Today's Message Index:
----------------------
1. 01:01 AM - Re: Re: Nose leg - NANCHANG - Shimmy issue (William Geipel)
2. 03:32 AM - Re: W100Plus and Camguard in the M14P (Craig Payne)
3. 04:30 AM - Re: Re: W100Plus and Camguard in the M14P (Richard Goode)
4. 03:22 PM - Re: Nose leg - NANCHANG - Shimmy issue (Greg Wrobel)
5. 03:39 PM - Re: W100Plus and Camguard in the M14P (Ttail)
6. 07:09 PM - uAvionix skyBeacon/skySensor wiring (ed.kettler)
7. 08:04 PM - Re: Electrical question (ed.kettler)
Message 1
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| Subject: | Re: Nose leg - NANCHANG - Shimmy issue |
Preload the bearings a little bit..
> On May 15, 2019, at 02:49, stephen.hayne <stephen.hayne@gmail.com> wrote:
>
>
> I completely agree with Walt (out of balance tires), and have been pursuing shimmy
for over a year. I still get a little "bzzzttt" when touchdown at ~70knots,
so I keep the nose off until 60'ish.
>
> I've statically balanced (no joy), dynamically balanced at a motorcycle shop
(much better), rebuilt the shimmy dampener complete with dunking under 5606 to
remove all bubbles, rebushed torque links, rebushed strut with new seals, checked
all pressures on all struts (went to max pressure on main struts to stop
duckwalk when carrying, ummm, heavier instructors) and tires, dynamically balanced
mains and set toe, new bearings and races. Whew. Everything feels incredibly
solid. But...
>
> So, still hunting. Here's a few pics - the one with the cordless drill is a
joke pic! Used a Bridgeport knee mill and CNC lathe for all work.
>
> https://drive.google.com/drive/folders/1XZZezfVFTB5tDHF4xm8E7kHwu-jMVE5e?usp=sharing
>
> Stephen
>
> --------
> -
> Dr. Stephen C. Hayne, Professor, CIS, Colorado State University
> 666CJA
> http://selfsynchronize.com/hayne/plane/cj6.asp
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=489224#489224
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: W100Plus and Camguard in the M14P |
During a maintenance conference at AirVenture, some years back, a
presentation was made by a rep from a West Coast radial engine rebuilder.
The company has changed names and morphed a bit but I think there are still
two shops still in the business of overhauling big radials.
My main take-away was that the Silver plating on the master rod carried
most of the dynamic load and that layer was protected by a layer of Lead,
which also acted as a shock cushion. Leaching away the Lead layer exposed
the Silver which is an active metal, vulnerable to attack from Zinc
compounds. At some point, the Silver depletes and result is seizure. From
there the engine starts coming apart.
Standard practice in the OH process was to X-ray the master rod bearings,
even on WW-II overhauls fresh out of the can, as a means of checking the
integrity of that Silver layer. Some X-ray prints were shown as part of the
presentation.
What I heard was "Do not use oils that have compounds that scavenge Lead".
Our flat engine oils are designed to remove Lead left behind from the use
of Leaded fuels such as 100LL.
I stopped using any oils* not* designed for Radial Engines. Our Yak/CJ
engines master rod ends are manufactured in the same way as those big
radials.
Craig Payne
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Message 3
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| Subject: | Re: W100Plus and Camguard in the M14P |
Interesting. But, for the record, the master rod bushing on the M 14 P
engine is a copper base with lead on top =93 no silver. I am no
metallurgist, but I would slightly doubt whether oil additives would
attack solid lead metal.
Richard Goode
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
<mailto: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
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Craig Payne
Sent: 17 May 2019 11:32
Subject: Yak-List: Re: W100Plus and Camguard in the M14P
During a maintenance conference at AirVenture, some years back, a
presentation was made by a rep from a West Coast radial engine
rebuilder. The company has changed names and morphed a bit but I think
there are still two shops still in the business of overhauling big
radials.
My main take-away was that the Silver plating on the master rod carried
most of the dynamic load and that layer was protected by a layer of
Lead, which also acted as a shock cushion. Leaching away the Lead layer
exposed the Silver which is an active metal, vulnerable to attack from
Zinc compounds. At some point, the Silver depletes and result is
seizure. From there the engine starts coming apart.
Standard practice in the OH process was to X-ray the master rod
bearings, even on WW-II overhauls fresh out of the can, as a means of
checking the integrity of that Silver layer. Some X-ray prints were
shown as part of the presentation.
What I heard was "Do not use oils that have compounds that scavenge
Lead". Our flat engine oils are designed to remove Lead left behind from
the use of Leaded fuels such as 100LL.
I stopped using any oils not designed for Radial Engines. Our Yak/CJ
engines master rod ends are manufactured in the same way as those big
radials.
Craig Payne
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&
utm_campaign=sig-email&utm_content=webmail>
Virus-free.
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&
utm_campaign=sig-email&utm_content=webmail> www.avg.com
Message 4
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| Subject: | Re: Nose leg - NANCHANG - Shimmy issue |
I had issues of my aircraft pulling to right during taxi for 5 years.
Changled tires, pressures etc. Never could get it right. Changed complete
nose leg and my issues disappeared. With that said, I had also replaced
the upper brass bushings that are in the frame of the aircraft where the
upper fork of the gear attach prior to installing the new gear and even
then, it still pulled to right. My new gear fixed the right pull.
On Thu, May 2, 2019, 01:39 woodja51 <mwuillemin@mac.com> wrote:
>
> Hi all ... have just installed a completely new nose leg ( from China ) o
n
> my Chang
> . I have been having issues with nose wheel shimmy and figured changing
> the entire leg / shimmy damper might solve the problem. Tyre is new (
> didn=99t help original shimmy ) bearings appear to be ok - no slack
etc. all
> greased up etc but when taxi testing it seemed to pull to the right .
> Adjustment of the shimmy damper to pull it left seemed to help but I
> can=99t find any sort of centring cam adjustment etc for tracking ?
> Is there any ?
>
> The issue is that on a hi speed taxi when lifting the nose then putting i
t
> down again after rejecting the takeoff at around 60>knots , it shudders (
> shimmy?) quite badly - as if it=99s still offset slightly , maybe a
lmost
> skipping ? Any gurus out there able to enlighten me ? Matt Combat Flight
s
> Melbourne +61420347885 mwuillemin@mac.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=489048#489048
>
>
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>
>
Message 5
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| Subject: | Re: W100Plus and Camguard in the M14P |
What Oils do you use Yakman ?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489275#489275
Message 6
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| Subject: | uAvionix skyBeacon/skySensor wiring |
Has anyone run the separate wire for the strobes for the uAvionix wingtip setup?
I have the wingtip off, and see there is a tube for a single wingtip light wire
(power only, airframe ground). I suppose the next step is to remove the wing
join fairings, then splice the new wires to the old and pull them through. Don't
know about any connectors or other bits, so any advice and pictures would be
greatly appreciated
Many thanks!
Ed
--------
Ed Kettler
N53HM
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489277#489277
Message 7
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| Subject: | Re: Electrical question |
In the Downloads section on CJ6.com, there are two electrical system files, one
is a table, the other is a schematic. They are numbered pages 16 and 18. Based
on the table, it appears that the missing page 17 is also a schematic. Does
anybody have a page 17 they can share for the group?
Second question, is the main gyro switch sending out 28vdc to the inverter, or
is it the 400hz AC power?
Thanks
Ed
--------
Ed Kettler
N53HM
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=489278#489278
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