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  #1  
Old 04-24-2018, 02:30 PM
TShort TShort is offline
 
Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
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Default Degaussing

I've got the magnetometer for the G3X mounted aft in the tailcone

Today while doing the interference testing it failed massively with minimal rudder movement. Like >500%

Garmin says I need to degauss the rudder cables.

Has anyone done this? What is the best way to do so?
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KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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  #2  
Old 04-24-2018, 02:36 PM
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Mike S Mike S is offline
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Default

Amazon carries a tool for this.
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VAF 909

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Flying as of 12/4/2010

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  #3  
Old 04-24-2018, 02:39 PM
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Raymo Raymo is offline
 
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People often test for ferrous metal with a magnet, which then magnetizes the metal.
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  #4  
Old 04-24-2018, 03:31 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Another potential interference source is the rear seat shoulder harness cables.

A simple backpacking compass can be used to test for unwanted magnetic fields.
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  #5  
Old 04-24-2018, 03:49 PM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Been there done that... I have 2 degausers now because of an RV4, I had to buy the "big bertha" model for the RV4. After spending a bunch of $$ for the big one (weighs about 25 lbs) and having marginal success I finally gave up and put the magnetometer in the wing, problem solved (or at least I finally was able to get it to pass).

I think the wost offender was actually the trim cable and it was a lot easer to relocate the mag than RR the cable to degauss it. I had to call on my weightlifter friend to crawl in the back and I passed him the degausser and he did his best but still failed.

I still had to degauss the wing/aileron/hinge hardware though
I was sweating it for a while as the gear legs were also magnetized and I worked on them for hours.
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  #6  
Old 04-24-2018, 03:52 PM
TShort TShort is offline
 
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Location: Indianapolis, IN (KUMP)
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It has to be the rudder cables; it passes just fine until I move the rudder, and then the thing goes nuts.

We have some leeway (slack) in terms of moving it up, but relocating to the wing would be a nightmare with the CAN bus, etc...
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KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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  #7  
Old 04-24-2018, 05:11 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Degauss tool

I've heard a gun type soldering iron works it have not tried it yet. Basically pass the cable through the space between the solder point loop, pull trigger and slide it along the cable slowly.
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  #8  
Old 04-24-2018, 05:19 PM
TShort TShort is offline
 
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Location: Indianapolis, IN (KUMP)
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Quote:
Originally Posted by wirejock View Post
I've heard a gun type soldering iron works it have not tried it yet. Basically pass the cable through the space between the solder point loop, pull trigger and slide it along the cable slowly.
I saw that somewhere too ... stopped and got one on the way home from the airport just now.

Will report back...
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KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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  #9  
Old 04-24-2018, 05:35 PM
rv7charlie rv7charlie is offline
 
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Location: Pocahontas MS
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Whatever you use, be sure to power it up prior to getting it close to the material. Move it slowly closer, continuing varying movements (circular works), and continue those movements until well away from the material. Only then power it down. Power-up and power-down causes large current/magnetic field excursions, which can re-magnetize your material.

Charlie
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  #10  
Old 04-24-2018, 05:42 PM
Dan B Dan B is offline
 
Join Date: Mar 2006
Location: Edmond, OK
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My shoulder harness cables became magnitized. Had some success using the soldering iron method.
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