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  #1  
Old 01-27-2018, 07:31 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Cleveland Ga
Posts: 460
Default G3X auto pilot servo settings

Looking for the gain and torque settings for the Garmin servos that have worked well for you. Thanks!
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  #2  
Old 01-29-2018, 07:21 AM
rdrcrmatt rdrcrmatt is offline
 
Join Date: Oct 2014
Location: Milwaukee, WI
Posts: 109
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I had an issue with the AP overshooting headings by quite a bit. Garmin suggested I try the following.


75% torque / .8 gain on ROLL
79% torque / 1.3 gain for Pitch


I wish I would have documented the before setting. It's better now, but still overshoots a little.
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  #3  
Old 01-29-2018, 07:27 AM
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g3xpert g3xpert is offline
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 1,957
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Hello,

Just a reminder that Appendix A of the Rev. AD G3X/G3X Touch Installation Manual is called FLIGHT TEST PLAN FOR AUTOPILOT TUNING and includes pretty comprehensive autopilot tuning instructions for anyone wanting to make improvements to the default settings.

Let us know if you have questions.

Thanks,
Steve
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  #4  
Old 01-29-2018, 08:05 AM
868RM 868RM is offline
 
Join Date: Oct 2009
Location: lena, il.
Posts: 267
Default Setting

I needed to make very small changes and wait at least a minute before next change.It is very easy to go right past the best setting.
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  #5  
Old 01-31-2018, 08:51 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Cleveland Ga
Posts: 460
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I noticed that on the Van’s WEB site for the RV 14, they have recommended setting for the Garmin Auto Pilot system. I wonder how much difference between the -14 and the -10 would be with the same settings.
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  #6  
Old 02-01-2018, 04:22 PM
Dorfie Dorfie is offline
 
Join Date: Aug 2009
Location: Lexington, KY
Posts: 432
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Togaflyer,
Here are the settings I started out on and mostly still the same.

ROLL SERVO:
Gain 0.8
Max Torque 100%
Fine adjust amount 0.0
Fine adjust time 0.2 ( I think this was not available on my G3X system but not sure. Will have to check)

PITCH SERVO:
Max torque 100%
Gain 2.5
Fine adjust amount 1.0
Fine adjust time 0.2

PITCH GAIN:
Min AS 70Kts
Max AS 180Kts
Vert speed gain 1.4
Vert accel gain 1.0
Airspeed gain 1.35
Airspeed accel gain 1.0

I have reduced the Pitch servo gain over time to smooth altitude hold from 2.5 to (from memory) around 1.8. The servo pitch changes were too abrupt in level flight to my liking.
I occasionally have a little hunting in HDG and NAV mode. I have not been able to correct that. It only happens once in a while and usually on longer flights. When it does this it will overshoot the initial set heading by about 5 degrees, turn back on correct heading fairly quickly. It will then slowly rock the wings while not noticeably going off heading. Maybe someone can help me with this issue.

Hope this helps.

Johan
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  #7  
Old 02-02-2018, 01:27 PM
rcoleman-10 rcoleman-10 is offline
 
Join Date: Apr 2017
Location: Bastrop, TX
Posts: 8
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Johan, I have the same HDG hunting problem. Happens on long flights, turbulence, or steady cross wind......can't seem to lock it in...I hope we can find more input on how to solve.

Ron
RV-10
Austin, Tx
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