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  #1  
Old 03-05-2020, 02:31 PM
tdavis1198 tdavis1198 is offline
 
Join Date: Jul 2019
Location: Toronto, Ontario
Posts: 22
Default Rudder trim suddenly changes on Autopilot

I have the dynon autopilot in my RV-10 and have noticed a problem where the rudder trim changes suddenly when on autopilot. I realize that there are no servo controls to the rudder but it feels like suddenly someone stands on the rudder (i have seen it go both ways, left or right) during cruise.

I have a dynon autopilot.

Any ideas as to what can cause this?
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  #2  
Old 03-05-2020, 02:35 PM
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bkervaski bkervaski is offline
 
Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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Yaw damper?
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  #3  
Old 03-05-2020, 03:21 PM
tdavis1198 tdavis1198 is offline
 
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Location: Toronto, Ontario
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No yaw damper
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  #4  
Old 03-05-2020, 03:29 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Check the friction value in your nose wheel fork.
It is probably too loose.
Spiral prop wash moves the nose wheel in flight which changes rudder trim.
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  #5  
Old 03-05-2020, 07:01 PM
tdavis1198 tdavis1198 is offline
 
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Sounds logical. Thanks
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  #6  
Old 03-13-2020, 03:22 PM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 57
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I had the exact same problem. It was the breakout force on the nose gear. Tighten it up and the nose gear will not swing left or right due to prop wash. It was very disconcerting to feel the plane yaw uncommanded. Very simple problem to fix
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  #7  
Old 03-13-2020, 05:14 PM
A-Ron A-Ron is offline
 
Join Date: Jul 2014
Location: Trinidad, CA
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I wouldn't just "tighten" it. I would go back to the instructions and follow it. I think it was 26 lbs using a fish scale with the scale attached to a specific point on the castor.
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  #8  
Old 07-04-2020, 04:12 PM
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catmandu catmandu is offline
 
Join Date: Dec 2005
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Another search function win! I am going to set proper breakout force on a -10 to fix a wandering ball. Lots easier than installing a rudder trim servo, but there are some nice options I will file away for possible future use.

Never would have thought of this particular fix, thanks VAF!
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