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No takers?

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tdawson-townsend(at)auror
Guest

Posted: Wed Mar 26, 2008 5:53 am Post subject: No takers?

No nibbles on this question from the other day?  

   

For the folks who are flying:  

   

   

How about an update on the nose gear axle spacers?  Are installations  

with the "new" aluminum spacers working well as designed, or are  

supplemental measures to ensure the spacers can't rotate still  

warranted?  

   

   

Inquiring minds want to know . . .  

   

   

TDT  

   

   

Tim Dawson-Townsend  

Aurora Flight Sciences  

tdt(at)aurora.aero (tdt(at)aurora.aero)   

617-500-4812 (office)  

617-905-4800 (mobile)  

   

      [quote][b]

orchidman

Joined: 10 Jul 2006
Posts: 277
Location: Oklahoma City - KRCE

Posted: Wed Mar 26, 2008 5:58 am Post subject: Re: No takers?

 	  tdawson-townsend(at)auror wrote: 	
		  No nibbles on this question from the other day? 	


They must all be snowed in and can't get the hanger doors open

_________________
Gary Blankenbiller
RV10 - # 40674
(N2GB Flying)

flysrv10(at)gmail.com
Guest

Posted: Wed Mar 26, 2008 6:17 am Post subject: No takers?

Tim,  I got the updated spacer and still had shimmy problems.  I filed a flat spot on the axel and installed two set screws on the spacers.  This helped a lot but I still experience shimmy.  I learned on this site to push the stick forward to stop the shimmy and it works for the most part.  You still go through some shimmy before you stop it.



My nose wheel is nice a tight without any slop.  I cannot figure out why I still experience some shimmy.  I have done (at least I think) everything that has been published.  The set screws did make a remarkable difference.

Rob.



On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote: 	  Quote: 	
		  No nibbles on this question from the other day?

 

For the folks who are flying:

 

 

How about an update on the nose gear axle spacers?  Are installations

with the "new" aluminum spacers working well as designed, or are

supplemental measures to ensure the spacers can't rotate still

warranted?

 

 

Inquiring minds want to know . . .

 

 

TDT

 

 

Tim Dawson-Townsend

Aurora Flight Sciences

tdt(at)aurora.aero (tdt(at)aurora.aero)

617-500-4812 (office)

617-905-4800 (mobile)

 



 	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-List

blue; text-decoration: underline; ">http://forums.matronics.com

style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution



	


	


 [quote][b]

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Wed Mar 26, 2008 6:17 am Post subject: No takers?

I know I've seen people with the new ones that the aluminum

formed a taper in that bearing inner race.  Given the

idea that it can loosen up, I'd think the safe thing to

do is to prevent the rotation altogether as a preeptive

step so you don't have a problem.



Tim Olson - RV-10 N104CD - Flying

do not archive

Dawson-Townsend,Timothy wrote:

 	  Quote: 	
		   No nibbles on this question from the other day?

 

 

 

 *For the folks who are flying:*

 

 * *

 

 * *

 

 *How about an update on the nose gear axle spacers?  Are

 installations*

 

 *with the "new" aluminum spacers working well as designed, or are*

 

 *supplemental measures to ensure the spacers can't rotate still*

 

 *warranted?*

 

 * *

 

 * *

 

 *Inquiring minds want to know . . .*

 

 * *

 

 * *

 

 *TDT*

jesse(at)saintaviation.co
Guest

Posted: Wed Mar 26, 2008 6:17 am Post subject: No takers?

OK, I'll bite.  In the retrofits I have done I have had to shorten the axle a little bit on the lathe to make it a tight fit so the spacers don't spin.  I think on the new setups the length of the whole system is better, but I don't know for sure.



do not archive



 Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com (jesse(at)saintaviation.com)

Cell: 352-427-0285

Fax: 815-377-3694



 



On Mar 26, 2008, at 8:50 AM, Dawson-Townsend,Timothy wrote: 	  Quote: 	
		  No nibbles on this question from the other day?

 

For the folks who are flying:

 

 

How about an update on the nose gear axle spacers?  Are installations

with the "new" aluminum spacers working well as designed, or are

supplemental measures to ensure the spacers can't rotate still

warranted?

