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Nose Wheel Spacer - Shimmy

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jesse(at)saintaviation.co
Guest

Posted: Wed Feb 04, 2009 1:24 pm Post subject: Nose Wheel Spacer - Shimmy

I know this have been mentioned on the list before, but I have some new experience that I thought I would share to the list.  I have recently checked the need for an additional spacer under the WD-1015 Nose Gear Link Collar.  I found that to put a little preload on the Nose Gear Elastomers, I had to add 2 spacers for a total of 3 after the elastomers had seated.  This definitely seems to help the shimmy issue.  Also, on the nose gear axle, with the newer Van's spacers and after turning about 1/16" off the end of the axle (making it shorter to preload the bearings with the spacers), there seems to be no movement of the spacer or bearing after substantial use.  The key, I think, is to shorten the axle a little bit.  I have seen that the Bellville Washers that control the tension on pivoting the fork does loosen over time, and not just once, which can really cause a shimmy if loose.  The problem is getting the 26 lbs of force that Van's recommends with a 1/6th turn increment on that castle nut.

 Jesse Saint

Saint Aviation, Inc.

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

Cell: 352-427-0285

Fax: 815-377-3694



 

 [quote][b]

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Wed Feb 04, 2009 2:34 pm Post subject: Nose Wheel Spacer - Shimmy

I know that on Mooneys, no play at all is allowable for the nose gear

shock disks..probably exact same parts from Lord. In fact, when new

there is a LOT of force compressing those disks. Once they age to

where there isn't pre-tension on the disks, they need to be replaced

on Mooneys.



On Wed, Feb 4, 2009 at 2:23 PM, Jesse Saint <jesse(at)saintaviation.com> wrote:

 	  Quote: 	
		   I know this have been mentioned on the list before, but I have some new

 experience that I thought I would share to the list.  I have recently

 checked the need for an additional spacer under the WD-1015 Nose Gear Link

 Collar.  I found that to put a little preload on the Nose Gear Elastomers, I

 had to add 2 spacers for a total of 3 after the elastomers had seated.  This

 definitely seems to help the shimmy issue.  Also, on the nose gear axle,

 with the newer Van's spacers and after turning about 1/16" off the end of

 the axle (making it shorter to preload the bearings with the spacers), there

 seems to be no movement of the spacer or bearing after substantial use.  The

 key, I think, is to shorten the axle a little bit.  I have seen that the

 Bellville Washers that control the tension on pivoting the fork does loosen

 over time, and not just once, which can really cause a shimmy if loose.  The

 problem is getting the 26 lbs of force that Van's recommends with a 1/6th

 turn increment on that castle nut.

 Jesse Saint

 Saint Aviation, Inc.

 jesse(at)saintaviation.com

 Cell: 352-427-0285

 Fax: 815-377-3694

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

pitts_pilot(at)bellsouth.
Guest

Posted: Wed Feb 04, 2009 7:29 pm Post subject: Nose Wheel Spacer - Shimmy

Jesse Saint wrote:

SNIP

 	  Quote: 	
		     I have seen that the Bellville Washers that control the tension on 

 pivoting the fork does loosen over time, and not just once, which can 

 really cause a shimmy if loose.  The problem is getting the 26 lbs of 

 force that Van's recommends with a 1/6th turn increment on that castle 

 nut.

More is better .... at least on my Grumman which has the same setup.  
	


The specs for the Grumman are 25 Lbs, measured by pull at the axle, but 

experience is that near 30 is better.  Different scenarios in stacking 

the washers also makes a difference.  Stacking two washers belly up and 

two washers belly down should help with the loosening problem.  since I 

haven't gotten that far, I have no idea how Van recommends stacking the 

washers.

Linn

 	  Quote: 	
		  

 Jesse Saint

 Saint Aviation, Inc.

 jesse(at)saintaviation.com <mailto:jesse(at)saintaviation.com>

 Cell: 352-427-0285

 Fax: 815-377-3694



 *

 *

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