REFLECTOR:Nose Wheel Shimmy Brake Problem

[Scott Derrick]

Maybe I'm reading this incorrectly. Correct me if I'm wrong.

I went through the process of building new gear legs for my STD RG, long 
old story.  When fitting the new legs I noticed one of the legs slid 
just a bit back and forth on the pivot bolts, the other fit nice a snug. 
I was told by the factory to use washers to prevent this and not to over 
tighten the pivot bolt nut as this bends the bulkheads and puts a load 
on them. The nut on the pivot bolt should be tightened just enough so it 
is not loose.

My $.02

Scott

Chris Martin wrote:
> Don,
> 
> I did have the very same problem and I chased it all over the place. I
> found that the shimmy in the nose gear was the result of a shimmy in the
> mains. The mains had a small shimmy that was harmonic with the nose gear
> strut at about 20 MPH.
> 
> Try tightening the through bolts at the main pivot points for the nose gear
> and the mains. This was my biggest problem and solved almost all of my
> shimmy. Put the plane up on jacks and cycle the gear up. Place a box or
> some sort of 6 inch high block on the ground where the wheels come down.
> Then dump the emergency hydraulic release and let the gear down. The gear
> will stop on the blocks allowing you to lift them and feel the side to side
> play. I think you will find that they are loose. Lubricate the pivot points
> and tighten them up as much as you can without binding the gear. That
> should fix most of the shimmy.
>  
> Let me know if it helps.
> 
> Chris Martin
> 
> 
> 
>>[Original Message]
>>From: <Don19dw@aol.com>
>>To: <reflector@awpi.com>
>>Date: 6/12/2003 12:57:05 PM
>>Subject: REFLECTOR:Nose Wheel Shimmy Brake Problem
>>
>>Have not been able to solve the following problem: when braking to a stop
> 
> or 
> 
>>to turn off runway, get nose wheel shimmy, at low speed, 20 to 30 mph.
> 
> The 
> 
>>harder the braking the worse the shimmy, and it ceases shortly after
> 
> brakes are 
> 
>>released. Have installed latest Matco brake discs and pads. Discs look
> 
> smooth 
> 
>>and OK and are properly aligned. Checked nose wheel OK for balance and
> 
> not out 
> 
>>of round. Also have extra tight shimmy damp torque of maybe 30 to 40# of
> 
> force 
> 
>>to move tire sideways. Talked to both Matco and Velocity and tried their 
>>suggestions.  Only condition I find unusual is nose gear strut is about 7
> 
> degrees 
> 
>>forward at bottom end and factory says 2 degrees is normal. 
>>Any ideas?????  Did Chris Martin have this problem???
>>Don White     N19DW    XL/RG 
>>_______________________________________________
>>To change your email address, visit
> 
> http://www.tvbf.org/mailman/listinfo/reflector
> 
>>Visit the gallery!  tvbf:jamaicangoose
> 
> 
> 
> 
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
> Visit the gallery!  tvbf:jamaicangoose
>