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beachyjeff(at)juno.com
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 Posted: Sun Apr 22, 2007 9:29 am Post subject: Compass Errors |
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I am working on my panel and find that my vertical card compass, which
will be mounted on top of the glare shield on my CH701, is very
inaccurate when placed there. Outside the plane it is okay. I understand
from the archives that I will need to degauss my cabin. My question is,
which instruments will be affected by the degaussing such that I should
remove them from the panel prior to degaussing? I presume that the air
powered flight instruments would be okay to leave in place but to remove
all the engine gauges, radio and transponder? Any help on this question
and on the process of degaussing by those who have done this would be
greatly appreciated.
Jeff Beachy
CH701, 90%
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tonyplane(at)bellsouth.ne
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| Posted: Sun Apr 22, 2007 10:08 am Post subject: Compass Errors |
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Jeff
I had the same problem with my vertical card compass. I placed two small bar magnets (removed from my GPS antenna) one each side of the compass. Seems to have worked. If I recall, this was recommended by the compass install info. I also seem to recall that the Zenith demo I flew for a demo ride about 3 1/2 years ago, had a panel mounted "regular" compass with some gross errors.
(Does anyone use a mag compass anymore, considering the easy use of GPS for mag course?)
Tony Graziano
601XL/Jab3300; N493TG; 234 hrs.
Compass Errors From: Jeffrey A Beachy (beachyjeff(at)juno.com ([email]beachyjeff(at)juno.com?subject=Re:%20Compass%20Errors&replyto=20070422.132707.2184.23.beachyjeff(at)juno.com[/email])) Date: [b]Sun Apr 22 - 10:29 AM[/b] | Quote: | | Quote: | I am working on my panel and find that my vertical card compass, which
will be mounted on top of the glare shield on my CH701, is very
inaccurate when placed there. Outside the plane it is okay. I understand
from the archives that I will need to degauss my cabin. My question is,
which instruments will be affected by the degaussing such that I should
remove them from the panel prior to degaussing? I presume that the air
powered flight instruments would be okay to leave in place but to remove
all the engine gauges, radio and transponder? Any help on this question
and on the process of degaussing by those who have done this would be
greatly appreciated.
Jeff Beachy
CH701, 90%
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[quote][b]
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dredmoody(at)cox.net
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| Posted: Sun Apr 22, 2007 1:54 pm Post subject: Compass Errors |
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I will have a wiskey compass as a backup for the glass panel and gps. Like all insurance policies, I hope I don't get to use it but it will be there. I bought one of those Navigator compasses out of AS. This one has a mount that can be glued to the inside of the canopy bubble. I'm hoping that locating it that far from the electonics and power wires in the panel will allow it to operate accurately. If you can wait a few months for an answer........
Dred
[quote] ---
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sun Apr 22, 2007 3:02 pm Post subject: Compass Errors |
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I had a vertical card compass installed in my Zodiac. I tried it in
the panel and on the glare shield, It read accurately East or West
but there was no way it would zero in North or South. A few months
ago, I bought a $10 Airguide compass from Walmart for my Jeep. I was
able to calibrate it very well in the Jeep. Then I decided, what the
hell, I'll try it in the Zodiac. I stuck it to the canopy with the
suction cups and took the plane out to see if I could get it to
calibrate. Well what do you know, it works great. It even has
aircraft style markings. The $10 Walmart compass has now permanently
replaced the $250 aircraft compass in my Zodiac.
On Apr 22, 2007, at 2:05 PM, T. Graziano wrote:
| Quote: |
Jeff
I had the same problem with my vertical card compass. I placed two
small bar magnets (removed from my GPS antenna) one each side of
the compass. Seems to have worked. If I recall, this was
recommended by the compass install info. I also seem to recall
that the Zenith demo I flew for a demo ride about 3 1/2 years ago,
had a panel mounted "regular" compass with some gross errors.
(Does anyone use a mag compass anymore, considering the easy use of
GPS for mag course?)
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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jfosse1(at)shawneelink.ne
Guest
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| Posted: Mon Apr 23, 2007 7:18 pm Post subject: Compass Errors |
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I had the same problem mounting the vertical card compass on the glare
shield. I removed it from the glare shield and moved it around in the cabin
to see if there was a location where it would not be affected by magnetism.
Strangely enough when I moved it upwards to the horizontal member of the
cabin it seemed to work perfectly. So, I mounted it there and was able to
calibrate it. I can't account for the way it worked. I had mounted the
magnetic shield I bought with the compass so that should have taken care of
the instruments. Whatever the cause, it works super good mounted on the
horizontal and it is relatively easy to see, although not as easy as on the
glare shield. Jim Fosse, N 329F.
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billmileski
Joined: 07 Aug 2006
Posts: 68
Location: Ledyard, CT
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| Posted: Wed Apr 25, 2007 6:05 am Post subject: Re: Compass Errors |
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I have a cheap non-TSO'd old-style compass on the top of my panel (screwed onto the top of the glare shield). When installed, it read 15 to 30 degrees off in all quadrants, and worse, the error varied +/- 5 degrees depending on the fore-aft position of the control stick. I flew 50 or so hours without doing anything about it and ignoring it, assuming it was an ornament. Then I planned for my first significant cross country (up into New Hampshire and VT from CT in the winter) and decided I needed a backup plan in case the GPS I was way too addicted to had a problem. Long story short -- I swung the compass while parked on an airport compass rose, and held the stick at cruise position (top surface of elevator horizontal) during each adjustment. The compass is only meaningful in unaccelerated flight anyway. Turned out to be accurate to within a degree or so, and I have practiced navigating by it, with surprisingly good results. I think AC43-13-1B recommended running the engine while adjusting, and I did notice the compass drift a couple degrees after starting the engine at the compass rose. So give it a shot before assuming like I did that it's too bogus an installation to get usable results.
Bill Mileski
701 912S 89 hours
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