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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.


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

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?
Mickey Coggins
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Old 05-12-2022, 02:52 AM
design4p design4p is offline
Join Date: Jul 2018
Location: CORWEN
Posts: 70

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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Old 05-12-2022, 04:38 AM
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D Weisgerber D Weisgerber is offline
Join Date: Sep 2019
Location: Ionia Michigan
Posts: 331

I agree with Mickey, I've had the same thing when the ball wasn't centered.
Dave Weisgerber
RV8 N848DW. Ser#83830 done.
James Cowl
DAR inspection on 7-23-2021
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Old 05-12-2022, 04:42 AM
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Walt Walt is offline
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,609

Yep, roll compensating for a yaw offset.
Walt Aronow, DFW, TX (52F)

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Old 05-12-2022, 06:04 AM
Tailwind/RVGuy Tailwind/RVGuy is offline
Join Date: Dec 2018
Location: Holmen
Posts: 58

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 in Lacrosse WI area
Finished Wittman Tailwind in 2016
Flew RV9A and RV6a while building
lurking for years but now paid
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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.
Sonex/Corvair 2016 Finished, Sold 2020
RV-9A 2005 Purchased
IO-320 160 hp
Exempt but happily paid for 2022
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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
Posts: 1,691

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

Just kidding. Couldn’t resist.

Sid "Scroll" Mayeux, Col, USAF (ret)
52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
"KELLI GIRL" N260KM RV-7A tipper

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Old 05-12-2022, 10:31 AM
design4p design4p is offline
Join Date: Jul 2018
Location: CORWEN
Posts: 70


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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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?
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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