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Nanchang Magnetic Heading Sensor GHC-2

 
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PS



Joined: 08 Sep 2006
Posts: 84
Location: Texas

PostPosted: Mon Jun 11, 2018 6:37 pm    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

I am looking for information for the compass on my CJ. Why does it have a clear window by the vertical stabilizer? The paint shop did not cover my compass window and I am curious what effect that would have.

Phil
N71HS


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wlannon(at)shaw.ca
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PostPosted: Mon Jun 11, 2018 8:32 pm    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Hi Phil;

None!

On the CJ the heading sensor is actually a "master" magnetic compass. It is
calibrated (swung) in the same manner as any other magnetic compass but
whether the window is painted or not you probably could not see through it
in any case. If you want to swing it you would remove the access panel.

I made the cardinal sin some time back by assuming on this list that the Yak
52, etc. had the same antiquated system. Big mistake, they are much more
modern.

Walt

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PS



Joined: 08 Sep 2006
Posts: 84
Location: Texas

PostPosted: Mon Jun 11, 2018 8:48 pm    Post subject: Re: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Hello Walt,

Thanks for responding. I am curious why the sensor has a window. As of tonight, my sensor has a clear view thru new plexi.

Phil


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wlannon(at)shaw.ca
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PostPosted: Tue Jun 12, 2018 10:15 am    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Hey Phil;

That’s to look through and read your heading while calibrating the compass
system. Though in fact the access panel would be removed in that case
taking the window with it.

Walt

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mark.bitterlich(at)navy.m
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PostPosted: Tue Jun 12, 2018 2:30 pm    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Walt, is that "Master Magnetic Compass" actually a Flux Valve? Just curious.

Mark
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PostPosted: Tue Jun 12, 2018 7:25 pm    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Hi Mark;

To be honest I have no idea what a flux valve is. Whatever this is it no
doubt has a similar function.
It is a very large (about 8" dia.) horizontal (just like the standard floor
or shelf mounted WW2 era British aircraft compass though much larger)

It is complete with a very standard corrector magnet assy. A 6" (approx)
horizontal compass card with a viewing window and a shit load of coils,
wires, etc. and a large
Cannon plug that presumably transmits heading data to the cockpit
indicators.

Also holds about one quart of compass fluid (standard petroleum type- not
whisky).

Looks like a compass to me.

Cheers;
Walt

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PostPosted: Mon Jun 18, 2018 9:03 am    Post subject: Nanchang Magnetic Heading Sensor GHC-2 Reply with quote

Gotcha, sorry about the late reply.

Yes, no question ... if it has fluid in it, there is a freaking compass inside! Smile

A flux valve is a totally electronic array ... also with many coils, etc., also with correcting plates, but it has no moving parts. It senses the actual Earth magnetic field directly and from that derives magnetic heading. Usually there is also a Gyro involved that is in turn slaved to the flux valve.

Mark
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