 

 

Inquiring minds want to know . . .

 

 

TDT

 

 

Tim Dawson-Townsend

Aurora Flight Sciences

tdt(at)aurora.aero (tdt(at)aurora.aero)

617-500-4812 (office)

617-905-4800 (mobile)

 



 	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-List

blue; text-decoration: underline; ">http://forums.matronics.com

style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution



	


	


 [quote][b]

pitts_pilot(at)bellsouth.
Guest

Posted: Wed Mar 26, 2008 7:06 am Post subject: No takers?

The axle rotation won't have anything to do with shimmy, defined as the shopping cart wobble back and forth.  Fix that by tightening the  nut on the nose gear tube.  A 25-30 pound pull on the wheel axle (off the ground of course) should make the nose gear shimmy free.

 

 As for wheel hop ..... an up and down vibration ..... tire balance or an out-of-round tire will cause that.  Bearing preload is a contributing factor ..... less than one rotation of the tire when spun by hand should be good.

 

 Now, a caveat here .... my info comes from adjusting my AA-1B which has a similar  castering nosegear.  Should work for an RV-10.

 Linn

 

 Rob Kermanj wrote:

 [quote]Tim,  I got the updated spacer and still had shimmy problems.  I filed a flat spot on the axel and installed two set screws on the spacers.  This helped a lot but I still experience shimmy.  I learned on this site to push the stick forward to stop the shimmy and it works for the most part.  You still go through some shimmy before you stop it.   

   

   My nose wheel is nice a tight without any slop.  I cannot figure out why I still experience some shimmy.  I have done (at least I think) everything that has been published.  The set screws did make a remarkable difference.

   

   

   Rob.

   

   On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote:    	  Quote: 	
		                 No nibbles on this question from the other day?

      

     For the folks who are flying:

      

      

     How about an update on the nose gear axle spacers?  Are installations

     with the "new" aluminum spacers working well as designed, or are

     supplemental measures to ensure the spacers can't rotate still

     warranted?

      

      

     Inquiring minds want to know . . .

      

      

     TDT

      

      

     Tim Dawson-Townsend

     Aurora Flight Sciences

     tdt(at)aurora.aero (tdt(at)aurora.aero)

     617-500-4812 (office)

     617-905-4800 (mobile)

      

     

      	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-List blue; text-decoration: underline; ">http://forums.matronics.com style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution  	
     

        

	
 [b]

robin1(at)mrmoisture.com
Guest

Posted: Wed Mar 26, 2008 7:43 am Post subject: No takers?

Rob,  

                I don’t think pushing forward on the stick is the proper way to resolve the shimmy. It may help but my guess is that that is a mask for the real issues. In all my RV flying experience on never wants to add more weight / forces to the nose wheel. In my 6A we keep the wheel off the ground as long as we have authority and then the stick is back in my lap the entire time I taxi. Same is true when I took a demo ride with Mike Seager in the factory 10. He starts the 10 with the stick full back and does not release it till Run Up. Same with his taxi back.  Now the A model Vans are known for their less than Cessna like gear durability but properly flown there should never see a problem. Adding greater forces by pushing the stick forward is not a solution to the shimmy.  

   

Good luck,  

Robin  

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of linn Walters

 Sent: Wednesday, March 26, 2008 9:03 AM

 To: rv10-list(at)matronics.com

 Subject: Re: No takers?  

  

  

   

The axle rotation won't have anything to do with shimmy, defined as the shopping cart wobble back and forth.  Fix that by tightening the  nut on the nose gear tube.  A 25-30 pound pull on the wheel axle (off the ground of course) should make the nose gear shimmy free.

 

 As for wheel hop ..... an up and down vibration ..... tire balance or an out-of-round tire will cause that.  Bearing preload is a contributing factor ..... less than one rotation of the tire when spun by hand should be good.

 

 Now, a caveat here .... my info comes from adjusting my AA-1B which has a similar  castering nosegear.  Should work for an RV-10.

