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05-12-2022, 02:11 AM
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Join Date: Jul 2018
Location: CORWEN
Posts: 70
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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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05-12-2022, 02:42 AM
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Join Date: Feb 2005
Location: LSGY
Posts: 4,634
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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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05-12-2022, 02:52 AM
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Join Date: Jul 2018
Location: CORWEN
Posts: 70
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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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05-12-2022, 04:38 AM
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Join Date: Sep 2019
Location: Ionia Michigan
Posts: 331
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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
First flight on 7-25-2021
Phase 2 on 9-3-2021
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05-12-2022, 04:42 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,609
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Yep, roll compensating for a yaw offset.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags, MTV-9 prop
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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05-12-2022, 06:04 AM
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Join Date: Dec 2018
Location: Holmen
Posts: 58
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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
__________________
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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05-12-2022, 06:56 AM
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Join Date: Aug 2008
Location: Lancaster, SC
Posts: 255
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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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05-12-2022, 07:54 AM
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Moderator, Asst. Line Boy
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Join Date: Jan 2010
Location: Flower Mound, TX
Posts: 1,691
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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. 
__________________
Scroll
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
Exemption waived.
Proud and grateful 2022 -=VAF=- Contributor
PS: I am not an influencer. I have no influence. Just ask my kids.
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05-12-2022, 10:31 AM
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Join Date: Jul 2018
Location: CORWEN
Posts: 70
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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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05-12-2022, 11:53 AM
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Join Date: Jan 2016
Location: Southwest
Posts: 2,171
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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.
Dues paid 2022, worth every penny
RV9A- Status:
98% done, 2% left to go
Structure done (less gear)
Electrical/Panel done
Firewall Forward 95% done
Fiberglass 70%
www.pilotjohnsrv9.blogspot.com
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