Today's Message Index:
----------------------
1. 04:20 AM - Re: Shimmy vibration? (Richard Romaine)
2. 10:59 AM - Re: Yak-List Digest: 4 Msgs - 05/02/20 (jay wells)
3. 10:59 AM - Re: Yak-List Digest: 4 Msgs - 05/02/20 (jay wells)
Message 1
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| Subject: | Re: Shimmy vibration? |
...also check NW side/side uneven tire wear and sufficient (33 psi) inflation.
Both will make shimmy damper work harder. Low inflation will induce wear on
outer tread, significant uneven wear there will make it more likely to shimmy
off-balance. If you have any yaw on touchdown, the bounce may still have the
NW displaced on second touchdown getting more of the uneven wear.
Cheers, Rich
Sent from my iPhone
Message 2
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| Subject: | Re: Yak-List Digest: 4 Msgs - 05/02/20 |
Larry: I had a shimmy problem in my CJ that bugged me for quite some time.
I had the CJ for almost 10 years before it cropped up. It started out as a
n occasional nuisance and one day it shook bad and did break the splined sh
aft. OH dampener but still a transient nuisance problem on takeoff and unde
r braking. Over a period of time changed nose tire, balanced nose wheel, ch
anged nose tire again and reversed direction of wheel - that finally fixed
it. I believe my root cause was the tendency of the Desser tires to go out
of round if left to sit for an extended time particularly if the tire becom
es oil contaminated and/or low on pressure. I am more careful caring for my
nose tire tire now. BTW there was no doubt the shaft broke the day it let
go. Doug has the parts, I did source thin stainless washers elsewhere to sh
im scissors per PLA MM. Hope this helps.
Jay Wells1985 CJ6A=C2-
On Sunday, May 3, 2020, 05:19:39 AM EDT, Yak-List Digest Server <yak-li
st@matronics.com> wrote:
*
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=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
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Messages Posted Sat 05/02/20: 4
=C2- =C2- =C2- =C2- =C2- ----------------------------------------
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Today's Message Index:
----------------------
=C2- =C2- 1. 05:50 AM - Shimmy vibration?=C2- (motoadve)
=C2- =C2- 2. 07:36 AM - Re: Shimmy vibration?=C2- (Larry Pine)
=C2- =C2- 3. 10:55 AM - Re: Shimmy vibration?=C2- (doug sapp)
=C2- =C2- 4. 03:40 PM - Re: Shimmy vibration?=C2- (motoadve)
________________________________=C2- Message 1=C2- ____________________
_________________
Time: 05:50:16 AM PST US
Subject: Yak-List: Shimmy vibration?
From: "motoadve" <larry@motoadventuring.com>
It had happened twice, once landing on grass strip that transitions to pave
ment,
the nose wheel got back in the air a bit and when it touched down, got lots
of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down
before
I should , had too much energy) when it touched down again lots of vibratio
n,
whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be t
he nose
wheel does not likes to come back up in the air because the second time it
touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing ) :)
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
________________________________=C2- Message 2=C2- ____________________
_________________
Time: 07:36:04 AM PST US
From: Larry Pine <threein60@yahoo.com>
Subject: Re: Yak-List: Shimmy vibration?
Service shimmy dampener=C2-
Sent from Yahoo Mail for iPhone
On Saturday, May 2, 2020, 05:59, motoadve <larry@motoadventuring.com> wrote
:
It had happened twice, once landing on grass strip that transitions to pave
ment, the nose wheel got back in the air a bit and when it touched down, go
t lots of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down
before I should , had too much energy) when it touched down again lots of
vibration, whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be t
he nose wheel does not likes to come back up in the air because the second
time it touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing ) :)
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
________________________________=C2- Message 3=C2- ____________________
_________________
Time: 10:55:27 AM PST US
From: doug sapp <dougsappllc@gmail.com>
Subject: Re: Yak-List: Shimmy vibration?
Could be several things:
Linkage worn
Scissors worn
Splined shaft (in damper) sheared
Damper needs overhauled
My guess is that the splined shaft is sheared.=C2- I have o/h kits and ne
w
splined shafts if you discover you need them.
Best,
Doug
On Sat, May 2, 2020 at 5:53 AM motoadve <larry@motoadventuring.com> wrote:
>
> It had happened twice, once landing on grass strip that transitions to
> pavement, the nose wheel got back in the air a bit and when it touched
> down, got lots of vibration, whole plane shaking.
>
> Second time I did a landing and bounced, (short field and wanted to be
> down before I should , had too much energy) when it touched down again lo
ts
> of vibration, whole plane shaking.
> Both times I thought I had a flat tire.
>
> Take offs , no vibration , and regular landings no vibration, seems to be
> the nose wheel does not likes to come back up in the air because the seco
nd
> time it touches down generates a lot of vibration.
>
> Any ideas what causes this (apart from lousy landing ) :)
>
> --------
> www.Backcountry182.com
> Cessna 182 P
> CJ -6
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496160#496160
>
>
________________________________=C2- Message 4=C2- ____________________
_________________
Time: 03:40:07 PM PST US
Subject: Yak-List: Re: Shimmy vibration?
From: "motoadve" <larry@motoadventuring.com>
Thanks Doug, good to hear from you, will keep you posted.
