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nuckolls.bob(at)aeroelect
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 Posted: Thu Apr 26, 2018 8:30 am Post subject: Magnetomer |
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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: 1929
Location: Riley TWP Michigan
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| Posted: Thu Apr 26, 2018 11:28 am Post subject: Re: Magnetomer |
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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: 738
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| Posted: Thu Apr 26, 2018 6:50 pm Post subject: Magnetomer |
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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 . . .
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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