Bent the “ears” on the HS-714 to the 6-degree angle specified on DWG 3. To get the 1/8” bend radius I clamped the the end of the angle in the vise with an AN4 bolt at the specified bend location and simply pulled on he part to make the bend around the bolt (photo 1). I bent each side until the resulting angle after springback approximately matched the old HS-714. I then set 6 degrees (actually 174) on my machinist’s protractor and made slight adjustments in the bend until the HS-714 matched the protractor. That took about three iterations to get the bend as close as I could read the protractor.
Clecoing the HS-714 into the stabilizer showed the tips of the ears about 0.020 short of laying flush against the HS front spar web, so I did a bit of trigonometry to calculate how far behind the center of the part the tips of the “ears” should be. Sure enough, the measurements showed the the tips were about 0.020” short of making a 6-degree angle. After adjusting the ears to match the trigonometry the HS-714 sat perfectly flush to the spar from one end to the other (photos 2 & 3).
Before riveting the HS-714 in place I still need to final drill it to the spar, then countersink the rivet holes immediately outboard of the centerline so the dimpled holes in the spar web will nest properly.
Bending around an AN4 bolt gives the 1/8" bend radius.
