REFLECTOR: Shimmy

David Ullman ullman at robustdecisions.com
Thu Feb 19 17:47:39 CST 2009


I am glad I started this discussion as it has been enlightening.  I haven't
had time this week to do the technical reading that I promised, yet.
However, a couple of comments. 
 
1) I suspect that there is such inconsistency in people's results because
each airplane is bent differently.  If the nose strut is a few degrees out
of vertical as seen from the front, then this will exacerbate the shimmy.
2) I think the front wheel lock is a fix for the symptoms rather than the
cause and thus I probably wont put one my plane unless I get it bent and
nothing else works.
3) I believe that the wide foot print of the tire, does not help.

Finally, I used to design and manufacture recumbent bicycles (BikeE brand).
If you don't do the front end geometry right on a bicycle people have in the
past added springs or dampers. These were hacks at the symptoms rather than
the cause.  You can make any bike handle well or poorly with fairly small
changes.  I want to look into this further.

More after I read some technical papers to see what I can learn. 

David G. Ullman PhD ME
Robust Decisions
ullman at robustdecisions.com
541-754-3609

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Sent: Thursday, February 19, 2009 2:03 PM
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Subject: Reflector Digest, Vol 57, Issue 52

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Today's Topics:

   1. Re:  wheel shimmy (aminetech at bluefrog.com)
   2. Re:  wheel shimmy (aminetech at bluefrog.com)
   3. Re:  wheel shimmy (Al Gietzen)
   4. Re:  wheel shimmy (Scott Derrick)
   5. Re:  wheel shimmy (KMis178813 at aol.com)


----------------------------------------------------------------------

Message: 1
Date: Thu, 19 Feb 2009 12:36:18 -0800
From: <aminetech at bluefrog.com>
Subject: Re: REFLECTOR: wheel shimmy
To: Velocity <velocityxl at fastmail.fm>, "Velocity Aircraft Owners and
	Builders	list" <reflector at tvbf.org>
Message-ID: <20090219123618.8C265873 at resin13.mta.everyone.net>
Content-Type: text/plain; charset="UTF-8"



--- velocityxl at fastmail.fm wrote:



So what you are saying is the Sticktion is what we are fighting  right.
So if we over come this then we would not need toe Hydraulic dampener?

That will help.  However, the friction system produces constant force
independent of the pivoting speed, while the hydraulic dampener produces
higher force the faster the wheel is pivoting, which is what you want.  It
will pivot easier at slow speeds for turning and not pivot as easy at high
pivot speeds, such as during shimmying.

John
Ron


----- Original Message ----- 
From: "Scott Derrick" <scott at tnstaafl.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, February 19, 2009 12:32 PM
Subject: Re: REFLECTOR: wheel shimmy


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------------------------------

Message: 2
Date: Thu, 19 Feb 2009 12:38:05 -0800
From: <aminetech at bluefrog.com>
Subject: Re: REFLECTOR: wheel shimmy
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Message-ID: <20090219123805.8C265905 at resin13.mta.everyone.net>
Content-Type: text/plain; charset="UTF-8"

Thanks, Dave.  I have the spacer and will look into the thicker washers.

John

--- davedent at comcast.net wrote:

From: <davedent at comcast.net>
To: "Velocity" <velocityxl at fastmail.fm>,        "Velocity Aircraft Owners
and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: wheel shimmy
Date: Thu, 19 Feb 2009 09:48:02 -0800

Just a input here related to nose gear shimmy.  I have found that on a 
number of the nose gear struts that have come out of the factory the threads

on the end of the shaft are too long.  Or there are too many.  So make sure 
that none of the thread can get into the bushing area.  If they do the 
threads get transferred to the bushing and the bushing is no longer a pivot 
but a jack screw.  With weight on it, it can't pivot.  It can only go up or 
down.
Also if you have the lighter weight beveled washers they have a spacer 
inside of them to make up side clearance.  When they are compressed to the 
14+lbs you could be trying to compress the spacer and not the washers.  I 
found this out the hard way when every time I went to fly, I found the 
tension had loosened.  After I changed out to thicker washers the problem 
went away because the spacer was no longer needed.  So before further flight

make sure that the spacer is not being compressed, this is the piece of 
tubing between the ID of the washers and the strut.  With the lighter 
washers they can compress to a point that you are now bottoming the washers 
and now trying to compress the spacer.  Then the washers become useless.
Dave
N32XL
----- Original Message ----- 
From: "Velocity" <velocityxl at fastmail.fm>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, February 19, 2009 9:08 AM
Subject: Re: REFLECTOR: wheel shimmy


