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  #1  
Old 01-05-2016, 05:51 PM
hesty hesty is offline
 
Join Date: Jul 2010
Location: Boulder City, NV
Posts: 44
Default Seat Belt cable magnetism with ADAHRS...need a fix.

I'm wondering if anyone knows if there is a process to reduce the magnetism of the seat belt cables? I am having a bit of interference with my Dynon D6 and a much less extent, my Skyview. I have mounted the ADAHRS and D6 compass on a cross bar aft of the baggage compartment. The seat belt cables pass about 5 inches from them. I am getting some heading swing if I move the cables around. I am in the build stage of my 7A still, so I am looking for an easy solution if there is one. I have wrapped the cables in two layers of plastic shield, but no help.

Thanks for any ideas.

Chad
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Boulder City, NV
working on wrapping things up before Airport move. RV-7A slider.
Lycoming IO360 engine and MT 3-blade.
(2016 =VAF= Donation made)
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  #2  
Old 01-05-2016, 06:01 PM
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SmilingJack SmilingJack is offline
 
Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,105
Default

Yeah ahve to find a NDT shop and have the person run them through their degauss machine.

I did that with my RV-8 rollbar and it worked great!
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  #3  
Old 01-05-2016, 06:08 PM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,253
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Wrapping in plastic is a waste of time.

If you can find an old bulk magnetic tape eraser you can degaus the cables. These are typically 6" in diameter and 4" tall, and plug into the wall. I used one of these to degaus the roll bar in an RV-8A.

The other option is to find a real SS cables and replace what you have.

Carl
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  #4  
Old 01-05-2016, 06:20 PM
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dynonsupport dynonsupport is offline
 
Join Date: Jun 2005
Location: Woodinville, WA
Posts: 1,499
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An option is to constrain the cables so they can't move around the area of the AHRS. I've seen people use Nylon cable clamps and clamp the cable to the cross bar. We can calibrate out a fixed error, so as long as the cable doesn't move it will be fine.
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  #5  
Old 01-05-2016, 07:07 PM
DennisRhodes DennisRhodes is offline
 
Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 885
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The NDT shops also have a 120V hand held degaussing coil that will demag that cable. I had one at one time and loaned it to an A&P who said it worked perfectly to demag an engine mount that was effecting the onboard compass. If you can locate one you can do it yourself in about 3 minutes. They also have a small meter that will tell you if the magnetism is still there.
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  #6  
Old 01-05-2016, 07:41 PM
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dlloyd3 dlloyd3 is offline
 
Join Date: Jun 2005
Location: Locust, NC
Posts: 443
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Had the same problem. On the passenger side a loose or tight belt would cause 10 degrees or so change. As Dynonsupport said, clamping the cable tight at the baggage bulkhead allowed a good calibration and fixed the problem.
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  #7  
Old 01-05-2016, 08:57 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Fl/Ga
Posts: 766
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Found this out on a goggle search. Get a pistol grip type solder gun, the type that has the wires that extend out and loops at the end. Run the cable through the loop of the two elements. It will demagnetize it. I have done this with drill bits and screwdrivers and it works. Slowly run it through a couple times and done.
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  #8  
Old 01-05-2016, 09:59 PM
wm708 wm708 is offline
 
Join Date: Dec 2007
Location: houston pmt 2014
Posts: 53
Default solder gun

togaflyer
you beat me to that but you need it to plug in and turn on
Bill J
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  #9  
Old 01-06-2016, 09:15 AM
6 Gun 6 Gun is offline
 
Join Date: Jun 2005
Posts: 846
Default shelf

Mount a shelf on one side of the floor under where it located now and move it there.
Bob
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  #10  
Old 01-06-2016, 02:09 PM
hesty hesty is offline
 
Join Date: Jul 2010
Location: Boulder City, NV
Posts: 44
Default

Thanks for all the input! These are some great ideas.
Cheers
Chad
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Boulder City, NV
working on wrapping things up before Airport move. RV-7A slider.
Lycoming IO360 engine and MT 3-blade.
(2016 =VAF= Donation made)
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