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Old 01-06-2020, 09:56 AM
philfoshee philfoshee is offline
Join Date: May 2019
Location: Woodinville
Posts: 6
Default Electric Aileron Trim

I have an RV8 wing kit with electric aileron trim which uses a tab on the aileron instead of the spring system that is currently available from Vans. Any opinions as to which system is better? I haven't installed the trim kit and could change if the new systems were better.
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Old 01-06-2020, 10:53 AM
fl-mike's Avatar
fl-mike fl-mike is offline
Join Date: Jul 2005
Posts: 1,333

The spring bias system is just "okay".
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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Old 01-06-2020, 12:33 PM
Bob Martin's Avatar
Bob Martin Bob Martin is offline
Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,222

The spring system is not "better" just different. IMHO.
The aileron tab is crisp, visable and repeatable. But does hang out on the exterior of the plane.
The spring system is dependant on the spring being pulled by a servo.
I retrofitted the trim tab system in my -6 before I repainted. A harder job than the spring bias system, but I like it very much.
Bob Martin
RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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Old 01-06-2020, 12:53 PM
Hwood Hwood is offline
Join Date: Feb 2005
Location: Central Alabama
Posts: 302

I had a spring system on my last -8 and had no issues...worked well! Doing the same on the one I'm building now.
N469SH / "Crazy Woman" (sold)
Working on Another -8
Exempt but paid
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Old 01-06-2020, 02:29 PM
RV8JD's Avatar
RV8JD RV8JD is offline
Join Date: Jan 2005
Posts: 917
Default or ...

Something to consider: My previous RV-8 had the spring system, which worked well to compensate for a slightly heavy left wing. It had no autopilot so was always hand-flown.

My current RV-8 has no aileron trim system. It does not have a heavy wing and I switch fuel tanks every 30 minutes. I do fly a fair amount on autopilot where any lateral imbalance is automatically taken care of, but it's not an issue when hand-flying either. Although I thought I would miss the aileron trim, turns out I really haven't.

The side-by-side airplanes may have a greater need for aileron trim when flown solo, than airplanes with centerline seating do.
Carl N.
Arlington, WA (KAWO)
RV-8, 785 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflugel Standard Libelle 201B - Sold
Rolladen-Schneider LS1-f - No longer owned

Last edited by RV8JD : 01-06-2020 at 03:02 PM.
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Old 01-06-2020, 03:40 PM
philfoshee philfoshee is offline
Join Date: May 2019
Location: Woodinville
Posts: 6

Thanks to each of you for your feedback to my question. Since I have the trim tab system I will plan to install that.
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Old 01-06-2020, 03:41 PM
Pilot135pd's Avatar
Pilot135pd Pilot135pd is offline
Join Date: Jan 2019
Location: Vaca Moo Airport - TA37 in East TEXAS
Posts: 1,331

I have the spring system and when I bought it the spring was disconnected (on purpose) so after flying a little I decided to install it to see the difference. I used it for a few flights then forgot I had it and when I fly I rarely use it at all anymore. I might just remove it all this month during Condition Inspection because every little pound helps !
RV-8 N52VM: OnSpeed Gen2 AOA-3D, Dynon D-180, Autopilot, Titan 0-360A1A, Hartzell C/S, INS-429 IFR & GPS496, WingX & Stratux for backup & ADS-B IN. Enjoying life while building an airpark with FREE campsite for pilots

Exempt by 3 out of the 10 ways but I still donated.
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Old 01-06-2020, 03:59 PM
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DanBaier DanBaier is offline
Join Date: Mar 2009
Location: Rochester NY
Posts: 668

I have the spring system in a 7A. Set to neutral and pretty much something to forget (a little over 10 years in the air) it if you manage the fuel burn equally.

RV7A (N7101) - Flying 10/2008
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