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  #1  
Old 01-11-2021, 11:42 AM
snoop9erdog snoop9erdog is offline
 
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Default GMU 11 Magnetometer

Garmin manuals call out to install the magnetometer with non magnetic tools. Those tools are not easily found.....titanium nut driver, screwdriver, etc. How critical is it that this must be adhered to??

I've mounted the bracket on the wing tip and I'm ready to install and run wires....would literally take me 5 minutes to get er done.....
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  #2  
Old 01-11-2021, 11:49 AM
Desert Rat Desert Rat is online now
 
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I believe you're getting "Non-magnetic" confused with Non-ferrous"

When they say non magnetic tools, they mean (for example) no screwdrivers that use a magnet to hold the bit in place
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  #3  
Old 01-11-2021, 11:52 AM
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What Terry said. Also, non-ferrous hardware. Brass screws recommended or a high quality stainless. If you test a stainless screw with a magnet, don't use it for the install.
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  #4  
Old 01-11-2021, 11:55 AM
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and the same applies to the hardware, non-magnetizable metal screws, nuts and washers. Just use the ones supplied.
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  #5  
Old 01-11-2021, 12:08 PM
snoop9erdog snoop9erdog is offline
 
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Ok yes I should have stated no ferrous tools......but nobody has answered the question. What if i do use a normal ferrous tool? a big deal? Does it screw up the magnetometer innerds?

The installation kit comes with all non ferrous hardware already
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  #6  
Old 01-11-2021, 12:45 PM
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RV6_flyer RV6_flyer is offline
 
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Quote:
Originally Posted by snoop9erdog View Post
Garmin manuals call out to install the magnetometer with non magnetic tools. Those tools are not easily found.....titanium nut driver, screwdriver, etc. How critical is it that this must be adhered to??

I've mounted the bracket on the wing tip and I'm ready to install and run wires....would literally take me 5 minutes to get er done.....
I installed mine 4 or so years ago with standard tools I have in my tool box. USE the hardware that Garmin supplies and it will work perfect.

NO... You do not need special tools to install. Just make sure there is no steel in anything near where you mount it.
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  #7  
Old 01-11-2021, 01:39 PM
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mfleming mfleming is offline
 
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I'm working on installing my GMU 11 right now.

This is how I deal with the non-magnetic tool issue. For instance I needed to use a #1 Philips...I placed the tip of my #1 into a drawer of very light washers, the screw driver did not disturb them in the least. Ergo, not magnetic
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  #8  
Old 01-11-2021, 02:51 PM
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Default GMU 11 Installation

Quote:
Originally Posted by snoop9erdog View Post
Ok yes I should have stated no ferrous tools......but nobody has answered the question. What if i do use a normal ferrous tool? a big deal? Does it screw up the magnetometer innerds?

The installation kit comes with all non ferrous hardware already
This has caused problems in the past, it can introduce interference into the immediate vicinity of the very sensitive GMU 11 magnetometer. Your system would likely throw a Mag Anomaly flag some or all of the time, and because the GMU 11 feeds information to the GSU 25 ADAHRS, its resulting output can be degraded.

Thanks,

Justin
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  #9  
Old 01-11-2021, 07:23 PM
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Av8torTom Av8torTom is offline
 
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Default GMU 11

I'm mounting my GMU 11 in the wingtip, and I'll be using nutplates to attach the wing tip to the wing. Will there cause interference?

Thanks
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  #10  
Old 01-11-2021, 08:38 PM
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mfleming mfleming is offline
 
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Quote:
Originally Posted by Av8torTom View Post
I'm mounting my GMU 11 in the wingtip, and I'll be using nutplates to attach the wing tip to the wing. Will there cause interference?

Thanks
According to Garmin, yes, but I'm not sure what you would do different.

This is right out of the G3X installation manual. Page 15-3

"Use nonmagnetic materials to mount the GMU 11, and replace any magnetic fasteners within 0.5 meter
with nonmagnetic equivalents (e.g. replace zinc-plated steel screws used to mount wing covers or wing tips
with nonmagnetic stainless steel screws)."
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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

Last edited by mfleming : 01-11-2021 at 08:40 PM. Reason: grammar
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