Author Topic: Elevator Trim Cable  (Read 449 times)

myles-dean

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Elevator Trim Cable
« on: Dec 28, 2017 »
Good day,

I am planning on adding a trim system to my S2 and have gone though the newsletters, etc. A couple of quick questions for anyone who is using cable: Are you using a continuous cable or using a cable sleeve to join the ends? If using a sleeve to join, how do you prevent it from working its way to the pulley?

Thanks!

Kevin R.

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Re: Elevator Trim Cable
« Reply #1 on: Dec 28, 2017 »
Clamp the sleeve at each end with an adel clamp.  I prefer the all metal adel clamp in this case without the rubber on them.

Kevin

Soneraifred

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Re: Elevator Trim Cable
« Reply #2 on: Dec 28, 2017 »
I assume that you are installing a jackscrew on the leading edge of the horizontal stabilizer.  On mine, I use a pair of nicopress sleeves to connect the ends of the cable together.  They are positioned in the middle of the trim travel.  If you move the trim far enough, the sleeve will run into the pulley, but you should be at the extreme end of the travel.  I’ve had it happen a couple times when the cable slipped in the pulley due to grease in the jacksrew threads that got too stiff in cold weather.  The fix is simple. Disconnect the jackscrew from its fork, move the sleeve(s) back to the middle of the travel, adjust the jackscrew to the middle of its travel, and reconnect.
Fred Keip
Owner-SoneraiWorks LLC
Sonerai Newsletter Editor-Retired
Sonerai IIL, N99FK

Mytonic

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Re: Elevator Trim Cable
« Reply #3 on: Dec 29, 2017 »
Do you use anything to maintain tension on the cable or do you just bolt it up in a taunt position

Soneraifred

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Re: Elevator Trim Cable
« Reply #4 on: Dec 30, 2017 »
At the present time, there is nothing tensioning the cable except the installation.  I do have a small turnbuckle that I can install if the cable loosens.
Fred Keip
Owner-SoneraiWorks LLC
Sonerai Newsletter Editor-Retired
Sonerai IIL, N99FK

myles-dean

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Re: Elevator Trim Cable
« Reply #5 on: Dec 30, 2017 »
Thank you all for the replies. I will be installing a jackscrew and was very curious about the cable. I was hoping to get away from a nicopress sleeve and was looking at a continuous cable (like a Piper Pacer uses), however continuous cable is very expensive.

Thanks for your help,
Myles

Tom H

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Re: Elevator Trim Cable
« Reply #6 on: Dec 31, 2017 »
Myles, you asked about a tensioner for the cable.  I am building a S2LS and when working on the stab adjust, I had the same concern about keeping the cable properly tightened.  The obvious answer was to install a turn-buckle, but did not have one, so thought of another idea.  I mounted the forward pulley (at the pilot position) to a slot, and put a draw-bolt to adjust the tension.  The bolt head behind the slot is tacked to a square slider guide to keep the bolt head from turning when tightening.  I have attached a picture.  The nuts will all be elastic stop nuts or cotter pinned.  I'll position the nicopress connecting the two cable ends at the mid-point between the forward and rear cable guides. 
Hope this gives you some ideas.

Kevin R.

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Re: Elevator Trim Cable
« Reply #7 on: Dec 31, 2017 »
Tom, that is really nice work!

Kevin

myles-dean

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Re: Elevator Trim Cable
« Reply #8 on: Dec 31, 2017 »
That is some great work Tom! Thank you for the pictures, they help a lot (like the old saying, a picture is worth a thousand words!).

I appreciate the feedback.

 

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