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Magnetometer

 
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nuckolls.bob(at)aeroelect
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PostPosted: Fri Apr 27, 2018 5:22 am    Post subject: Magnetometer Reply with quote

At 07:23 AM 4/27/2018, you wrote:

Quote:
Bob,

I originally mounted my Magnetometer as far back in the fuselage and on the bottom skin ( right between the rudder cables ). Before I moved it I could pull the plane out away from the hangar and sitting still move the rudder from stop to stop and get over 200 degrees swing on the compass. Reverse and the compass would swing the opposite way. It did not matter if the engine was running or not. We spent several hours trying to degauss the cables. We used a degauss coil for older TV's, a solder gun, and even wrapped our own version of a coil. As far as we cold tell nothing we did had much ( if any ) impact on the amplitude of the compass error. I have swung the compass several times since relocating the magnetometer and it is very accurate.

Great news and excellent data. Thank you. Your
observations confirm the latest hypothesis for
dimple distortion of earth flux by the cables
as opposed to magnetized cables.


Bob . . .


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alec(at)alecmyers.com
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PostPosted: Fri Apr 27, 2018 11:30 am    Post subject: Magnetometer Reply with quote

Your dimple distortion is officially called a “soft iron” error.

On Apr 27, 2018, at 09:21, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
At 07:23 AM 4/27/2018, you wrote:

Quote:
Bob,

I originally mounted my Magnetometer as far back in the fuselage and on the bottom skin ( right between the rudder cables ). Before I moved it I could pull the plane out away from the hangar and sitting still move the rudder from stop to stop and get over 200 degrees swing on the compass. Reverse and the compass would swing the opposite way. It did not matter if the engine was running or not. We spent several hours trying to degauss the cables. We used a degauss coil for older TV's, a solder gun, and even wrapped our own version of a coil. As far as we cold tell nothing we did had much ( if any ) impact on the amplitude of the compass error. I have swung the compass several times since relocating the magnetometer and it is very accurate.

Great news and excellent data. Thank you. Your
observations confirm the latest hypothesis for
dimple distortion of earth flux by the cables
as opposed to magnetized cables.


Bob . . .


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 659

PostPosted: Fri Apr 27, 2018 5:47 pm    Post subject: Magnetometer Reply with quote

​Bobby:
When you degaussed the rudder cable..  Did you degaussed the rudder Horn?
The cables even being S/S will have some ferrous in them.  However the HORN is all ferrous steel and so is the vertical rudder bracket.
BUT!  I would get the magnetometer off the belly and away from the cables and I'm guessing you have your Altitude Hold A/P back there also.  It probably has a large PM motor.   
Are you installing a Garmin G5 system?
Barry


On Fri, Apr 27, 2018 at 8:23 AM, Bobby Paulk <bobbypaulk(at)comcast.net (bobbypaulk(at)comcast.net)> wrote:
Quote:

Bob,

I originally mounted my Magnetometer as far back in the fuselage and on the bottom skin ( right between the rudder cables ). Before I moved it I could pull the plane out away from the hangar and sitting still move the rudder from stop to stop and get over 200 degrees swing on the compass. Reverse and the compass would swing the opposite way. It did not matter if the engine was running or not. We spent several hours trying to degauss the cables. We used a degauss coil for older TV's, a solder gun, and even wrapped our own version of a  coil. As far as we cold tell nothing we did had much ( if any ) impact on the amplitude of the compass error. I have swung the compass several times since relocating the magnetometer and it is very accurate.

Bobby

Zodiac 601  295 hrs.



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