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Adventures with the Tail Part 3

July 17, 2018 Art Zemon

Six years ago, I installed the two weldments for the horizontal stabilator on the tail of my Bede BD-4C airplane. Take a look at Getting Closer to the Tail for photos.

Four years ago, with help from Steve at BedeCorp, I fixed a problem with one of the weldments that holds the horizontal stabilator. You can read the whole story here: Straightened the Crooked Tail

Last night, I fixed a problem that I had created in the other weldment. The weldment that attaches to to the fuselage holds the bearings for the stabilator pivot. To install those bearings, I had to ream out the weldment slightly. Back in 2012, I goofed and reamed a little too deep into the weldment. Here is a photo of what it looks like now:

Weldment for the horizontal stabilator on a Bede BD-4C
Weldment for the horizontal stabilator on a Bede BD-4C, showing where the bearing gets installed

If you click on that, so you can see a larger version of the photo, you will see a thin shoulder about 3/8 inch inside the weldment. That shoulder is too far in. The mistake allowed the horizontal part of the tail of the airplane to slide left and right. Bad me. 🙁

I consulted with BedeCorp and decided to make a spacer out of a washer. I started with a standard washer and did a bunch of sanding. I had to reduce the outside so that it would fit into the 7/16 inch hole in the weldment. I also had to enlarge the center hole so that a 1/2 inch spacer tube would fit through it. Here is a photo of the spacer-in-progress and one of the bearings.

KP6A bearing and spacer
KP6A bearing and spacer

When I installed the spacer and bearing, the bearing stuck out of the weldment a few hundredths of an inch too far. I did a little more sanding on the spacer, to reduce its thickness where it contacts the shoulder of the weldment. Here is the final version.

Finished spacer on KP6A bearing
Finished spacer on KP6A bearing

I put the weldments back together and, after a six year odyssey, I am finally happy with the fit. There is no slop at all. I will put the horizontal stabilator on the plane tonight and am very optimistic.

Bede BD-4C

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Omni-curious geek. Husband. Father. Airplane builder & pilot. Bicyclist. Photographer. Computer engineer.

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