HS and Elevator Finalized

Time: 2hrs

Things done today:

  • Installed rivnut and secured trim tab hinge pin
  • Loosely installed bolts in elevator to HS hinge
  • Went through Empennage mounting hardware and figured out where it all goes

I finally heard back from SA TAF about the trim tab hinge pin. They said go ahead with the planned install of the rivnut. So finally I could finish up the elevator. I installed the clevis to the trim servo and got it close to center. This will be adjusted later so I just put some heat shrink on the cotter pin so it doesn’t fall out and to remind me this needs to be finished. I also attached the elevator to the HS mainly to make sure everything looked good and lined up. I’ll probably leave it like this and find a place to store it as a whole assembly. 


Installed the M3 rivnut and secured the hinge pin using the part I made from the end of a hinge section and an M3 screw with some medium thread lock. It holds the pin really well and the trim tab moves nice and free. I did try to install the clip on the inside of the bend, but I noticed that the pin did have a tendency to try to slip out a bit. This is because the clip and the pin were both in the same rotational plan. With the clip on the other side of the bend the pin doesn’t try to slip out of it because the rotate against each other. 


Clevis is installed on the trim tab side. This will need to be fine tuned later so I didn’t bend the cotter pin. I just put a long, obvious piece of heatshrimk on it so it doesn’t fall out and get lost. 

Loosely put in the AN4-5 bolts and washers on the elevator/HS hinges. The washers were a pain to get in especially the second one on the inside. I ended up using some masking tape to slip the washer in and hold it then pulled it out once the bolt captured  the washer. After some practice it wasn’t too difficult to get a hinge done. I also made sure to point bolts inwards. 


I installed a short 3.2mm rivet and a wire tie clip to hold the wire and connector. The rivet is covered by the access panel so you don’t see it. 

A photo of the installed trim tab. 


A shot of the finished HS and elevator.