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Magnetomer

 
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nuckolls.bob(at)aeroelect
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PostPosted: Thu Apr 26, 2018 8:30 am    Post subject: Magnetomer Reply with quote

At 07:29 AM 4/26/2018, you wrote:

Quote:
I tried most of the suggestions listed but finally had to move the magnetometer as high as I could from the rudder cables. Right behind the baggage compartment was great. I have never had a compass as accurate. You can also change the cables to a good grade of Stainless ( non magnetic ) Steel.

Keep your cables far away from a DC welding machine while building.

Upon further pondering of your observations
and success, I'm now thinking that the cables
were probably not magnetized. If they are
MAGNETIC . . . meaning that they are attracted
to a magnet . . . then they are capable of
DISTORTING an external magnetic field (earth
flux) without being magnetized.

This condition seems more likely . . .

Mounting earth flux sensors of any strip
on or within vehicles has been fraught with
challenges. Most of our experience with
aluminum and plastic airplanes has been pretty
benign but there are occasional exceptions.
Had a guy on the List a few years back that
had a badly magnetized fuselage frame for
a rag-n-tube airplane.

From what you've shared here, it's almost
a certainty that degaussing the cables would
have not been useful. Further, the problem
you observed and worked around was a simple
distortion due to proximity.

Thanks for sharing!



Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1208
Location: Riley TWP Michigan

PostPosted: Thu Apr 26, 2018 11:28 am    Post subject: Re: Magnetomer Reply with quote

Just as electricity takes the path of least resistance, so do magnetic lines of force. Even if steel cables are not magnetized, the earth's magnetic field will concentrate in the cables and follow them instead of going through the air. There are driveway alarm sensors that detect a change in the earth's magnetic field when a vehicle passes by.

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Joe Gores
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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 659

PostPosted: Thu Apr 26, 2018 6:50 pm    Post subject: Magnetomer Reply with quote

DUH!
On Thu, Apr 26, 2018 at 12:29 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
At 07:29 AM 4/26/2018, you wrote:

Quote:
I tried most of the suggestions listed but finally had to move the magnetometer as high as I could from the rudder cables. Right behind the baggage compartment was great. I have never had a compass as accurate. You can also change the cables to a good grade of Stainless ( non magnetic ) Steel.

Keep your cables far away from a DC welding machine while building.

   Upon further pondering of your observations
   and success, I'm now thinking that the cables
   were probably not magnetized. If they are
   MAGNETIC . . . meaning that they are attracted
   to a magnet . . . then they are capable of
   DISTORTING an external magnetic field (earth
   flux) without being magnetized.

   This condition seems more likely . . .

   Mounting earth flux sensors of any strip
   on or within vehicles has been fraught with
   challenges. Most of our experience with
   aluminum and plastic airplanes has been pretty
   benign but there are occasional exceptions.
   Had a guy on the List a few years back that
   had a badly magnetized fuselage frame for
   a rag-n-tube airplane.

   From what you've shared here, it's almost
   a certainty that degaussing the cables would
   have not been useful. Further, the problem
   you observed and worked around was a simple
   distortion due to proximity.

   Thanks for sharing!



  Bob . . .


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