VansAirForceForums  
Home > VansAirForceForums

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

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 01-01-2020, 04:12 PM
Jimmie Kemp Jimmie Kemp is offline
 
Join Date: Dec 2019
Location: St Johns, MI
Posts: 1
Default RV8 going IFR

I'm installing a pair of garmin G5s and a GNX 375 in my RV8. I would like some advice on where to mount the garmin antenna and magnetometer. Thank you.
Reply With Quote
  #2  
Old 01-02-2020, 12:25 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,315
Default Magnetometer

Quote:
Originally Posted by Jimmie Kemp View Post
I'm installing a pair of garmin G5s and a GNX 375 in my RV8. I would like some advice on where to mount the garmin antenna and magnetometer. Thank you.
For the Magnetometer, I went with the end of the left wing. I've got a GRT, so not 100% sure that Garmin wants theirs to be as far away from ferrous metal like GRT, but physics are physics.

The magnetometer is attached with double sided tape inside the 2nd hole in this picture.



I hope the flyleds in the wing tip does not have any impact - have not yet tested that.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #3  
Old 01-02-2020, 12:40 AM
tgmillso tgmillso is offline
 
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 841
Default

I have flyled's nav/strobe in the tips and baja squadron pro landing lights with the Garmin magnetometer mounted on a right angle bracket mounted to the ribs at the mainspar. Works fine. No interference. My understanding is that you don't want to go too far aft as the aileron counterbalance can cause problems.
Sorry, but I can't find a pic of the install.

Tom.
RV-7 (but same wing as the 8)
Reply With Quote
  #4  
Old 01-02-2020, 12:49 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,315
Default no interference

Quote:
Originally Posted by tgmillso View Post
I have flyled's nav/strobe in the tips and baja squadron pro landing lights with the Garmin magnetometer mounted on a right angle bracket mounted to the ribs at the mainspar. Works fine. No interference. ...
Thanks for the pirep Tom.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #5  
Old 01-02-2020, 02:17 AM
Dan 57's Avatar
Dan 57 Dan 57 is offline
 
Join Date: Sep 2018
Location: LSZF
Posts: 807
Default

Quote:
a pair of garmin G5s and a GNX 375
No -8, but just finished the same install on my -6. OAT sensor in the right wing, access thru the aileron bellcrank panel. The magnetometer is installed according specific type recommendations, see end of the IM, on the flat sheet on the fuse between the leading edges of the HS. All ground tests and calibrations ok, no interference. Installed the WAAS on top fuselage, between the end of the cowling and the windscreen.

All ground tests performed good, now just waiting for the fog to clear to flight test...
__________________
Life's short... Enjoy!

http://www.aerofun.ch

RV-6.9 #25685, slider, O-360-A3A (carb/dual Lightspeed II), MTV-12-B, HB-YLL owner & lover
RV-4 #2062 HB-YVZ airframe builder
Reply With Quote
  #6  
Old 01-02-2020, 09:19 AM
g3xpert's Avatar
g3xpert g3xpert is offline
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 3,096
Default GMU 11 Installation

Quote:
Originally Posted by Jimmie Kemp View Post
I'm installing a pair of garmin G5s and a GNX 375 in my RV8. I would like some advice on where to mount the garmin antenna and magnetometer. Thank you.
Hi Jimmie,

The GMU 11 is an extremely sensitive magnetic sensor, so it is important to choose a suitable installation location, and properly align the unit when installing it. This table outlines the recommended separation from various types of magnetic interference.



You can basically use this as a way to prioritize what is most important to avoid. For a wing mounted unit, it will be important that any lights installed in the wing are not grounded to the air frame out in the wing. You will want to run a dedicated ground return back to the fuselage. Also any electrical conductor running through the wing, should be twisted, shielded, and routed as far away from the GMU 11 and its wiring harness as feasibly possible.

Feel free to reach out to us directly if you have any other questions that come up.

Thanks,

Justin
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.

Last edited by g3xpert : 01-02-2020 at 01:34 PM. Reason: Broken Photo link
Reply With Quote
  #7  
Old 01-02-2020, 10:34 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,604
Default

Quote:
Originally Posted by g3xpert View Post
....Also any electrical conductor running through the wing, should be twisted, shielded, and routed as far away from the GMU 11 and its wiring harness as feasibly possible.
I'm not sure why shielding other wires would be needed since that is for e-fields. Twisting load conductors with the return current conductor makes sense, but not e-field shielding as a hard requirement for other circuits in the area (they may need shielding for their own reasons, but that is a different matter).

The guidance in Table 15-4 seems a bit "motherhood and apple pie", rather than practical guidance for our compact airframes. Perhaps your EMI engineer can provide some input on the items of most impact. Appendix B seems to indicate good results with the aft fuselage shelf, even though it violates several of the guidance criteria. (trim motor, tailwheel spring and mount, etc.)
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
N184P reserved (RV-8QB)
Reply With Quote
  #8  
Old 01-04-2020, 09:59 PM
Bcone1381 Bcone1381 is offline
 
Join Date: Dec 2015
Location: Chelsea, MI
Posts: 89
Default

Hey g3xprt;

I had a wire harness made up by my avionics supplier to connect my GMU11 to the G5. The harness that serves the GMU11 has a twisted shielded sheathed CAN BUS but the power and ground are individual wires and laced to the CAN BUS. What are your thoughts on that? Seems like I should change that to comply with your advice

Brooks
Reply With Quote
Reply


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 07:39 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.