 Linn

 

 Rob Kermanj wrote:

 

   

Tim,  I got the updated spacer and still had shimmy problems.  I filed a flat spot on the axel and installed two set screws on the spacers.  This helped a lot but I still experience shimmy.  I learned on this site to push the stick forward to stop the shimmy and it works for the most part.  You still go through some shimmy before you stop it.     

   

    

My nose wheel is nice a tight without any slop.  I cannot figure out why I still experience some shimmy.  I have done (at least I think) everything that has been published.  The set screws did make a remarkable difference.  

    

   

    

Rob.  

    

     

On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote:

 

         

No nibbles on this question from the other day?  

    

   

    

For the folks who are flying:  

    

   

    

   

    

How about an update on the nose gear axle spacers?  Are installations  

    

with the "new" aluminum spacers working well as designed, or are  

    

supplemental measures to ensure the spacers can't rotate still  

    

warranted?  

    

   

    

   

    

Inquiring minds want to know . . .  

    

   

    

   

    

TDT  

    

   

    

   

    

Tim Dawson-Townsend  

    

Aurora Flight Sciences  

    

tdt(at)aurora.aero (tdt(at)aurora.aero)  

    

617-500-4812 (office)  

    

617-905-4800 (mobile)  

    

   

  

   	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-Listblue; text-decoration: underline; ">http://forums.matronics.comstyle="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution 	


  

   

  

   

   	  Quote: 	
		     	
  

    	  Quote: 	
		    	
http://www.matronic           - MATRONICS available via the Web href="http://forums.matronics.com">http://forums.matronics.com===================[/b]http://www.matronics.com/c=[/b] [b]

flysrv10(at)gmail.com
Guest

Posted: Wed Mar 26, 2008 8:07 am Post subject: No takers?

I agree Robin but I am at the end of my rope.  If I relax or take the weight off the nose wheel, the shimmy get more aggravated.



Rob.



On Mar 26, 2008, at 11:38 AM, Robin Marks wrote: 	  Quote: 	
		  Rob,

                I don’t think pushing forward on the stick is the proper way to resolve the shimmy. It may help but my guess is that that is a mask for the real issues. In all my RV flying experience on never wants to add more weight / forces to the nose wheel. In my 6A we keep the wheel off the ground as long as we have authority and then the stick is back in my lap the entire time I taxi. Same is true when I took a demo ride with Mike Seager in the factory 10. He starts the 10 with the stick full back and does not release it till Run Up. Same with his taxi back.  Now the A model Vans are known for their less than Cessna like gear durability but properly flown there should never see a problem. Adding greater forces by pushing the stick forward is not a solution to the shimmy.

 

Good luck,

Robin

 

From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of linn Walters

Sent: Wednesday, March 26, 2008 9:03 AM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: Re: No takers?

 

The axle rotation won't have anything to do with shimmy, defined as the shopping cart wobble back and forth.  Fix that by tightening the  nut on the nose gear tube.  A 25-30 pound pull on the wheel axle (off the ground of course) should make the nose gear shimmy free.



As for wheel hop ..... an up and down vibration ..... tire balance or an out-of-round tire will cause that.  Bearing preload is a contributing factor ..... less than one rotation of the tire when spun by hand should be good.



Now, a caveat here .... my info comes from adjusting my AA-1B which has a similar  castering nosegear.  Should work for an RV-10.

Linn



Rob Kermanj wrote:

Tim,  I got the updated spacer and still had shimmy problems.  I filed a flat spot on the axel and installed two set screws on the spacers.  This helped a lot but I still experience shimmy.  I learned on this site to push the stick forward to stop the shimmy and it works for the most part.  You still go through some shimmy before you stop it.

 



My nose wheel is nice a tight without any slop.  I cannot figure out why I still experience some shimmy.  I have done (at least I think) everything that has been published.  The set screws did make a remarkable difference.



 



Rob.



 

On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote:

No nibbles on this question from the other day?



 



For the folks who are flying:



 



 



How about an update on the nose gear axle spacers?  Are installations



with the "new" aluminum spacers working well as designed, or are



supplemental measures to ensure the spacers can't rotate still



warranted?



 



 



Inquiring minds want to know . . .