> :it's difficult to get the plane exactly straight with the runway
>
> So the dampener idea really would not solve this problem of steering 
> right?
> Sounds like steerable nose wheel is what is really needed. I remember some
> one had made a steerable nose wheel once using a servo motor.
> Any idea on how it worked out?
>
> Also there is the locking nose wheel which looks good . That way the 
> tension
> can be quite low making steering easier?
> Still have to stab the brakes to get it to turn though.
>
> Any one played with changing the caster amount?
>
> Ron
>
> ----- Original Message ----- 
> From: <aminetech at bluefrog.com>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Thursday, February 19, 2009 10:49 AM
> Subject: Re: REFLECTOR: wheel shimmy
>
>
>> Another issue with the tension at 14 lbs or so, is that it's difficult to
>> get the plane exactly straight with the runway and that results in the
>> need for braking during takeoff.  Not a good thing if takeoff distance is
>> critical.
>>
>> John
>>
>> --- scott at tnstaafl.net wrote:
>>
>> From: Scott Derrick <scott at tnstaafl.net>
>> To: Velocity <velocityxl at fastmail.fm>,        Velocity Aircraft Owners 
>> and
>> Builders list <reflector at tvbf.org>
>> Subject: Re: REFLECTOR: wheel shimmy
>> Date: Thu, 19 Feb 2009 09:30:19 -0700
>>
>> Ron,
>>
>> I have about 450 hours of flying on my V.  With the bellevue washer
>> system.
>>
>> It is adequate, but certainly not optimal.  The problems for me are,
>>
>> 1.)  Hard to turn. Specifically hard to break into a turn, once the
>> wheel breaks free it turns fairly easily, leading to the next problem.
>> The tighter you have teh bellevue washers the harder to initiate a turn.
>>
>> 2.) In tight situations, its easy to over turn so that the wheel is now
>> near 90 degrees and then its tough to get it to straighten out.
>> Sometimes I've had to get out and kick the nose tire straight before
>> continuing a taxi.
>>
>> 3.) Bellevue's continuing tendency to loosening up.  Even though I check
>> it before every flight I have had it loosen up to much and then get a
>> bit of shimmy on landing, not a good feeling, especially for passengers
>> who imagine the worst.  As some have mentioned,  how you land and how
>> much weight on the nose can influence if you get a shimmy or not.
>>
>> A system that did not require constant maintenance/attention and
>> provided easier turning would be a great addition.  The bellevues have
>> simplicity and proven performance on their side, which in airplanes is a
>> big big plus.
>>
>> Scott
>>
>> Velocity wrote:
>>> Now being on this list for over 10 years now I know this issue keeps
>>> coming
>>> up. It seems
>>> the answer usually goes to set the tension on the front wheel to 14 lbs
>>> of
>>> pull or something like that
>>> and you should not have a problem. Is this not true? I have heard that
>>> this
>>> should be
>>> on the preflight check list. Does this number change and really need to
>>> be
>>> adjusted regularly?
>>> If so maybe  we just need to find the way to get the tension to stay
>>> within
>>> a range that works.
>>> Or perhaps  there are people that feel that there is a better mouse trap
>>> out
>>> there and are working
>>> toward a simpler/ better design for the front wheel which is great. So 
>>> is
>>> there a steering Issue?
>>> Or is there a real problem that needs to be addressed? Just wondering
>>> because I have not
>>> had the joy yet of being in the front seat and seeing for my self. One 
>>> of
>>> these days, One of these
>>> days.
>>>
>>> Ron
>>>
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Sid Knox" <sbjknox at earthlink.net>
>>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>>> Sent: Wednesday, February 18, 2009 11:56 PM
>>> Subject: Re: REFLECTOR: wheel shimmy
>>>
>>>
>>>
>>>> From: "Scott Derrick" <scott at tnstaafl.net>
>>>>
>>>>> Sid,
>>>>> Can you give an update on the damper? Working well?
>>>>>
>>>> Working great.  Never a hint of shimmy.  The big nut is tight only
>>>> enough
>>>> to
>>>> take up any slack.  With damper disconnected, completely free of
>>>> friction.
>>>>
>>>>
>>>>> How many landings on the system?
>>>>>
>>>> Several dozen since install in Spring of 2006.
>>>>
>>>>
>>>>> Did you ever put external stops on it so the damper wouldn't bottom
>>>>> out?
>>>>>
>>>> No.  I can make the sharp 120 degree turn on the narrow taxiway leading
>>>> to
>>>> my ramp no problem.
>>>>
>>>>
>>>>> Ever miss not having a fulling castoring nose wheel?
>>>>> Scott
>>>>>
>>>> Not yet.  I simply pick up the nose and walk it around if needed.  With
>>>> no
>>>> passenger(s) inside of course... its too heavy for me otherwise.
>>>> Pushing
>>>> backwards is easier too without the tendency for the wheel to caster
>>>> around
>>>> backwards.
>>>>
>>>> Sid
>>>>
>>>> _______________________________________________
>>>> To change your email address, visit
>>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>>
>>>> Visit the gallery!  www.tvbf.org/gallery
>>>> user:pw = tvbf:jamaicangoose
>>>> Check new archives: www.tvbf.org/pipermail
>>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>>>
>>>>
>>>
>>> _______________________________________________
>>> To change your email address, visit
>>> http://www.tvbf.org/mailman/listinfo/reflector
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>>> user:pw = tvbf:jamaicangoose
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>>>
>>>
>>
>>
>>
>> _______________________________________________
>> To change your email address, visit
>> http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery!  www.tvbf.org/gallery
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>>
>> _______________________________________________
>> To change your email address, visit
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>>
>
> _______________________________________________
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------------------------------

