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skydiver15
Joined: 12 Feb 2010
Posts: 1
Location: Ophelia, VA
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 Posted: Wed Sep 02, 2015 10:44 am Post subject: Tesla Meter App and Magnetism |
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About a year ago when flying my RV-9A to Air Venture, I noticed after departing a small airport in Ohio and preparing to fly over Lake Michigan, that my vertical card compass was stuck on 230 degrees. I used the GPS heading to reorient my DG and went on my way…
Upon returning home, I decided to replace that compass with one mounted on the center support to the roll bar. Same problem – stuck on 230 degrees + or – 10 degrees.
Now in the middle of upgrading from steam gauges to Dynon 180, etc., I ran across an Iphone App called Tesla Meter on the App store. There are at least 10 similar apps that point to a source of magnetism and give a strength reading in a measurement referred to as µT. Moving it around the cockpit, the signal was very strong and pointed to the junction of the roll bar and fuselage – readings of approximately 500 µT on the both the left and right junctions of the fuselage and the roll bar. The remainder of the roll bar and the support showed readings of 60 to 70 µT. While I was at it, I checked other steel pieces around the plane and found two bars on the motor mount with readings in the 400+ µT range.
Knowing this group is far more informed than I am, I pose the following questions:
<![if !supportLists]>1. <![endif]> Is the high reading at the mounting points of the roll bar the likely cause of the stuck compass?
<![if !supportLists]>2. <![endif]>Can you offer an explanation as the why those areas show a high reading?
<![if !supportLists]>3. <![endif]>If those areas are the problem, how do I correct it?
Thanks for your help.
Don Johnson
RV-9A
[quote][b]
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Don Johnson
Cessna Cardinal N34108
RV-7A
Ophelia, VA |
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Wed Sep 02, 2015 4:41 pm Post subject: Re: Tesla Meter App and Magnetism |
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I have not actually tried this but a knowledgeable person told me that a soldering gun (NOT iron) can be used to demagnetize steel. The object to be demagnetized is passed through the soldering gun heating element loop while the gun trigger is pulled. Of course an airframe is too big, but maybe the soldering gun heating element can be removed from the gun, then placed around the steel tube, then connected back onto the soldering gun. Then the soldering gun trigger is pulled while moving the gun back and forth along the steel tube.
If that is not feasible, then maybe someone else knows how to make a demagnetizer using the same principle.
Here is a youtube movie about making a demagnetizer:
https://www.youtube.com/watch?v=8kKTJQTyX-w
Joe
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Joe Gores |
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ceengland7(at)gmail.com
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| Posted: Wed Sep 02, 2015 5:43 pm Post subject: Tesla Meter App and Magnetism |
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On 9/2/2015 7:41 PM, user9253 wrote:
| Quote: |
I have not actually tried this but a knowledgeable person told me that a soldering gun (NOT iron) can be used to demagnetize steel. The object to be demagnetized is passed through the soldering gun heating element loop while the gun trigger is pulled. Of course an airframe is too big, but maybe the soldering gun heating element can be removed from the gun, then placed around the steel tube, then connected back onto the soldering gun. Then the soldering gun trigger is pulled while moving the gun back and forth along the steel tube.
If that is not feasible, then maybe someone else knows how to make a demagnetizer using the same principle.
Here is a youtube movie about making a demagnetizer:
https://www.youtube.com/watch?v=8kKTJQTyX-w
Joe
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Joe Gores
Find a TV repair shop that's been around since before flat screens (tube
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type days). Ask if they still have their degaussing coil (mine's still
packed away somewhere, after closing the shop 20 years ago).
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ceengland7(at)gmail.com
Guest
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| Posted: Wed Sep 02, 2015 5:45 pm Post subject: Tesla Meter App and Magnetism |
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On 9/2/2015 7:41 PM, user9253 wrote:
| Quote: |
I have not actually tried this but a knowledgeable person told me that a soldering gun (NOT iron) can be used to demagnetize steel. The object to be demagnetized is passed through the soldering gun heating element loop while the gun trigger is pulled. Of course an airframe is too big, but maybe the soldering gun heating element can be removed from the gun, then placed around the steel tube, then connected back onto the soldering gun. Then the soldering gun trigger is pulled while moving the gun back and forth along the steel tube.
If that is not feasible, then maybe someone else knows how to make a demagnetizer using the same principle.
Here is a youtube movie about making a demagnetizer:
https://www.youtube.com/watch?v=8kKTJQTyX-w
Joe
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Joe Gores
Add to my previous post: don't forget to remove the compass & anything
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else that might get trashed by a big magnetic field (AHARS units,
magnetometers, etc).
