Working on control cables

November 15, 2018 – Well, I complicated my own life by going with a throttle quadrant for engine control. I’ll be so glad when this part gets wrapped up.

I drilled holes in the firewall at the suggested locations for the throttle, prop and mixture cables using my punch set. The holes are 1″ right now, just large enough to pass the cable nuts through. I believe the final hole sizes will be 1 1/8″ for the cable pass-throughs I’ll get from Spruce.

I bought a 48″ and two 52.5″ cables. When I got them I routed them through the firewall to test fit. I used closed-cell foam to protect the cable jackets from the stainless edges.

I already know the 48″ cable is too short for the throttle. As near as I can tell, I need 51″. I’m waiting to order until I’m sure about the rest of them.

I had to slightly re-clock the prop governor because the cable went over-center at full travel. I also bent the bracket for the governor for a straighter cable approach.

Along with figuring out what cable lengths I need, I also need to make sure those cables are secure so I can get an accurate idea for routing and their lengths. The cables will be secured behind (forward of) the quadrant, so I started prototyping a bracket for that. Here’s my first one:

…and my third:

I think this one may be in the ballpark. I also ordered Aircraft Spruce part #05-01437 which is an AN486 with a 10-32 thread. These should have a deeper throat for attachment at the quadrant. I wasn’t getting full travel at the quadrant because the shorter clevises were hitting the arms. They are on the way.

Time: 6:30

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