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1. 07:41 PM - Re: Re: Magnetic heading sensor (ZH-4) (Mark Bitterlich)
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| Subject: | Re: Magnetic heading sensor (ZH-4) |
As a comment only, I definitely understand that viewpoint Justin. A
slaved gyro stabilized compass system is a real work of art and I
maintained one myself on Grumman A-6 models for many years, which
included swinging the Flux Valve (No, not the =9CFlux
Capacitor=9D) which was a real major pain in the tail! In the
ICAP-III they finally did away with that piece of . That
system.. , and I danced in glee when magnetic heading was then
reverse engineered by embedded GPS/Inertial Nav Systems. I cannot
imagine trying to maintain that compass system without really complete
theory of operation manuals and a ton of spare parts. Best of luck, my
fix would be a pair of dikes, a whole bunch of removed weight, and
increased panel space. Just sayin.
Mark
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Justin Drafts
Sent: Wednesday, April 29, 2020 4:33 PM
Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
Nope, nothing wrong at all with the tried & true wet compass...
The ex-aero engineer (=perfectionist ) in me just likes to keep
existing systems on the plane in decent working order.
There are definitely much better ways to navigate, ie a variety of
affordable GPS's, but I'm a nostalgic purist...
Justin
On Wed, Apr 29, 2020, 11:32 AM Richard Goode
<richard.goode@russianaeros.com> wrote:
I apologise for asking what might seem to be a silly question, but is
there any reason not to navigate with a simple, traditional compass?
Why make life more complicated than is absolutely necessary?
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode@russianaeros.com
<http://www.russianaeros.com> www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server@matronics.com
<owner-yak-list-server@matronics.com> On Behalf Of Greg Wrobel
Sent: 29 April 2020 15:45
Subject: Re: Yak-List: Re: Magnetic heading sensor (ZH-4)
I have the exact same issue. Tried cleaning the plugs and not much help.
The other day it was back to normal for one flight and now 40-60 degrees
off again. Not that I use it much but I like everything working
correctly in my airplane. I will continue to explore the system and
share with you if I have a miraculous discovery.
Greg "Clouddog " Wrobel
On Wed, Apr 29, 2020, 00:42 Justin Drafts <draftsjust417@gmail.com>
wrote:
Excellent background & info, much appreciated Walt!
Not having looked at the GHC-2 in years, I presume there's a
straightforward way to check/service the fluid?
(Will also clean all the cannon plugs.) -Justin
On Wed, Apr 29, 2020 at 8:59 AM Walter Lannon <wlannon@shaw.ca> wrote:
Hi Justin;
The Gyro stabilized magnetic compass system in the CJ is a complex
=9Cgyrosyn=9D system most of which I am certainly not
qualified to give any guidance on with one possible exception.
The primary unit (GHC-2) unlike more modern systems is in fact a very
large and very accurate WET magnetic compass. It=99s output is
fed through the stabilizing gyro which corrects turning errors, etc.
before display on the cockpit indicator. It looks, not surprisingly,
like a WW2 era British unit. As such it does require some periodic
maintenance.
Your problem of course may be electrical in nature in, or between, any
one of the three units. But it could also be a purely magnetic compass
problem like loss of fluid or fluid contamination over the years. I
have known people to top-up or re-fill a compass with petroleum solvent
(Varsol, Stoddard, etc.) since it looks and smells like compass fluid.
It is also loaded with bacteria that over time can gum up a compass.
Compass fluid is basically kerosene, triple distilled to kill the bugs.
Don=99t use anything else.
Unlike your standby compass this one takes a lot of fluid!
Cheers;
Walt
From: Justin Drafts <mailto:draftsjust417@gmail.com>
Sent: Tuesday, April 28, 2020 2:38 PM
Subject: Yak-List: Re: Magnetic heading sensor (ZH-4)
Ok, in this season of electrical gremlins for me, I have a fresh
issue that's just come up...
My magnetic heading indicator (p/n ZH-4) in the fwd cockpit has always
read
flawlessly when compared w/ wet compass, and it's snapped to attention
when I depress the small "Synch" button above it. My mag heading sensor
unit (p/n GHC-2) is back in the empennage.
Lately it's been reading 30- 45 deg off from the wet compass.
Fixing a loose wire in the synch switch hasn't improved it's accuracy.
Otherwise I haven't touched anything.
Other ideas for adjusting or correcting the issue?
Are there adjustments on the sensor in the tail?
Inputs, experiences, and advice welcome!
Thanks-
Justin Drafts
N280NC
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