Message: 3
Date: Thu, 19 Feb 2009 12:39:41 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: wheel shimmy
To: "'Velocity'" <velocityxl at fastmail.fm>,	"'Velocity Aircraft Owners
	and Builders list'" <reflector at tvbf.org>
Message-ID: <A9A1E685C6EB481B9A8E9CC82B545F5C at BigAl>
Content-Type: text/plain;	charset="us-ascii"

So what you are saying is the Sticktion is what we are fighting  right.
So if we over come this then we would not need toe Hydraulic dampener?

Ron

"Sticktion" is only part of the problem.  I find the sticktion force only
about 2-3 lbs more that the steady state.  What we want is a freely
castoring nose wheel that does not shimmy - or as close to that as possible.

Al




------------------------------

Message: 4
Date: Thu, 19 Feb 2009 14:55:50 -0700
From: Scott Derrick <scott at tnstaafl.net>
Subject: Re: REFLECTOR: wheel shimmy
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Message-ID: <499DD566.5010906 at tnstaafl.net>
Content-Type: text/plain; charset="iso-8859-1"

Al,

Thanks for straightening me out on that!  Not sure where Belleville got
turned into Bellevue? 

Scott

Al Gietzen wrote:
>
> Subject: Re: REFLECTOR: wheel shimmy
>
>  
>
> I'm sorry guys.  This is killing me.  I held off as long as I could.
>
>  
>
> They are Belleville washers. 
> http://en.wikipedia.org/wiki/Belleville_washer
>
>  
>
> Whew...
>
>  
>
> Thank you; Andy.
>
>  
>
> Although I thought Bellevue was sort of appropriate because there is a
> mental institution thereJ.
>
>  
>
> Al
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
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Message: 5
Date: Thu, 19 Feb 2009 16:57:10 EST
From: KMis178813 at aol.com
Subject: Re: REFLECTOR: wheel shimmy
To: reflector at tvbf.org
Message-ID: <cc7.4c770a07.36cf2fb6 at aol.com>
Content-Type: text/plain; charset="us-ascii"

After this last post (So many negative words) I  thought I might need to 
inform some as to the operation of the nose lock.  It was designed not as a
shimmy 
damper but to keep the wheel pant straight in  flight. A wheel pant, even at

a slight angle, will alter level flight  and cruise speeds. The side effect
of 
the lock, is that it stops the front  wheel/tire assembly from starting the 
oscillation that becomes the shimmy that  some of us know so well. The lock
is 
engaged when lined up with the  runway for take off. Steering is not a
problem 
on take off roll and does not  give you the over steer that you get with 
factory set up. The lock remains  engaged for entire flight including the
landing. 
The mains are supposed to touch  first on a landing and will straighten the 
plane before the nose ever  touches. (Anyone landing nose gear first will
have 
other problems  besides a shimmy). Disengage the lock when down to taxi
speeds 
and  turning becomes normal. Turning can be made easier by loosening the 
tension  nut, just Don't forget to engage lock for flight. CHECKLIST!
    The operation does require pilot to engage and disengage  at the proper 