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Wed Sep 02, 2015 7:00 pm Post subject: Re: Tesla Meter App and Magnetism |
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Found this on the internet about demagnetizing:
| Quote: | | What if you could put many wraps of insulated wire around the pipe and connect an AC welder to the wire. The longer the wire the better and of course the wire will have to handle the amps you feed it with the welder. Move the coil of wire down the length of the pipe. Don't see why this wouldn't work. LOL George |
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Joe Gores |
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Wed Sep 02, 2015 8:04 pm Post subject: Tesla Meter App and Magnetism |
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I would suggest also posting to the RV list. I don't know a lot about
it but
a few years ago I read many posts regarding degaussing canopy frames.
I think the people built their own degaussers even, perhaps. I guess a lot
of the RV's with metal frames had some residual magnetism and people would
degauss them and get them back to much less magnetic.
Also, maybe try searching the matronics archive via the web login.
Tim
On 9/2/2015 7:41 PM, user9253 wrote:
| Quote: |
I have not actually tried this but a knowledgeable person told me that a soldering gun (NOT iron) can be used to demagnetize steel. The object to be demagnetized is passed through the soldering gun heating element loop while the gun trigger is pulled. Of course an airframe is too big, but maybe the soldering gun heating element can be removed from the gun, then placed around the steel tube, then connected back onto the soldering gun. Then the soldering gun trigger is pulled while moving the gun back and forth along the steel tube.
If that is not feasible, then maybe someone else knows how to make a demagnetizer using the same principle.
Here is a youtube movie about making a demagnetizer:
https://www.youtube.com/watch?v=8kKTJQTyX-w
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=446707#446707
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jimkale(at)roadrunner.com
Guest
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| Posted: Wed Sep 02, 2015 8:38 pm Post subject: Tesla Meter App and Magnetism |
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Way back when TVs had large Picture Tubes, more properly called cathode ray
tubes, technicians had coils of wire plugged into 110 volt AC. They waved
them all over the television metal chassis. This alternating magnetic field
demagnetized the TV. Also called degaussing. Magnetic fields on the TV
Chassis would distort the picture. This system could also be used on the
metal parts of an airplane. However, if you don't know what you are doing,
you could easily demagnetize some parts that need their magnetic fields to
operate properly. Yes, like the compass, but possibly also some delicate
and expensive avionics. Let the experimenter beware!!
--
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Thu Sep 03, 2015 5:34 am Post subject: Re: Tesla Meter App and Magnetism |
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Electric welding on steel often leaves residual magnetism problems.
Yes, the solution is an AC powered degaussing coil.
Yes, remove your instruments and radios beforehand. Or forget the whole thing and move your compass to a location where it is less affected.
Google how to make a degaussing coil. Careful, most coils get HOT rather quickly. Besides burning your fingers, the coils can melt their wire insulation, burn and cause a short circuit. Most degaussing coils will self-destruct if left powered on too long. Power your coil from a GFCI protected circuit - or mount a household GFCI in an outlet box with a line cord (your own GFCI protected extension cord).
SLOWLY move the degaussing coil in a circular motion all around the affected area. While the coil is still energized, slowly move the coil away from the steel. You MUST SLOWLY move the energized coil AWAY from the affected area. Remember that the degaussing coil IS an electromagnet (without a core) and you can magnetize (make it worse or change magnetic polarity) just as easily as demagnetize.
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Test for excessive magnetic attraction using a handheld compass. Repeat degaussing steps as necessary.
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N20DG
Joined: 02 Jan 2008
Posts: 61
Location: lancaster, texas
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| Posted: Thu Sep 03, 2015 6:06 am Post subject: Tesla Meter App and Magnetism |
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In the olden days we used to take a piece of wire that just fit in place of the heating element and the length we needed to do the job for that purpose. Worked good
Dick
In a message dated 9/3/2015 8:55:08 A.M. Central Daylight Time, fransew(at)gmail.com writes:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
I have not actually tried this but a knowledgeable person told me that a soldering gun (NOT iron) can be used to demagnetize steel. The object to be demagnetized is passed through the soldering gun heating element loop while the gun trigger is pulled. Of course an airframe is too big, but maybe the soldering gun heating element can be removed from the gun, then placed around the steel tube, then connected back onto the soldering gun. Then the soldering gun trigger is pulled while moving the gun back and forth along the steel tube.
If that is not feasible, then maybe someone else knows how to make a demagnetizer using the same principle.
Here is a youtube movie about making a demagnetizer:
https://www.youtube.com/watch?v=8kKTJQTyX-w
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=446707#446707===============================================
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[quote][b]
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