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Old 07-01-2018, 07:05 PM
ethand ethand is offline
Join Date: Mar 2013
Location: San Diego
Posts: 167
Default Rudder Cable Play/Slack

I installed the rudder today and the cables are very very slack. I have the control approach pedals so I assume there will be some level of modification required to the system.

The pedals are in the forward most location so I built the F-10104 rudder cable links at the 2.25" recommendation.

I assume the control approach is different but need to understand how much (if any) slack is allowable in the system to know when I have modified it enough.

My play is to shorten (or eliminate) the links as required so the cables are tight with no slack and can get the required rudder movement, unless I am missing something.

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Old 07-01-2018, 07:17 PM
Auburntsts's Avatar
Auburntsts Auburntsts is offline
Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,747

With both feet on the pedals can you move the rudder from stop to stop without excessive travel? With no air loads the opposite pedal to the one being pushed will always be slack unless you keep some foot pressure against it,
Todd “I drink and know things” Stovall
RV-10 N728TT - Flying!
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Old 07-01-2018, 07:30 PM
ethand ethand is offline
Join Date: Mar 2013
Location: San Diego
Posts: 167

With the rudder centered and the pedals centered both cables have significant slack. If I press one pedal it travels an inch or two before the rudder starts moving.

All things are rest there is probably two inchs of cable play before anything moves

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Old 07-01-2018, 07:38 PM
Kyle Boatright Kyle Boatright is online now
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 3,882

Sit in the seat. Press your feet against both pedals. That takes out the slack.

All RV's are that way.
Kyle Boatright
Atlanta, GA
2001 RV-6 N46KB
2019(?) RV-10
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Old 07-01-2018, 08:26 PM
Lars Lars is offline
Join Date: Nov 2005
Location: Davis, CA
Posts: 1,110

I worked on an RV-6 a few weeks ago that had coil springs connected to the rudder pedals to the lower longerons, ostensibly to take out the slack in the rudder cables. They added so much stiction to the system that at low speeds, the plane would fly along happily with the slip/skid ball a full ball out. Pick a side and it would stay there. Landings were miserable since the plane wanted to slip or skid, it was difficult to get it centered. The owner (not a builder) assumed that's how RV's are. I pulled the springs out with the owner watching anxiously, since he wasn't convinced that the cables should be allowed to have slack. Until he flew it. Big afterwards.

The rudder self-centers in flight. You can pull the pedals up with your toes while flying, the cables will be slack in the interior, air loads will continue to hold the rudder centered. That's how it is.
Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
880+ hours as of December 1, 2019. Where did the time go?
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Old 07-01-2018, 09:46 PM
MercFE MercFE is offline
Join Date: Sep 2014
Location: Maple Valley, WA
Posts: 271

It is not a push/pull cable setup, so there will be slack until you take up the extra by putting pressure on the pedals.
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Old 07-01-2018, 10:05 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 4,333

As mentioned, slack is no issue. However, to insure your links are not too long, your rudder should hit it's stop before the pedal hits the firewall and the two pedals, with the slack out and rudder centered should be in alignment and at a comfortable position for the pilot.

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
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Old 07-01-2018, 10:35 PM
ethand ethand is offline
Join Date: Mar 2013
Location: San Diego
Posts: 167

Thanks for all the replies.

Will take a look next time I get to the airport.

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