times. Similar to putting the gear up or down. Failure to put  the gear down

usually ends up with a bad outcome. Failure to disengage the lock  should
not 
hurt anything. I have gone through several tests trying to break  these
parts. 
In the severest case the lock should break it's mounting  screws according
to 
computer generated stress analysis. If it's any  stronger it breaks the gear

leg-any weaker and it just keeps breaking  off.  It's a fine line for sure.
    Approximately 45 locks were sold, I don't know  how many are flying? 
There have been 2 failures both of which were failure to  disengage for
taxing 
which led to other issues after the initial problem.  Taking the pilot out
of the 
loop would require a automatic engagement and make  the system way 
complicated. The lock was only designed as a band aid for a  problem that
some of us 
already have. If anyone comes up with a better mouse  trap, I'm all for it. 
Weight and looks were also important to me in the  design.
   Some specs for anyone who cares. On a retract model, with the  lock 
disengaged, the nose gear is full castoring as it is now. On a fixed  gear,
the 
wheel pant limits the gear to 60 degrees in each direction (120  total). On
a SE, 
This angle will let you turn a 180 on a 17ft wide  taxiway. Turning that
hard 
pivots on the inside main tire without it  even turning.  
 
    Ken Mishler
    N2087M SUV FG 200hp 750hrs
    N173EX 173 SE RG 300hp 165hrs
    N872KM XLRG-5 Turbo 300hp Still Under Construction
 
    Things I don't do never seem to get done???   :)
 
 
 
 
 
In a message dated 2/19/2009 1:33:56 P.M. Eastern Standard Time,  
scott at tnstaafl.net writes:

The  point about the bellevue washer system and difficulty in keeping  it
straight on the runway is that the bellevue system requires a  higher
brake pressure to get the washer to release than to turn the wheel  after
it has released, since your standing hard on the brake to correct a  few
degrees, once it releases it over steers in the direction you want  to
go, then you have to brake in the opposite direction to correct for  the
over steer and so the zigzag ride down the runway begins!

If the  anti-shimmy device does not have such a high breakout force you
could  gently tap the brake and steer straight down the runway with
ease.   Well, relative ease!

A hydraulic damper like Cessna airplanes use, also  like Sid installed on
his V,  does not have this high break out  force.  The force is the same
to pivot the wheel from a stop as it  does after it has started moving. 

So the Cessna style damper does  solve a lot of the problems associated
with the bellevue system.

I  agree its not as positive as a steerable nose wheel.  

I  personally don't like the locking nose wheel.  I think its a  system
that inherently sets you up for an incident as scary or damaging  than
the problem it is supposed to cure.  Kinduv like  prescription
medications!  Forget to unlock it before landing and you  could have an
experience much more memorable than a nose wheel shimmy.  

