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Nose wheel pant vertical oscillation

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jhnstniii(at)AOL.COM
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Posted: Thu Jun 18, 2009 5:39 pm Post subject: Nose wheel pant vertical oscillation

Listers--Our nose wheel pant is oscillating vertically at all speeds above slow taxi.  The oscillation is reduced (but not eliminated) with aft stick pressure but of course you need airspeed to make that work.  Our nose gear pant is balanced fore and aft.  Vans suggested checking the nose gear tire for roundness, which we will do.  We will also check for tire balance, but are not sure how to affix a weight if needed.  We've tried different tire pressures--no change.  We have the new style nose gear fork and our bearing torque is per specs.  Anyone else have this problem, and if so how did you solve it?  We have the new style nose gear fork and our axle bolt/bearing torque is per specs.  Thanks. 

 

 LeRoy Johnston and David White N176LD "Esperanza" RV-6A 180 hours flying Make your summer sizzle with fast and easy recipes for the grill. 

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ronlee(at)pcisys.net
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Posted: Thu Jun 18, 2009 6:23 pm Post subject: Nose wheel pant vertical oscillation

Out of round is obvious if you place a stick or pen close to 

 the tire and observe the separation as the tire slowly rotates.

  

 Balance using adhesive backed weights you can get from 

 places like motorcycle shops

  

 Ron Lee

  

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jim jewell

Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada

Posted: Thu Jun 18, 2009 7:42 pm Post subject: Nose wheel pant vertical oscillation

LeRoy,

  

 With the nose wheel jacked up off the ground will  the wheel move freely by hand? If you try to spin by hand it does it resist  spinning more than one complete rotation?

  

 The axel hardware supplied with my 1996 Kit did not  have a bearing spacer and no bearing spacer was indicated on the  plans.

  

 I noticed I had the same problem that you describe.  I double checked the install and torque settings. All were to spec. It seemed to  me that using the Van's torque spec. made the nose wheel far too tight in it's  bearings (excessive preload)

 I backed off the torque setting only slightly and  found that the reduced torque caused the axle bearings and spacers to spin  leaving galling damage to the fork.

 Fortunately the new style nose gear fork had just arrived about  then. I gave the matter considerable thought and researched a  bit.

  

 I ended up  making a chrome molly tubing spacer to fit between the bearings that allowed the  wheel to turn with only a slight bit of preload. The wheel hop and shimmy went  away and so far all is well. I do not have many hours on the current set up so I  cannot promise or suggest that others should do as I have done based on hours of  durability.

 The tubing I  used was one 1/16th" thick wall 1 3/8" outside diameter. The  length of the spacer to accomplish the preload was  determined at the  time of custom fit and installation.

 With the  preload now predetermined mechanically, the axle bolt can be tightened  somewhat more than the Van's spec without adversely effecting bearing  preload.

  

 Jim in  Kelowna       

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jhnstniii(at)aol.com
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Posted: Fri Jun 19, 2009 3:21 pm Post subject: Nose wheel pant vertical oscillation

Thanks to you and others who replied.  Will try some things and report.  Do not archive.

 

 

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