Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 02-13-2021, 04:59 PM
Phenomflyer237 Phenomflyer237 is offline
Join Date: Oct 2017
Location: Sarasota Florida
Posts: 24
Default GMU 11 mounting

Hi all whats the best location to mount a GMU 11 in a RV6 slider with vernier trim?
pictures would be great! This is a flying aircraft not in the project state
Reply With Quote
Old 02-13-2021, 09:23 PM
terrye terrye is offline
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 929
Default GMU 11 mounting

Don't have pictures, but I mounted mine on the aft deck just in front of the vertical and horizontal stabilizer. It's mounted transversely with the mounting flange up against the aft bulkhead. There's just enough room for the mounting screws beside the lightening holes on the aft deck. GMU 11 can be mounted in d-sub fwd, d-sub aft, or d-sub to the left or right, but must be calibrated in whatever position you choose.
Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
Reply With Quote
Old 02-13-2021, 09:42 PM
Dave S Dave S is offline
Join Date: Nov 2018
Location: Eagan, MN
Posts: 54

I have an RV 7 and thats where eI put mine just where Terry said.
The other acceptable option is in the wing tip.

I believe in the Garmin G3X Install manual it lists best locations for the GMU 11.

Appendix B form the manual;
B.2 Van’sAircraft
B.2.1 RV-7/9
The typical GMU magnetometer mounting location in RV-7/9 aircraft is in the aft fuselage, on the aft deck (F-714), just ahead of the horizontal stabilizer and just aft of the F-709 bulkhead. This location provides a level pitch and roll reference, and acceptable separation from excessive magnetic disturbances in typical RV-7/9 aircraft.
The wingtip can be used as an alternate GMU magnetometer mounting location for RV aircraft. Ensure adequate separation from steel aileron counterweights, transmitting antennas, and lighting fixtures, and follow the wingtip light wiring guidance for in Section 15.4 or Section 16.4.
Dave S
Eagan, MN

Wings- Lower Skins to go
Fuselage- In progress
Tail Wheel Endorsement-
RV Familiarization-

Last edited by Dave S : 02-13-2021 at 09:47 PM.
Reply With Quote
Old 02-13-2021, 09:45 PM
mfleming's Avatar
mfleming mfleming is offline
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 663

RV-7 - I'm not flying yet but I'm also mounting the GMU 11 on the aft deck. The unit is straddling the right lightning hole. The connector comes up through the left lightning hole. All stainless hardware of course.
Attached Thumbnails
Click image for larger version

Name:	gmu11.jpg
Views:	67
Size:	125.1 KB
ID:	8356  
Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
Reply With Quote
Old 02-13-2021, 11:04 PM
Z-EDD's Avatar
Z-EDD Z-EDD is offline
Join Date: Oct 2013
Location: Harare, Zimbabwe
Posts: 214

I mounted mine aft as others have but was also concerned about my manual trim since it is quite unusual these days. I asked Steinair about their experience and they said they had done several here with manual trim and had no problems. Sure enough mine calibrated just fine. No pictures but it is similar to Mikeís above the right lightening hole with the trim cable coming up through the left. Donít forget to plan for the connector which is nearly as big as the unit itself!
Ed Fleming
RV-7- Flying as of 12/23/20
Harare, Zimbabwe
Reply With Quote
Old 02-14-2021, 08:42 AM
Raymo's Avatar
Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,308

Garmin recommends the location specified by others for RVs. Type certified planes (e.g. Piper), they want it in a wing due to all the ferrous metal in the fuselage.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Reply With Quote
Old 02-14-2021, 03:40 PM
Martyrv6a Martyrv6a is offline
Join Date: Jan 2005
Posts: 111

I too mounted mine on the aft deck in my -6A but it is underneath using spacers and longer screws to “hang” from the deck. It’s on C/L with connector forward. I was think it might be better protected from weather given the empannage fairing is all that covers this area. Two + years and going strong.
Reply With Quote
Old 02-14-2021, 03:58 PM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
Join Date: Jan 2005
Location: NC25
Posts: 3,633
Default 4+ years

My GMU-11 has been mounted and flying on the rear deck for 4+ years. Would need to look in the logbook to know exactly how long.

Click image for larger version

Name:	2020-07-04
Views:	43
Size:	195.5 KB
ID:	8372

Click image for larger version

Name:	2020-07-04
Views:	39
Size:	220.4 KB
ID:	8373

Click image for larger version

Name:	2020-07-04
Views:	40
Size:	204.2 KB
ID:	8374

No interference with the manual trim cable and calibrated well.
Gary A. Sobek
NC25 RV-6
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.
Reply With Quote
Old 02-14-2021, 08:44 PM
rapid_ascent rapid_ascent is offline
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,427

I mounted mine using a bracket similar to mfleming. I made my own bracket, but Stein sells one. I turned mine so the connector on the GMU 11 is sticking through the bulkhead lightening hole. That way I didn't have to drill another hole to route the cabling.
Attached Thumbnails
Click image for larger version

Name:	GMU-11_intstall_2.jpg
Views:	44
Size:	236.8 KB
ID:	8386  
Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete

Last edited by rapid_ascent : 02-14-2021 at 08:49 PM. Reason: add pic
Reply With Quote
Old 02-16-2021, 06:27 PM
RV10Man RV10Man is offline
Join Date: Jan 2005
Location: Oklahoma City, OK
Posts: 1,097

I mounted mine during the build stage. I used the "new" bracket Van's has to mount it on the bulkhead just aft of the baggage compartment bulkhead. You could also use that bracket to mount it in a flying airplane.
N781DM became an airplane 2/8/2021
First flight 03/01/2021
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 01:17 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.