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Oldsfolks(at)aol.com
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 Posted: Sun Aug 26, 2007 6:11 pm Post subject: Another remote compass solution |
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I found the best solution to the compass problem was my GPS ?? Imagine that !!!
Bob Olds
Get a sneak peek of the all-new AOL.com.
[quote][b]
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n5lp(at)warpdriveonline.c
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| Posted: Sun Aug 26, 2007 6:59 pm Post subject: Another remote compass solution |
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Some GPSs have an internal compass, but no aircraft unit I know of.
Otherwise, the problem is that the GPS does not give heading, which
is what is used in aviation with ATC.
Larry Pardue
Carlsbad, NM
On Aug 26, 2007, at 8:10 PM, Oldsfolks(at)aol.com wrote:
| Quote: | I found the best solution to the compass problem was my GPS ??
Imagine that !!!
Bob Olds
www.matronics.com/Navigator?RV-List _-
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Mon Aug 27, 2007 3:40 am Post subject: Another remote compass solution |
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All of you right. A few notes
The electric Ritchie boat compass is not made any more, so
if you get one its old new stock. You may find them hard to
get now. I was going to use one and bought it. I decided to
get a Dynon EFIS, which as a mag compass, so I did not
use it.
GPS has made the compass obsolete?
True ATC wants us to fly heading, usually, but if VFR with a
GPS "Track" is way better any day. If you have TRACK why
in the world would you care or need mag heading? (smile
laugh). Seriously you are not dead reckoning with a GPS on
board. I look at the compass rarely, may be to double check
the EFIS. On the Boeing B737 there is a wet compass,
folded up and out of view most of the time.
For Day VFR experimental, a "whisky" or "jelly jar"
compass of ANY KIND is needed for day VFR!
Reference the link below. (periheliondesign.com has all kind
of cool electrical stuff for RV builders.)
http://www.periheliondesign.com/downloads/MINIMUM%20INSTRUMENT%20AND%20EQUIPMENT%20REQUIREMENTS.pdf
No compass is needed at all in an experimental for day
VFR (see above). Think about how much you really ever
used a wet compass in the past. In the past we used it to set
the vacuum powered DG. I fly a no electric J-3
sometimes and dead reckon. Yes it has a use but with GPS,
not much. However the advice below is probably good advice:
"GPS should be used in conjunction with dead reckoning,
not to replace it. Electronics are man-made and subject to
failure without warning." (no argument)
As a CFI and instrument instructor in the past I taught all
kinds of compass trivia and lead/lag-dip, but really it's not
practical for much. If the GPS goes out a heading would be
nice of course, but I hate instruments that lie. I almost rather
no compass than one that's useless, assuming you are VFR
and have GPS of some kind.
Cheers George
[quote][b]
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yenduc(at)sbcglobal.net
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| Posted: Mon Aug 27, 2007 8:53 am Post subject: Another remote compass solution |
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I was going through the same ruminations a week or so ago as to wether or not a Dynon D 100 would classify as a "magnetic compass". It does have a magnetrometer , but requires power for it to work --- and I do have a back up battery in the D 100 which is supposed to work for about 1 1/2 hours after power failure. As opinions were split as to wether this would suffice, I decided to use a Pegasus whiskey compass from S.I.R.S. which I got from AC Spruce for $200. The compass is TSOD as a backup AC compass. So far I am impressed with how compact, light, and durable it seems to be. Luckily I found a spot for it in the panel where it is unaffected by any stray magnetic fields. I now have five devices in the aircraft which will give me heading information not including VOR --- seems like overkill particularly when I'll probably use the 396 in the gismo mount most of the time.
The gist of the opinions I got from folks who have gone through the process was that it all depends on the DAR that you get as to wether or not you need a non powered, whiskey type compass. I decided not to tempt fate and got the Pegasus. It doesn't weigh much more than the metal in hole I cut out of the panel for it.
good luck
dave
On Aug 27, 2007, at 4:39 AM, <gmcjetpilot(at)yahoo.com (gmcjetpilot(at)yahoo.com)> wrote: | Quote: | All of you right. A few notes
The electric Ritchie boat compass is not made any more, so
if you get one its old new stock. You may find them hard to
get now. I was going to use one and bought it. I decided to
get a Dynon EFIS, which as a mag compass, so I did not
use it.
GPS has made the compass obsolete?
True ATC wants us to fly heading, usually, but if VFR with a
GPS "Track" is way better any day. If you have TRACK why
in the world would you care or need mag heading? (smile
laugh). Seriously you are not dead reckoning with a GPS on
board. I look at the compass rarely, may be to double check
the EFIS. On the Boeing B737 there is a wet compass,
folded up and out of view most of the time.
For Day VFR experimental, a "whisky" or "jelly jar"
compass of ANY KIND is needed for day VFR!
Reference the link below. (periheliondesign.com has all kind
of cool electrical stuff for RV builders.)
http://www.periheliondesign.com/downloads/MINIMUM%20INSTRUMENT%20AND%20EQUIPMENT%20REQUIREMENTS.pdf
No compass is needed at all in an experimental for day
VFR (see above). Think about how much you really ever
used a wet compass in the past. In the past we used it to set
the vacuum powered DG. I fly a no electric J-3
sometimes and dead reckon. Yes it has a use but with GPS,
not much. However the advice below is probably good advice:
"GPS should be used in conjunction with dead reckoning,
not to replace it. Electronics are man-made and subject to
failure without warning." (no argument)
As a CFI and instrument instructor in the past I taught all
kinds of compass trivia and lead/lag-dip, but really it's not
practical for much. If the GPS goes out a heading would be
nice of course, but I hate instruments that lie. I almost rather
no compass than one that's useless, assuming you are VFR
and have GPS of some kind.
Cheers George
| Quote: |
href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com
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[quote][b]
| | - The Matronics RV-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:
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sbuc(at)hiwaay.net
Guest
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| Posted: Mon Aug 27, 2007 3:30 pm Post subject: Another remote compass solution |
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Just for the sake of the DAR I splurged on a suction cup compass from
Walmart, less than $5 as I recall. The compass was tossed into the
flight bag once he left the airport. He did say I would need a
correction card...... 
Sam Buchanan
RV-6 Classic, 812 hrs
====================================
Dave Cudney wrote:
| Quote: | I was going through the same ruminations a week or so ago as to wether
or not a Dynon D 100 would classify as a "magnetic compass". It does
have a magnetrometer , but requires power for it to work --- and I do
have a back up battery in the D 100 which is supposed to work for about
1 1/2 hours after power failure. As opinions were split as to wether
this would suffice, I decided to use a Pegasus whiskey compass from
S.I.R.S. which I got from AC Spruce for $200. The compass is TSOD as a
backup AC compass. So far I am impressed with how compact, light, and
durable it seems to be. Luckily I found a spot for it in the panel
where it is unaffected by any stray magnetic fields. I now have five
devices in the aircraft which will give me heading information not
including VOR --- seems like overkill particularly when I'll probably
use the 396 in the gismo mount most of the time.
The gist of the opinions I got from folks who have gone through the
process was that it all depends on the DAR that you get as to wether or
not you need a non powered, whiskey type compass. I decided not to
tempt fate and got the Pegasus. It doesn't weigh much more than the
metal in hole I cut out of the panel for it.
good luck
dave
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http://www.matronics.com/Navigator?RV-List |
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