REFLECTOR: Shimmy and Nose Gear Pivot Bushings

[michalk]

I always wondered why there hasn't been an example where a 
counterbalance was used?

The problem is that the CG is aft of the pivot point.  If one needs to 
use ballast anyway, place a counterbalance to get the CG closer to the 
pivot point.

Might be a problem with RG's, maybe easier with fixed gear.  Get the 
center of lift to be aft of pivot as well and have self centering 
nosewheel, with a very light easy to steer friction system.

Ron Brown wrote:
> I discovered how destructive nose wheel shimmy can be.
> 
> On a half dozen or so occassions, I have had nose wheel shimmy after 
> landing.  The last time, I smelled hot epoxy.  After shut down I did 
> some investigating and found that the right side pivot bushing had 
> worked loose from its mounting in the keel. It had worn the hole into an 
> egg shape with most of the wear toward the lower front of the bushing 
> mounting.
> 
> I have epoxied a new bushing into place using the Aeropoxy structural 
> adhesive.
> 
>> From now on, I am going to keep my bellville washers clean and tighter to 
> 
> minimize - or rather prevent nose wheel shimmy.  (sure makes steering 
> tougher - especially on take off)
> 
> Has anybody else had this problem?  I am guessing there is a problem in 
> that there is a new and improved mounting for these bushings.
> 
> Do I also need to go ahead and plan to replace these with the new 
> bushings and plates that are shown in the latest on-line plans?
> 
> Ronnie
> 173 Elite RG
> 
> 
> 
> (173 Elite RG).
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