 



 



TDT



 



 



Tim Dawson-Townsend



Aurora Flight Sciences



tdt(at)aurora.aero (tdt(at)aurora.aero)



617-500-4812 (office)



617-905-4800 (mobile)



 

 	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-Listblue; text-decoration: underline; ">http://forums.matronics.comstyle="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution 	


 



 



 	  Quote: 	
		     	
 

 	  Quote: 	
		    	
http://www.matronic           - MATRONICS available via the Web href="http://forums.matronics.com">http://forums.matronics.com===================http://www.matronics.com/c= 	  Quote: 	
		   	


[/url] 	  Quote: 	
		  blue; text-decoration: underline; ">[url=http://forums.matronics.com]http://forums.matronics.com 	
0

	


 [quote][b]

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Wed Mar 26, 2008 8:27 am Post subject: No takers?

Sorry Rob....I have bought a tire balancer that I've been intending

to use and do a write up on, but I'm just apologizing for it taking

me months over the winter.   I'll let you know if it helps a lot.

I'll possibly replace my tires this spring too...now that I've hit

325 hours.  I got better ones this time than the standard ones.

Wish I could try Scott's fancy goodyears though.   My guess is

that tire roundness and balance could be affecting you if it's

that bad....or at least that your side to side axle yoke preload

is too loose, or your axle bolt is too loose.   My only shimmy

seems to happen between 35 and 40kts.  Except I do think I get

some main gear shimmy that I'm hoping can be taken care of by the

balance and tires.  This spring I'll report back.  Nothing I

have right now though is severe or overly concerning.



Tim Olson - RV-10 N104CD - Flying

do not archive

Rob Kermanj wrote:

 	  Quote: 	
		   I agree Robin but I am at the end of my rope.  If I relax or take the 

 weight off the nose wheel, the shimmy get more aggravated.

 

 Rob.

 

 On Mar 26, 2008, at 11:38 AM, Robin Marks wrote:

> Rob,

>                 I don’t think pushing forward on the stick is the 

> proper way to resolve the shimmy. It may help but my guess is that 

> that is a mask for the real issues. In all my RV flying experience on 

> never wants to add more weight / forces to the nose wheel. In my 6A we 

> keep the wheel off the ground as long as we have authority and then 

> the stick is back in my lap the entire time I taxi. Same is true when 

> I took a demo ride with Mike Seager in the factory 10. He starts the 

> 10 with the stick full back and does not release it till Run Up. Same 

> with his taxi back.  Now the A model Vans are known for their less 

> than Cessna like gear durability but properly flown there should never 

> see a problem. Adding greater forces by pushing the stick forward is 

> not a solution to the shimmy.

>  

> Good luck,

> Robin

>  

> *From:* owner-rv10-list-server(at)matronics.com 

> <mailto:owner-rv10-list-server(at)matronics.com> [mailto:owner-rv10-list-server(at)matronics.com] *On 

> Behalf Of *linn Walters

> *Sent:* Wednesday, March 26, 2008 9:03 AM

> *To:* rv10-list(at)matronics.com <mailto:rv10-list(at)matronics.com>

> *Subject:* Re: No takers?

>  

> The axle rotation won't have anything to do with shimmy, defined as 

> the shopping cart wobble back and forth.  Fix that by tightening the  

> nut on the nose gear tube.  A 25-30 pound pull on the wheel axle (off 

> the ground of course) should make the nose gear shimmy free.

>

> As for wheel hop ..... an up and down vibration ..... tire balance or 

> an out-of-round tire will cause that.  Bearing preload is a 

> contributing factor ..... less than one rotation of the tire when spun 

> by hand should be good.

>

> Now, a caveat here .... my info comes from adjusting my AA-1B which 

> has a similar  castering nosegear.  Should work for an RV-10.

> Linn

>

> Rob Kermanj wrote:

>

> Tim,  I got the updated spacer and still had shimmy problems.  I filed 

> a flat spot on the axel and installed two set screws on the spacers. 

>  This helped a lot but I still experience shimmy.  I learned on this 

> site to push the stick forward to stop the shimmy and it works for the 

> most part.  You still go through some shimmy before you stop it.