Scott

Velocity wrote:
> :it's difficult to get the plane  exactly straight with the runway
>
> So the dampener idea really  would not solve this problem of steering  
right?
> Sounds like  steerable nose wheel is what is really needed. I remember
some 
> one  had made a steerable nose wheel once using a servo motor.
> Any idea on  how it worked out?
>
> Also there is the locking nose wheel which  looks good . That way the 
tension 
> can be quite low making steering  easier?
> Still have to stab the brakes to get it to turn  though.
>
> Any one played with changing the caster  amount?
>
> Ron
>
> ----- Original Message -----  
> From: <aminetech at bluefrog.com>
> To: "Velocity Aircraft  Owners and Builders list" <reflector at tvbf.org>
> Sent: Thursday,  February 19, 2009 10:49 AM
> Subject: Re: REFLECTOR: wheel  shimmy
>
>
>   
>> Another issue with the  tension at 14 lbs or so, is that it's difficult
to 
>> get the plane  exactly straight with the runway and that results in the 
>> need for  braking during takeoff.  Not a good thing if takeoff distance
is 
 
>> critical.
>>
>> John
>>
>>  --- scott at tnstaafl.net wrote:
>>
>> From: Scott Derrick  <scott at tnstaafl.net>
>> To: Velocity  <velocityxl at fastmail.fm>,        Velocity Aircraft  Owners 
and 
>> Builders list <reflector at tvbf.org>
>>  Subject: Re: REFLECTOR: wheel shimmy
>> Date: Thu, 19 Feb 2009  09:30:19 -0700
>>
>> Ron,
>>
>> I have  about 450 hours of flying on my V.  With the bellevue washer 
>>  system.
>>
>> It is adequate, but certainly not  optimal.  The problems for me are,
>>
>> 1.)  Hard  to turn. Specifically hard to break into a turn, once the
>> wheel  breaks free it turns fairly easily, leading to the next problem.
>>  The tighter you have teh bellevue washers the harder to initiate a
turn.
>>
>> 2.) In tight situations, its easy to over turn  so that the wheel is now
>> near 90 degrees and then its tough to get  it to straighten out.
>> Sometimes I've had to get out and kick the  nose tire straight before
>> continuing a  taxi.
>>
>> 3.) Bellevue's continuing tendency to loosening  up.  Even though I check
>> it before every flight I have had it  loosen up to much and then get a
>> bit of shimmy on landing, not a  good feeling, especially for passengers
>> who imagine the  worst.  As some have mentioned,  how you land and how
>>  much weight on the nose can influence if you get a shimmy or  not.
>>
>> A system that did not require constant  maintenance/attention and
>> provided easier turning would be a great  addition.  The bellevues have
>> simplicity and proven  performance on their side, which in airplanes is a
>> big big  plus.
>>
>> Scott
>>
>> Velocity  wrote:
>>     
>>> Now being on this list  for over 10 years now I know this issue keeps 
>>>  coming
>>> up. It seems
>>> the answer usually goes to  set the tension on the front wheel to 14 lbs

>>>  of
>>> pull or something like that
>>> and you should  not have a problem. Is this not true? I have heard that 
>>>  this
>>> should be
>>> on the preflight check list.  Does this number change and really need to

