Today's Message Index:
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1. 10:03 AM - Re: Nanchang Magnetic Heading Sensor GHC-2 (Bitterlich, Mark G CIV NAVAIR, WD)
2. 10:15 AM - Booster Coil needed please (Looigi)
3. 10:38 AM - Booster Coil needed please (Bitterlich, Mark G CIV NAVAIR, WD)
4. 07:57 PM - Re: Booster Coil needed please (Vic)
5. 10:35 PM - Engine running rough at high power settings? (apatton2)
Message 1
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| Subject: | Re: Nanchang Magnetic Heading Sensor GHC-2 |
Gotcha, sorry about the late reply.
Yes, no question ... if it has fluid in it, there is a freaking compass inside!
:-)
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
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon
Sent: Tuesday, June 12, 2018 11:25 PM
Subject: [Non-DoD Source] Re: Yak-List: Nanchang Magnetic Heading Sensor GHC-2
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
-----Original Message-----
From: Bitterlich, Mark G CIV NAVAIR, WD
Sent: Tuesday, June 12, 2018 3:26 PM
Subject: Re: Yak-List: Nanchang Magnetic Heading Sensor GHC-2
<mark.bitterlich@navy.mil>
Walt, is that "Master Magnetic Compass" actually a Flux Valve? Just
curious.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon
Sent: Tuesday, June 12, 2018 12:32 AM
Subject: [Non-DoD Source] Re: Yak-List: Nanchang Magnetic Heading Sensor
GHC-2
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
-----Original Message-----
From: PS
Sent: Monday, June 11, 2018 7:37 PM
Subject: Yak-List: Nanchang Magnetic Heading Sensor GHC-2
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
--------
Phil
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http://forums.matronics.com/viewtopic.php?p=480804#480804
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Message 2
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| Subject: | Booster Coil needed please |
Hi All,
Does anyone have a KP-4716 or DH-2 Booster (shower of sparks) coil they wish to
part with please? Doug is out of stock.
The one in our Yak-52 has died after only 35 hours in use.
Many thanks
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480965#480965
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| Subject: | Booster Coil needed please |
You might consider removing it from the aircraft and testing it on the bench.
It's hard to grasp why it would fail in 35 hours. Although it is easy to imagine
that power to the unit, or a bad wire to the mag could happen. These puppy
dogs are also adjustable for the gap in the points inside.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Looigi
Sent: Monday, June 18, 2018 1:15 PM
Subject: [Non-DoD Source] Yak-List: Booster Coil needed please
Hi All,
Does anyone have a KP-4716 or DH-2 Booster (shower of sparks) coil they wish to
part with please? Doug is out of stock.
The one in our Yak-52 has died after only 35 hours in use.
Many thanks
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480965#480965
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| Subject: | Re: Booster Coil needed please |
Well, it is just another ignition coil, so it is mortal - remember coil troubles
on M 14s ??
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480978#480978
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| Subject: | Engine running rough at high power settings? |
O Gods of M14:
Here's a riddle for you.
I have a Yak-50 with a stock M14P. I have been flying it regularly since I purchased
it around 8mo and 40hr ago. It is a very stock airplane (no digital engine
monitor, etc). TTA&E 640h.
Before I flew it for the first time, I replaced the following with new/overhauled
components:
- spark plugs (auto kit)
- Mags (overhauled M9F)
- Carb (overhauled)
So, now all of those components have around 40hrs on them.
2 weekends ago I had the engine run very rough on climbout. I continued around
the pattern and landed. Mag check was nominal (as it was prior to takeoff). Tried
again and felt enough engine vibe on takeoff roll to abort. Mag check again
nominal.
Brought it back to hangar. Uncowled; visually inspected. Found some cracked ignition
lead boots (4 of the 9 on the rear cylinders). So I replaced all ignition
leads with new ones (auto harnesses).
Tried it again today. Same issue on takeoff. Feels like it's missing significant
power / climbing more slowly. This time pulled throttle and prop back to 70%
rpm upon reaching 500' (airport is sea level). It smoothed out *very* quickly
with the throttle and prop pulled back (especially when i brought prop lever
back under 80%). On the ground it again mag checked nominal (both 80%). Don't
know what to make of this.
Any thoughts on where to go next? I haven't pulled the plugs yet but may do that
next - or check carb settings.
Thanks!
Andrew
--------
Andrew Patton
Yak-50
San Francisco, CA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480979#480979
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