>  

> My nose wheel is nice a tight without any slop.  I cannot figure out 

> why I still experience some shimmy.  I have done (at least I think) 

> everything that has been published.  The set screws did make a 

> remarkable difference.

>  

> Rob.

>  

> On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote:

>

> No nibbles on this question from the other day?

>  

> *For the folks who are flying:*

> * *

> * *

> *How about an update on the nose gear axle spacers?  Are installations*

> *with the "new" aluminum spacers working well as designed, or are*

> *supplemental measures to ensure the spacers can't rotate still*

> *warranted?*

> * *

> * *

> *Inquiring minds want to know . . .*

> * *

> * *

> *TDT*

>  

>  

> Tim Dawson-Townsend

> Aurora Flight Sciences

> tdt(at)aurora.aero <mailto:tdt(at)aurora.aero>

> 617-500-4812 (office)

> 617-905-4800 (mobile)

>  

> *http://www.matronics.com/Navigator?RV10-List*

> *blue; text-decoration: underline; ">http://forums.matronics.com*

> *style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution*

> * *

>  

>  

> * *

> * *

> * *

>  

> * *

> * *

> http://www.matronic           - MATRONICS available via the Web 

> href="http://forums.matronics.com">http://forums.matronics.com===================http://www.matronics.com/c=

> * *

>  <http://www.matronics.com/contribution>

> <http://www.matronics.com/contribution>

> ** <http://www.matronics.com/contribution>*http://www.matronics.com/Navigator?RV10-List

> blue; text-decoration: underline; ">http://forums.matronics.com

> style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution

>

> *

>

 

 *

 

 

 *

n212pj(at)gmail.com
Guest

Posted: Wed Mar 26, 2008 8:31 am Post subject: No takers?

It's almost as if you have a harmonic going on, onset  perhaps by an out of round tire?  Which I'm sure you've already  checked.  Too light a tire?  If everything else is as it should be,  I'd be looking for something inherent in the wheel or tire.  Does it shimmy  with pants on and off?  Just fishing here.  



 [quote]         From: owner-rv10-list-server(at)matronics.com    [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Rob    Kermanj

Sent: Wednesday, March 26, 2008 9:04 AM

To:    rv10-list(at)matronics.com

Subject: Re: No    takers?

   

I agree Robin but I am at the end of my rope.  If I relax or    take the weight off the nose wheel, the shimmy get more aggravated.   



   Rob.

   

   On Mar 26, 2008, at 11:38 AM, Robin Marks wrote:    	  Quote: 	
		                 Rob,

                          I don’t think pushing forward on the stick is the proper way to resolve the      shimmy. It may help but my guess is that that is a mask for the real issues.      In all my RV flying experience on never wants to add more weight / forces to      the nose wheel. In my 6A we keep the wheel off the ground as long as we have      authority and then the stick is back in my lap the entire time I taxi. Same      is true when I took a demo ride with Mike Seager in the factory 10. He      starts the 10 with the stick full back and does not release it till Run Up.      Same with his taxi back.  Now the A model Vans are known for their less      than Cessna like gear durability but properly flown there should never see a      problem. Adding greater forces by pushing the stick forward is not a      solution to the shimmy.

     

     Good      luck,

     Robin

     

               From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of linn      Walters

Sent: Wednesday, March 26, 2008 9:03      AM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: Re: No      takers?

     

     The      axle rotation won't have anything to do with shimmy, defined as the shopping      cart wobble back and forth.  Fix that by tightening the  nut on      the nose gear tube.  A 25-30 pound pull on the wheel axle (off the      ground of course) should make the nose gear shimmy free.



As for wheel      hop ..... an up and down vibration ..... tire balance or an out-of-round      tire will cause that.  Bearing preload is a contributing factor ....      less than one rotation of the tire when spun by hand should be      good.



Now, a caveat here .... my info comes from adjusting my AA-1B      which has a similar  castering nosegear.  Should work for an      RV-10.

Linn



Rob Kermanj wrote:

     Tim,       I got the updated spacer and still had shimmy problems.  I filed      a flat spot on the axel and installed two set screws on the spacers.       This helped a lot but I still experience shimmy.  I learned on      this site to push the stick forward to stop the shimmy and it works for the      most part.  You still go through some shimmy before you stop      it.

