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  #1  
Old 02-11-2021, 11:37 PM
BryanG BryanG is offline
 
Join Date: Oct 2019
Location: Edwardsville, IL
Posts: 21
Default How to run conduit for rudder trim?

New builder question.

Working on adding electric rudder trim. I've never routed any wires or conduit and wondering what the best/most correct way to do it might be.

I'm in the planning stages so any advice is appreciated. I was leaning towards running conduit so I don't have to worry about selecting wires, connectors, etc. now since i haven't done that research yet. I have attached a picture with some of the parts to get an idea of what I'm looking at.

So to summarize:
1. Conduit or just run wires?
2. What routing should I take in the rudder?
3. How do I connect said conduit/wires securely to the rudder?

I have ideas and I've done plenty of googling but I haven't been able to find specific enough information that makes me comfortable i'm on the right track.

Thanks for any help.
-Bryan
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  #2  
Old 02-12-2021, 01:16 AM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,151
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2. Remember you want/need to keep the moment aft of the hinge as small as possible. If nothing else run the conduit as far forward as possible.
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  #3  
Old 02-12-2021, 08:40 AM
BryanG BryanG is offline
 
Join Date: Oct 2019
Location: Edwardsville, IL
Posts: 21
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Quote:
Originally Posted by BobTurner View Post
2. Remember you want/need to keep the moment aft of the hinge as small as possible. If nothing else run the conduit as far forward as possible.
I was considering the following routing as well, I'm mostly unsure about the best way to secure the conduit along its path.

Thanks for the input.

-Bryan
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  #4  
Old 02-12-2021, 01:18 PM
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HAL Pilot HAL Pilot is offline
 
Join Date: Nov 2015
Location: Las Vegas NV
Posts: 169
Default

Click bond or weld mount wire tie attachment running down the side of the forward edge of the spar.

http://www.weldmountsystem.com/produ...s-wireties.php

I think weld mount is a bit cheaper than click bond.


As far as the momentum CG comment it would make more sense to move the servo as far forward towards the spar as you can. This might mean having to build a longer pushrod.
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  #5  
Old 02-12-2021, 03:23 PM
TimO TimO is offline
 
Join Date: Feb 2005
Location: Wisconsin
Posts: 633
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That's what I'd suggest too. I didn't use any conduit, and keep the wires forward.

Also, I doubt you'll find a workable way to use conduit between the aft tail and the rudder.
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  #6  
Old 02-12-2021, 05:05 PM
leok leok is offline
 
Join Date: Apr 2013
Location: Clarkston, MI
Posts: 403
Default

+1 What everyone else said, plus;

Make sure the wire does not flex over a short distance or they will fatigue and break over time with rudder activation. I fixed my wires high in the rudder and low on the fin to allow a long piece of wire to take the flex. Another way is to take a length of wire and make a coil by wrapping it around a pencil or something, like an old phone cord. (Showing my age) That way the flexing of the wire is over a large length of wire avoiding fatigue with rudder movement.
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  #7  
Old 02-13-2021, 01:37 AM
ewumnrr ewumnrr is offline
 
Join Date: Jul 2020
Location: SAN DIEGO
Posts: 21
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Quote:
Originally Posted by HAL Pilot View Post
Click bond or weld mount wire tie attachment running down the side of the forward edge of the spar.

http://www.weldmountsystem.com/produ...s-wireties.php

I think weld mount is a bit cheaper than click bond.


As far as the momentum CG comment it would make more sense to move the servo as far forward towards the spar as you can. This might mean having to build a longer pushrod.
Vans order number "HW-00004" is a $0.35 cable tie holder that has one hole for a screw/rivet. That is the one they use in their plans to route the tail light cable.
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  #8  
Old 02-14-2021, 09:26 PM
Fenderbean Fenderbean is offline
 
Join Date: Jun 2018
Location: Huntsville AL
Posts: 78
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Is this all thats needed to have an effective rudder trim? While its not as fancy seems like a really easy way to add the trim.
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  #9  
Old 02-14-2021, 10:10 PM
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HAL Pilot HAL Pilot is offline
 
Join Date: Nov 2015
Location: Las Vegas NV
Posts: 169
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An internal option not requiring rudder modifications

https://www.aerosportproducts.com/product/rudder-trim/
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Pete

RV14A Tail kit build mostly done
Wing kit in progress
RV 14 WIKI in process, residing on Drop Box

https://www.dropbox.com/sh/xu5p6f4l7...bU0ck0pJa?dl=0

change dot org link http://chng.it/KBPtXZYD

---For Edit Access drop me a PM with your Email address.
EAA 1300
Donation Paid 2018,19,20,21 Military exempt but paid any way Cause its worth it.
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  #10  
Old 02-14-2021, 10:40 PM
Fenderbean Fenderbean is offline
 
Join Date: Jun 2018
Location: Huntsville AL
Posts: 78
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Quote:
Originally Posted by HAL Pilot View Post
An internal option not requiring rudder modifications

https://www.aerosportproducts.com/product/rudder-trim/
Kinda like that, one less requiring power to run. I have seen that before but forgot about it.
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