Title: Mounted empennage and connected controls
Quite a bit of time spent today and not a lot to show for it. Since I'm ordering a new set of replacement rudder cables, I figured mounting the empennage and confirming the length of rudder cables would be prudent. They are correct. While I was at it, I couldn't resist connecting the elevator pushrod to the elevator. This required assembling a few of the pieces that hadn't been assembled before. While there's not a lot to show for it, it provided a good opportunity to confirm some things, and learn many things. The stabilizer was originally bolted to the rear fuselage with four 8 mm bolts. The original bolts didn't make it in the years of storage and transfer of the project. They are long gone. Fortunately 8 mm is almost exactly 5/16". So some AN5 bolts will be used instead. Resting the stabilizer right on the fuselage longerons allows the bolt holes to line up beautifully. Unfortunately having the stab on the longerons prevents the elevator from moving full travel, so some shims need to be mounted between the longeron and the underside of the stab. There are no drawings for this detail and looking closely at old pictures of the plane, I can't see anything that clearly illustrates this. The one thing that is obvious from some of the old pictures is a large gap between the top of the stabilizer and the lower edge of the fin. A simple fairing would have closed the gap up nicely. I guess that wasn't a concern by the time the plane was finally built. See attached vintage pictures. Regardless, this means I have a lot of room to raise the stabilizer. I shimmed the stabilizer with what started as two of layers of 1/2" thick foam. After experimenting, I think I'll only shim it up 1/2" total. I'll build some shims out of aluminum blocks and some aluminum plate as saddles. Another thing that took a lot of time was getting the proper travel on the elevator. I found in some old notes that the elevator travel was 30 degrees down from neutral and 20 degrees up from neutral. The fact that the down travel was 1.5 times greater than the up travel is odd. I played with the length of the pushrods and got the travel to be close to 25 degrees in either direction. Intuitively that just seems better. I got my younger son to sit in the cockpit and move the control stick back and forth while I measured travel.


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