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496166#496166
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: Yak-List Digest: 4 Msgs - 05/02/20 |
Larry: I had a shimmy problem in my CJ that bugged me for quite some time.
I had the CJ for almost 10 years before it cropped up. It started out as a
n occasional nuisance and one day it shook bad and did break the splined sh
aft. OH dampener but still a transient nuisance problem on takeoff and unde
r braking. Over a period of time changed nose tire, balanced nose wheel, ch
anged nose tire again and reversed direction of wheel - that finally fixed
it. I believe my root cause was the tendency of the Desser tires to go out
of round if left to sit for an extended time particularly if the tire becom
es oil contaminated and/or low on pressure. I am more careful caring for my
nose tire tire now. BTW there was no doubt the shaft broke the day it let
go. Doug has the parts, I did source thin stainless washers elsewhere to sh
im scissors per PLA MM. Hope this helps.
Jay Wells1985 CJ6A=C2-
On Sunday, May 3, 2020, 05:19:39 AM EDT, Yak-List Digest Server <yak-li
st@matronics.com> wrote:
*
========================
=C2- Online Versions of Today's List Digest Archive
========================
Today's complete Yak-List Digest can also be found in either of the
two Web Links listed below.=C2- The .html file includes the Digest format
ted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation.=C2- The .txt file includes the plain ASCII versio
n
of the Yak-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
=C2- =C2- http://www.matronics.com/digest/digestview.php?Style=82701&
View=html&Chapter 20-05-02&Archive=Yak
Text Version:
=C2- =C2- http://www.matronics.com/digest/digestview.php?Style=82701&
View=txt&Chapter 20-05-02&Archive=Yak
========================
=======================
=C2- EMail Version of Today's List Digest Archive
========================
=======================
=C2- =C2- =C2- =C2- =C2- ----------------------------------------
------------------
=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2- =C2- Yak-List Digest Archive
=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- ---
=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- Total
Messages Posted Sat 05/02/20: 4
=C2- =C2- =C2- =C2- =C2- ----------------------------------------
------------------
Today's Message Index:
----------------------
=C2- =C2- 1. 05:50 AM - Shimmy vibration?=C2- (motoadve)
=C2- =C2- 2. 07:36 AM - Re: Shimmy vibration?=C2- (Larry Pine)
=C2- =C2- 3. 10:55 AM - Re: Shimmy vibration?=C2- (doug sapp)
=C2- =C2- 4. 03:40 PM - Re: Shimmy vibration?=C2- (motoadve)
________________________________=C2- Message 1=C2- ____________________
_________________
Time: 05:50:16 AM PST US
Subject: Yak-List: Shimmy vibration?
From: "motoadve" <larry@motoadventuring.com>
It had happened twice, once landing on grass strip that transitions to pave
ment,
the nose wheel got back in the air a bit and when it touched down, got lots
of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down
before
I should , had too much energy) when it touched down again lots of vibratio
n,
whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be t
he nose
wheel does not likes to come back up in the air because the second time it
touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing ) :)
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
________________________________=C2- Message 2=C2- ____________________
_________________
Time: 07:36:04 AM PST US
From: Larry Pine <threein60@yahoo.com>
Subject: Re: Yak-List: Shimmy vibration?
Service shimmy dampener=C2-
Sent from Yahoo Mail for iPhone
On Saturday, May 2, 2020, 05:59, motoadve <larry@motoadventuring.com> wrote
:
It had happened twice, once landing on grass strip that transitions to pave
ment, the nose wheel got back in the air a bit and when it touched down, go
t lots of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down
before I should , had too much energy) when it touched down again lots of
vibration, whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be t
he nose wheel does not likes to come back up in the air because the second
time it touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing ) :)
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
________________________________=C2- Message 3=C2- ____________________
_________________
Time: 10:55:27 AM PST US
From: doug sapp <dougsappllc@gmail.com>
Subject: Re: Yak-List: Shimmy vibration?
Could be several things:
Linkage worn
Scissors worn
Splined shaft (in damper) sheared
Damper needs overhauled
My guess is that the splined shaft is sheared.=C2- I have o/h kits and ne
w
splined shafts if you discover you need them.
Best,
Doug
On Sat, May 2, 2020 at 5:53 AM motoadve <larry@motoadventuring.com> wrote:
>
> It had happened twice, once landing on grass strip that transitions to
> pavement, the nose wheel got back in the air a bit and when it touched
> down, got lots of vibration, whole plane shaking.
>
> Second time I did a landing and bounced, (short field and wanted to be
> down before I should , had too much energy) when it touched down again lo
ts
> of vibration, whole plane shaking.
> Both times I thought I had a flat tire.
>
> Take offs , no vibration , and regular landings no vibration, seems to be
> the nose wheel does not likes to come back up in the air because the seco
nd
> time it touches down generates a lot of vibration.
>
> Any ideas what causes this (apart from lousy landing ) :)
>
> --------
> www.Backcountry182.com
> Cessna 182 P
> CJ -6
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496160#496160
>
>
________________________________=C2- Message 4=C2- ____________________
_________________
Time: 03:40:07 PM PST US
Subject: Yak-List: Re: Shimmy vibration?
From: "motoadve" <larry@motoadventuring.com>
Thanks Doug, good to hear from you, will keep you posted.
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496166#496166
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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