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Old 06-04-2014, 12:03 PM
Boomer506 Boomer506 is offline
Join Date: Apr 2014
Location: Stanwood, WA
Posts: 145
Default Roll servo installation

I'm getting ready to close my wings and would like a picture of someone's roll servo installation, preferably on an RV8. I am leaning towards a Dynon autopilot but will likely fly for a couple years before I install. I'm a repeat offender with a previous RV6 completion.

Basically, I would like to know if I can close up the wing, and install the servo later without too much trouble. Or if I should decide between Garmin and Dynon, spend the $75 for the install kit now.

Thanks for your help out there.
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Old 06-04-2014, 12:08 PM
Pat Hatch's Avatar
Pat Hatch Pat Hatch is offline
Join Date: Jun 2006
Location: Vero Beach, FL
Posts: 889

Sam, the Garmin roll servo is installed in the fuselage should you decide to go that way (RV-6). Wow, I just checked the -8, and the roll servo is in the wing, so disregard my previous statement! Sorry about that.

I will say that it definitely would be an easier to instal the servo mount kit in your wing now before closing it out. I previously had my roll servo in my wing (S-Tec) and converted to the Garmin autopilot with the roll servo in the fuse under the copilot's seat.
Pat Hatch
RV-4 (Gone to RV heaven)
RV-6 (N44PH - Flying)
RV-7 (Sold)
RV-8 (Builder & Avionics Installer) Trim Relay Boards/Flap Actuators (Photography)
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Last edited by Pat Hatch : 06-04-2014 at 12:23 PM. Reason: Correction.
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Old 06-04-2014, 12:39 PM
humptybump humptybump is offline
Join Date: Feb 2011
Location: USA
Posts: 3,180

Originally Posted by Pat Hatch View Post
I just checked the -8, and the roll servo is in the wing
If the Garmin servo has a similar mount to Trutrak or MGL, then the roll servo can go in the fuselage under the pilot seat.

photo is not of my aircraft (found using google search)

Last edited by humptybump : 06-04-2014 at 12:43 PM.
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Old 06-04-2014, 01:53 PM
rotary57 rotary57 is offline
Join Date: Jan 2012
Location: kmvi
Posts: 45

My Garmin roll servo is under the front seat - this is a picture of the Trutrack servo before I swapped it for the Garmin. My aircraft was built in 2003, I don't know if anything has changed since then.

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Old 06-04-2014, 03:02 PM
wirejock's Avatar
wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,371
Default Dynon

My Dynon AP roll servo goes in the wing. One of the two bell crank brackets is replaced with the Dynon bracket. It can be done through the access panel but if you have the skin off, it would be much easier. You have to disconnect the linkage, remove both bellcrank brackets and assemble the servo in the brackets then put it back in. Actually the instructions are written as if it were a finished wing. You can download them to review from Dynon.
I believe the GRT is also in the wing.
Remember the wiring harness has to be pulled in too. Leave a path or buy the wiring kit and pull it in now.
The roll trim servo is in the fuse I think. Not quite there yet.
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.

Last edited by wirejock : 06-04-2014 at 03:09 PM. Reason: add text
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Old 06-04-2014, 03:17 PM
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SmilingJack SmilingJack is offline
Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,105

Originally Posted by humptybump View Post
If the Garmin servo has a similar mount to Trutrak or MGL, then the roll servo can go in the fuselage under the pilot seat.

photo is not of my aircraft (found using google search)
Geez Bumtyhump! I thought for a minute I was your twin

That picture looked real familiar to I know why!
John Mastro
10 years of Awesomeness!
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Old 06-04-2014, 10:55 PM
Rodney Rodney is offline
Join Date: Oct 2012
Location: Friendswood, TX
Posts: 74

I installed the Dynon roll and pitch trim with the AP74 control head recently. The aircraft had over 200 at installation. One of the easiest installs I have managed--particularly the roll servo. The Dynon mounting plate installs rather easily through the stock inspection panel. However, it would be easier installing the mounting plate before the wing is enclosed. Very easy to add the servo later if you choose to install the bracket during the build.

The two bolts that go through the leading edge spar are removed and the mounting bracket added. Installation after the build assumes you followed the Vans plans and used blind nuts during the install. Once the leading edge is on you will not have access to the front of the spar.
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