          



          My      nose wheel is nice a tight without any slop.  I cannot figure out why I      still experience some shimmy.  I have done (at least I think)      everything that has been published.  The set screws did make a      remarkable difference.



          



          Rob.



          

          On      Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy      wrote:

                    No nibbles on this      question from the other day?



          



          For the folks who are      flying:



          



          



          How about an update on      the nose gear axle spacers?  Are installations



          with the "new" aluminum      spacers working well as designed, or are



          supplemental measures to      ensure the spacers can't rotate still



          warranted?



          



          



          Inquiring minds want to      know . . .



          



          



          TDT



          



          



          Tim      Dawson-Townsend



          Aurora Flight      Sciences



          tdt(at)aurora.aero (tdt(at)aurora.aero)



          617-500-4812      (office)



          617-905-4800      (mobile)



          

 	  Quote: 	
		  http://www.matronics.com/Navigator?RV10-Listblue; text-decoration: underline; ">http://forums.matronics.comstyle="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution 	


     



     



 	  Quote: 	
		     	
     

 	  Quote: 	
		    	
http://www.matronic                - MATRONICS available via the Web href="http://forums.matronics.com">http://forums.matronics.com===================http://www.matronics.com/c= 	  Quote: 	
		   	


[/url] 	  Quote: 	
		  blue; text-decoration: underline; ">[url=http://forums.matronics.com]http://forums.matronics.com 	
0

blue; text-decoration: underline; ">http://forums.matronics.com 	
1[b]

flysrv10(at)gmail.com
Guest

Posted: Wed Mar 26, 2008 8:49 am Post subject: No takers?

Thanks again.  It is incredible how much experience and tips people provide on this list!



I had not looked into the tire or the wheel pants.  I will do both soon.

Rob.

On Mar 26, 2008, at 12:27 PM, John Jessen wrote: 	  Quote: 	
		    It's almost as if you have a harmonic going on, onset perhaps by an out of round tire?  Which I'm sure you've already checked.  Too light a tire?  If everything else is as it should be, I'd be looking for something inherent in the wheel or tire.  Does it shimmy with pants on and off?  Just fishing here.  



  	  Quote: 	
		        From: owner-rv10-list-server(at)matronics.com   [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Rob   Kermanj

Sent: Wednesday, March 26, 2008 9:04 AM

To:   rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: Re: No   takers?

  

I agree Robin but I am at the end of my rope.  If I relax or   take the weight off the nose wheel, the shimmy get more aggravated.  



  Rob.

  

  On Mar 26, 2008, at 11:38 AM, Robin Marks wrote:   	  Quote: 	
		              Rob,

                        I don’t think pushing forward on the stick is the proper way to resolve the     shimmy. It may help but my guess is that that is a mask for the real issues.     In all my RV flying experience on never wants to add more weight / forces to     the nose wheel. In my 6A we keep the wheel off the ground as long as we have     authority and then the stick is back in my lap the entire time I taxi. Same     is true when I took a demo ride with Mike Seager in the factory 10. He     starts the 10 with the stick full back and does not release it till Run Up.     Same with his taxi back.  Now the A model Vans are known for their less     than Cessna like gear durability but properly flown there should never see a     problem. Adding greater forces by pushing the stick forward is not a     solution to the shimmy.

    

    Good     luck,

    Robin

    

            From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of linn     Walters

Sent: Wednesday, March 26, 2008 9:03     AM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: Re: No     takers?

    

    The     axle rotation won't have anything to do with shimmy, defined as the shopping     cart wobble back and forth.  Fix that by tightening the  nut on     the nose gear tube.  A 25-30 pound pull on the wheel axle (off the     ground of course) should make the nose gear shimmy free.



As for wheel     hop ..... an up and down vibration ..... tire balance or an out-of-round     tire will cause that.  Bearing preload is a contributing factor .....     less than one rotation of the tire when spun by hand should be     good.



Now, a caveat here .... my info comes from adjusting my AA-1B     which has a similar  castering nosegear.  Should work for an     RV-10.