>>> be
>>>  adjusted regularly?
>>> If so maybe  we just need to find the  way to get the tension to stay 
>>> within
>>> a range  that works.
>>> Or perhaps  there are people that feel that  there is a better mouse
trap 
>>> out
>>> there and  are working
>>> toward a simpler/ better design for the front  wheel which is great. So
is
>>> there a steering  Issue?
>>> Or is there a real problem that needs to be addressed?  Just wondering
>>> because I have not
>>> had the joy  yet of being in the front seat and seeing for my self. One
of
>>>  these days, One of these
>>> days.
>>>
>>>  Ron
>>>
>>>
>>>
>>>
>>>
>>>  ----- Original Message ----- 
>>> From: "Sid Knox"  <sbjknox at earthlink.net>
>>> To: "Velocity Aircraft Owners  and Builders list" <reflector at tvbf.org>
>>> Sent: Wednesday,  February 18, 2009 11:56 PM
>>> Subject: Re: REFLECTOR: wheel  shimmy
>>>
>>>
>>>
>>>   
>>>> From: "Scott Derrick"  <scott at tnstaafl.net>
>>>>
>>>>   
>>>>>  Sid,
>>>>> Can you give an update on the damper? Working  well?
>>>>>
>>>>>       
>>>> Working great.  Never a hint of  shimmy.  The big nut is tight only 
>>>>  enough
>>>> to
>>>> take up any slack.   With damper disconnected, completely free of 
>>>>  friction.
>>>>
>>>>
>>>>   
>>>>> How many landings on the  system?
>>>>>
>>>>>       
>>>> Several dozen since install in Spring  of 2006.
>>>>
>>>>
>>>>   
>>>>> Did you ever put external  stops on it so the damper wouldn't bottom 
>>>>>  out?
>>>>>
>>>>>       
>>>> No.  I can make the sharp 120  degree turn on the narrow taxiway
leading 
>>>>  to
>>>> my ramp no  problem.
>>>>
>>>>
>>>>   
>>>>> Ever miss not having a  fulling castoring nose wheel?
>>>>>  Scott
>>>>>
>>>>>       
>>>> Not yet.  I simply pick up the  nose and walk it around if needed.
With 
>>>>  no
>>>> passenger(s) inside of course... its too heavy for me  otherwise. 
>>>> Pushing
>>>> backwards is  easier too without the tendency for the wheel to caster
>>>>  around
>>>> backwards.
>>>>
>>>>  Sid
>>>>
>>>>  _______________________________________________
>>>> To change  your email address, visit
>>>>  http://www.tvbf.org/mailman/listinfo/reflector
>>>>
>>>>  Visit the gallery!  www.tvbf.org/gallery
>>>> user:pw =  tvbf:jamaicangoose
>>>> Check new archives:  www.tvbf.org/pipermail
>>>> Check old archives:
http://www.tvbf.org/archives/velocity/maillist.html
>>>>
>>>>
>>>>   
>>>  _______________________________________________
>>> To change your  email address, visit 
>>>  http://www.tvbf.org/mailman/listinfo/reflector
>>>
>>>  Visit the gallery!  www.tvbf.org/gallery
>>> user:pw =  tvbf:jamaicangoose
>>> Check new archives:  www.tvbf.org/pipermail
>>> Check old archives:  http://www.tvbf.org/archives/velocity/maillist.html
>>>
>>>
>>>   
>>
>>  _______________________________________________
>> To change your  email address, visit 
>>  http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit  the gallery!  www.tvbf.org/gallery
>> user:pw =  tvbf:jamaicangoose
>> Check new archives:  www.tvbf.org/pipermail
>> Check old archives:  http://www.tvbf.org/archives/velocity/maillist.html
>>
>>  _______________________________________________
>> To change your  email address, visit 
>>  http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit  the gallery!  www.tvbf.org/gallery
>> user:pw =  tvbf:jamaicangoose
>> Check new archives:  www.tvbf.org/pipermail
>> Check old archives:  http://www.tvbf.org/archives/velocity/maillist.html
>>
>>   
>
>  _______________________________________________
> To change your email  address, visit 
http://www.tvbf.org/mailman/listinfo/reflector
>
>  Visit the gallery!  www.tvbf.org/gallery
> user:pw =  tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
>  Check old archives:  http://www.tvbf.org/archives/velocity/maillist.html
>
>    


_______________________________________________
To change your  email address, visit  
http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!   www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives:  www.tvbf.org/pipermail
Check old archives:  http://www.tvbf.org/archives/velocity/maillist.html

**************Need a job? Find an employment agency near you. 
(http://yellowpages.aol.com/search?query=employment_agencies&ncid=emlcntusye
lp00000003)
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Visit the gallery!  tvbf:jamaicangoose

End of Reflector Digest, Vol 57, Issue 52
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