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12-11-2012, 02:00 PM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Quote:
Originally Posted by BobTurner
.........The magnetic pole does "wander" with time, in a little understood and hard to predict way. Apparently it has moved back to where it was earlier.
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Thanks, Bob but it was 12-30 for nearly 30 years and it's been roughly ten years as 13-31, and now I hear that only ten years later, it's back to 12-30.
Must be a hard-to-understand thing, but if it kept going in one direction, it could get weird, like 18-36 in 3,000
Thanks,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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12-11-2012, 02:18 PM
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Join Date: Nov 2006
Location: Waco, Texas
Posts: 1,658
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Pierre,
Take a look at this historical map of the magnetic north pole. It's been wandering left and right for years. My guess is it's moving back in the opposite direction.
Phil
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12-11-2012, 02:55 PM
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Join Date: Jan 2012
Location: Strathclair Mb
Posts: 10
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In one of my jobs we actually measure the earth's magnetism. don't be suprised if you wake up some day and the compass says the sun is rising in the north, or any other direction for that matter.
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12-11-2012, 03:20 PM
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Join Date: Nov 2009
Location: Sacramento, CA
Posts: 92
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I hate when they have to change the numbers...
Most likely it's due to either pranksters digging up the runway and rotating it slightly. Either that or the airport management decided to realign to prevailing winds that have changed due to global warming... 
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12-11-2012, 03:59 PM
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Join Date: Jun 2005
Posts: 846
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#
I think its caused from the huge dam China built it filled up 10 years ago now China is in a drought and its tilting back as second thought your airport should get a sign like gas station were it can be changed from FBO. Best of luck to you if were still here after the 21st.
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12-11-2012, 04:44 PM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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Do you have any certifiable nerds in the area? Back in the day, I know of "some" nerd types that collected military surplus magnetrons and pried the huge magnets apart to create a local "disturbance in the force". This magnetic variation was detectable for several blocks.
Another thought...do you spray with heavy metal compounds in the ag business? 
__________________
Noel
RV-6A N6NF
tip-up
flying
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12-11-2012, 05:38 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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Sorry Pierre , I was testing my tesla coil again. I'll leave it off for now
Bird
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Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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12-11-2012, 05:56 PM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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Hay bird...when we tested in the proximity of an active Tesla coil, we could not detect or confirm a magnetic field disturbance using a cheapie 'ol pocket compass. But then with the magnetrons at the other end of the lab, we could have perminately altered the field of the compass.
__________________
Noel
RV-6A N6NF
tip-up
flying
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12-11-2012, 07:32 PM
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Join Date: Jul 2007
Location: Madison, Wisconsin
Posts: 778
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Check this out for calculation of historic magnetic declination (based on the National Geophysical Data Center's model for the magnetic field):
http://www.ngdc.noaa.gov/geomagmodel.../historicPoint
For Louisville GA it show magnetic declination changing continuously in one direction since 1970, from 1?7" W to 5?57" W. There doesn't appear to be a physical reason why the Pierre's runway orientation should have changed first in one direction and then the other, so apparently "government bureaucracy" may be the correct answer?
__________________
Alan Carroll
RV-8 N12AC
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12-12-2012, 06:52 AM
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Join Date: May 2007
Location: Quincy, Florida
Posts: 680
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Pierre
Why is Pierre's runway the only one changing? It seems to me that all runway headings would change that are included in the "wandering boundaries" of longitude that the magnetic pole moves in. I don't know all I understand about this.......................
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