Linn



Rob Kermanj wrote:

    Tim,      I got the updated spacer and still had shimmy problems.  I filed     a flat spot on the axel and installed two set screws on the spacers.      This helped a lot but I still experience shimmy.  I learned on     this site to push the stick forward to stop the shimmy and it works for the     most part.  You still go through some shimmy before you stop     it.

        



        My     nose wheel is nice a tight without any slop.  I cannot figure out why I     still experience some shimmy.  I have done (at least I think)     everything that has been published.  The set screws did make a     remarkable difference.



        



        Rob.



        

        On     Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy     wrote:

                No nibbles on this     question from the other day?



        



        For the folks who are     flying:



        



        



        How about an update on     the nose gear axle spacers?  Are installations



        with the "new" aluminum     spacers working well as designed, or are



        supplemental measures to     ensure the spacers can't rotate still



        warranted?



        



        



        Inquiring minds want to     know . . .



        



        



        TDT



        



        



        Tim     Dawson-Townsend



        Aurora Flight     Sciences



        tdt(at)aurora.aero (tdt(at)aurora.aero)



        617-500-4812     (office)



        617-905-4800     (mobile)



        

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		  http://www.matronics.com/Navigator?RV10-Listblue; text-decoration: underline; ">http://forums.matronics.comstyle="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution 	


    



    



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 [quote][b]

flysrv10(at)gmail.com
Guest

Posted: Wed Mar 26, 2008 8:53 am Post subject: No takers?

My situation seems to be exactly like yours:  low speed, not severe  

and manageable.   I had someone on the ground check the vibration and  

they told me that it is definitely from the nose wheel.



I also have really nice lateral fit on the axel and nothing is loose  

at all.  If you do your balancing and get good results, let me know.



What kind of balancer do you have?

Rob.



On Mar 26, 2008, at 12:23 PM, Tim Olson wrote:



 	  Quote: 	
		   



 Sorry Rob....I have bought a tire balancer that I've been intending

 to use and do a write up on, but I'm just apologizing for it taking

 me months over the winter.   I'll let you know if it helps a lot.

 I'll possibly replace my tires this spring too...now that I've hit

 325 hours.  I got better ones this time than the standard ones.

 Wish I could try Scott's fancy goodyears though.   My guess is

 that tire roundness and balance could be affecting you if it's

 that bad....or at least that your side to side axle yoke preload

 is too loose, or your axle bolt is too loose.   My only shimmy

 seems to happen between 35 and 40kts.  Except I do think I get

 some main gear shimmy that I'm hoping can be taken care of by the

 balance and tires.  This spring I'll report back.  Nothing I

 have right now though is severe or overly concerning.



 Tim Olson - RV-10 N104CD - Flying

 do not archive

 Rob Kermanj wrote:

> I agree Robin but I am at the end of my rope.  If I relax or take  

> the weight off the nose wheel, the shimmy get more aggravated.

> Rob.

> On Mar 26, 2008, at 11:38 AM, Robin Marks wrote:

>> Rob,

>>                I don’t think pushing forward on the stick is the  

>> proper way to resolve the shimmy. It may help but my guess is that  

>> that is a mask for the real issues. In all my RV flying experience  

>> on never wants to add more weight / forces to the nose wheel. In  

>> my 6A we keep the wheel off the ground as long as we have  

>> authority and then the stick is back in my lap the entire time I  

>> taxi. Same is true when I took a demo ride with Mike Seager in the  

>> factory 10. He starts the 10 with the stick full back and does not  

>> release it till Run Up. Same with his taxi back.  Now the A model  

>> Vans are known for their less than Cessna like gear durability but  

>> properly flown there should never see a problem. Adding greater  

>> forces by pushing the stick forward is not a solution to the shimmy.

>> Good luck,

>> Robin

>> *From:* owner-rv10-list-server(at)matronics.com <mailto:owner-rv10-list-server(at)matronics.com 

>> > [mailto:owner-rv10-list-server(at)matronics.com] *On Behalf Of  

>> *linn Walters

>> *Sent:* Wednesday, March 26, 2008 9:03 AM

>> *To:* rv10-list(at)matronics.com <mailto:rv10-list(at)matronics.com>

>> *Subject:* Re: No takers?

