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Go Back   VAF Forums > Avionics / Interiors / Fiberglass > Autopilots
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  #1  
Old 05-12-2022, 02:11 AM
design4p design4p is offline
 
Join Date: Jul 2018
Location: CORWEN
Posts: 70
Default With Autopilot on right wing sits lower.

Hi,

Whenever, I have Autopilot on, either using a NAV, heading or track the axes (tilt) of the aircraft is slightly lower on the Starboard wing (slightly higher port wing).

However, with the Autopilot not engaged the aircraft is level.

Any suggestions for the cause and correction would be appreciated.

Regards John
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  #2  
Old 05-12-2022, 02:42 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,634
Default

I've seen something similar with my GRT when the ball is not centered. When I center the ball, the wing comes back up.

Which AP are you flying? Is the ball centered?
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  #3  
Old 05-12-2022, 02:52 AM
design4p design4p is offline
 
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Default

The avionics is all Garmin. Not sure about the ball in the 2 scenario's -will check on next flying visit.
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  #4  
Old 05-12-2022, 04:38 AM
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D Weisgerber D Weisgerber is offline
 
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Location: Ionia Michigan
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Default

I agree with Mickey, I've had the same thing when the ball wasn't centered.
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  #5  
Old 05-12-2022, 04:42 AM
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Walt Walt is offline
 
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Default

Yep, roll compensating for a yaw offset.
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  #6  
Old 05-12-2022, 06:04 AM
Tailwind/RVGuy Tailwind/RVGuy is offline
 
Join Date: Dec 2018
Location: Holmen
Posts: 58
Default

Yep--- Ball not centered. When it does that, try to add a little rudder to center the ball and I bet you will see the wing come up.

Keith
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  #7  
Old 05-12-2022, 06:56 AM
edclee edclee is offline
 
Join Date: Aug 2008
Location: Lancaster, SC
Posts: 255
Default Yaw

Does your autopilot have a yaw damper?? If so, maybe that system is not set up right.
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  #8  
Old 05-12-2022, 07:54 AM
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scrollF4 scrollF4 is offline
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Join Date: Jan 2010
Location: Flower Mound, TX
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Default

With the autopilot engaged, you have more electrons in the roll servo and associated wiring. This makes the right wing heavier.



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  #9  
Old 05-12-2022, 10:31 AM
design4p design4p is offline
 
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Default

Hi,

No yaw damper fitted. I will make sure the ball is centred during my next flight and report back.

Regards John
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  #10  
Old 05-12-2022, 11:53 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 2,171
Default Rudder trim

I always wondered about rudder trim on the 7, 8 and 9 series. Curious how many Vans builders have installed rudder trim?
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