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Ch 16 Control System
Rudder Cable, Winglet end

Rudder Cable, Winglet end

6 years ago
Dave Berenholtz
Ch 16 Control System
Date:  04-03-2019
Number of Hours:  12
Manual Reference:  16-7

Swage a cable and fit it to the rudder bellhorn. It turned out to be a little tricky and three days work. I went to a huge amount of trouble fitting these bellhorns during the winglet build. This was to ensure there was room for the internal actuating arm on the bottom of the rudder to swing freely when attached to the cable.

I knew it would be tight in there so I got the teardrop fittings of the correct size and made them a bit smaller with a little grinding. Here you can see the gap where the clevis pin goes. I had those circle AN111 on hand as well, just in case.

Here we are all fitted up and I installed the rudder. I installed and removed the rudder several times over the coming days. I’m getting better at it.

What I found now was that when the cable was attached the rudders if you pull the cable hard and full deflection they would would stick! This is because the teardrop shape of the fitting gets caught between those black plates if you hit the rudders hard enough which I believe are not far enough apart for this size fitting.

This is despite the plans internal winglet springs installed. So the sticking out ‘stuck part’ was greater than the spring force.

My solution was to go to the circular AN111 fitting.
I had to be VERY careful with the swagging. I left a little slack so the cable was not too tight on the AN111-4. Then I had to file the corners of the brass swage piece, Nicopress sleeve 18-1-C, so it would not jam on those back ears on the thick side. That’s the side that presents to the wing hole. I had to file them about .5mm on the fat side of the ends …yeah not much but otherwise it snags.
Then I went to a longer clevis pin than plans and used half AN washers to get the length perfect with a pin in place. This works a treat and my rudders no longer stick. I was also careful that the cotter pin didn’t add extra friction.
With this fix done, the rudders no longer stick and now function correctly when you pull on the attached cable at the wing root. Time to move on to the other end of the cable at the wing root.
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Rudder Cable Routing from the Fuselage to the Hot Side

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