>> The axle rotation won't have anything to do with shimmy, defined  

>> as the shopping cart wobble back and forth.  Fix that by  

>> tightening the  nut on the nose gear tube.  A 25-30 pound pull on  

>> the wheel axle (off the ground of course) should make the nose  

>> gear shimmy free.

>>

>> As for wheel hop ..... an up and down vibration ..... tire balance  

>> or an out-of-round tire will cause that.  Bearing preload is a  

>> contributing factor ..... less than one rotation of the tire when  

>> spun by hand should be good.

>>

>> Now, a caveat here .... my info comes from adjusting my AA-1B  

>> which has a similar  castering nosegear.  Should work for an RV-10.

>> Linn

>>

>> Rob Kermanj wrote:

>>

>> Tim,  I got the updated spacer and still had shimmy problems.  I  

>> filed a flat spot on the axel and installed two set screws on the  

>> spacers.  This helped a lot but I still experience shimmy.  I  

>> learned on this site to push the stick forward to stop the shimmy  

>> and it works for the most part.  You still go through some shimmy  

>> before you stop it.

>> My nose wheel is nice a tight without any slop.  I cannot figure  

>> out why I still experience some shimmy.  I have done (at least I  

>> think) everything that has been published.  The set screws did  

>> make a remarkable difference.

>> Rob.

>> On Mar 26, 2008, at 9:50 AM, Dawson-Townsend,Timothy wrote:

>>

>> No nibbles on this question from the other day?

>> *For the folks who are flying:*

>> * *

>> * *

>> *How about an update on the nose gear axle spacers?  Are  

>> installations*

>> *with the "new" aluminum spacers working well as designed, or are*

>> *supplemental measures to ensure the spacers can't rotate still*

>> *warranted?*

>> * *

>> * *

>> *Inquiring minds want to know . . .*

>> * *

>> * *

>> *TDT*

>>  Tim Dawson-Townsend

>> Aurora Flight Sciences

>> tdt(at)aurora.aero <mailto:tdt(at)aurora.aero>

>> 617-500-4812 (office)

>> 617-905-4800 (mobile)

>> *http://www.matronics.com/Navigator?RV10-List*

>> *blue; text-decoration: underline; ">http://forums.matronics.com*

>> *style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution*

>> * *

>>  * *

>> * *

>> * *

>> * *

>> * *

>> http://www.matronic           - MATRONICS available via the Web  

>> href="http://forums.matronics.com">http:// 

>> forums.matronics.com===================http://www.matronics.com/c=

>> * *

>> <http://www.matronics.com/contribution>

>> <http://www.matronics.com/contribution>

>> ** <http://www.matronics.com/contribution>*http://www.matronics.com/Navigator?RV10-List

>> blue; text-decoration: underline; ">http://forums.matronics.com

>> style="color: blue; text-decoration: underline; ">http://www.matronics.com/contribution

>>

>> *

>>

> *

> *

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Wed Mar 26, 2008 9:20 am Post subject: No takers?

The balancer I have is a motorcycle tire balancer that I got

with the proper sized cones for these tires.  I'll have to

dig up pictures for the write up.  Vic bought one that was

slightly different that also would do just as well.  I think

it was around $100 but don't quote me on that.



Also, as others mentioned wheel fairings....I did actually

balance at least my nose fairing.  I balanced a ziplock

bag of lead shot taped to the nose when I first made them,

and then I poured the lead into the inside of the nose cap

and epoxied it in place.  Probably should have left it in

the ziplock and epoxied the whole thing in place.

Anyway, I balanced the nose. I don't think I did the mains

but some day this spring maybe I'll do that just for

good measure.



Tim Olson - RV-10 N104CD - Flying



Rob Kermanj wrote:

 	  Quote: 	
		   

 

 My situation seems to be exactly like yours:  low speed, not severe and 

 manageable.   I had someone on the ground check the vibration and they 

 told me that it is definitely from the nose wheel.

 

 I also have really nice lateral fit on the axel and nothing is loose at 

 all.  If you do your balancing and get good results, let me know.

 

 What kind of balancer do you have?

 

 

 Rob.

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