with a 1/2 size shorter here, but none of them appear to be overly clenched, so I'm leaving well enough alone. Found one more skin rivet on one of the end ribs that didn't have the tail set properly and corrected that. The -3's don't seem to work or age harden very much and even though all the previous work on this kit was years ago, I was able to hit it again with a hand squeeze without the tail cracking. The hinge points on the rudder & elevator are just heim joints. On the rudder, they had been screwed in, but not adjusted or torqued, and I spent WAY longer than expected obsessing over this. I found a few nicks on the bearing housings where I'm assuming the previous guys had screwed them in with pliers or an open end wrench, but nothing significant on the face of the bearings, so no damage done. I already had a tool for screwing these in which I made by squashing the end of a 1" pvc pipe into an oval to slip over the bearing end, and that's what I used for adjusting them in/out. The print calls out a dimension from the center of the bearing to the face of the spar web. The bottom one is 1 1/16" but the other two are 59/64" & 51/64". Eyeballing a measurement to the center of a bearing down to 1/64" was challenging, but I want buttery smooth flight control movement so I spent a couple of hours measuring, running plumb line through the bearings, measuring again, etc. I finally got them to a point where I'm happy, and torqued down the jamb nuts. Vans doesn't call out a torque for the jamb nuts so I went with the 43.13 callout for shear nuts. The heim joints are 2 different sizes, so I went with 110 in/lbs on the -6 (bottom) and 80 in/lbs on the -5 (center & top). At this point, the rudder & V/S are done, although I haven't hung the rudder on the V/S yet, so I'm hoping the hinge brackets on the V/S are true and it will swing freely.


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