REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

Wed Sep 7 18:17:11 CDT 2011

Also hardwood is easy to put in with little help no installation fee.... Hardwood needs to adjust to your  home  let wood sit in house for at least a week before installation.  Will be home at end of Sept.   what is sex of babe and what is favorite kid cartoon character. 
  ----- Original Message ----- 
  From: nmflyer1 at aol.com 
  To: reflector at tvbf.org 
  Sent: Tuesday, September 06, 2011 5:25 PM
  Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

  Interesting information Brian.  Definately something that I was not aware of. 

  Do you think this would be worth a test run?:  http://www.amazon.com/Lubricant-Grease-Nyogel-2oz-Tube/dp/B005KLCXDQ/ref=sr_1_1?ie=UTF8&qid=1315344168&sr=8-1

  Quite a bit less spensive for a test. 

  Kurt 

  -----Original Message-----
  From: Brian Michalk <michalk at awpi.com>
  To: Brett Ferrell <reflector at velocityxl.com>; Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
  Sent: Tue, Sep 6, 2011 10:14 am
  Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

  Perhaps a damping grease would work better?
  A damping grease is a dilatant, or shear thickening lubricant.  It has the property of exhibiting higher viscosity when under shear.

  Almost all lubricants are the opposite.  Greases in particular are thixotropic.  They become solid at rest, and liquids under shear, which is the opposite of what we need.

  I would like to try this one day.  Here is a link to a kit containing various samples:
  http://www.lubekits.com/?load=grease

  There may be other sources, perhaps motorcycle fork oil, chain grease, shock absorber oil or limited slip differential oil could be dilatant greases.

  On 9/6/2011 9:13 AM, Brett Ferrell wrote: 
    We replaced the phenolic with the nylon, so YES, we still use the standard belleville washers, grease, and check them before each flight, but we find that we can tighten the nut tighter and still maintain pretty easy steering.  We also keep the tension higher since Scott Swing visited, as he thought our nose wheel was 'too loose' at what we believed was the prescibed tension.  I think the manual calls for 15 pounds break-out, and with our test rig what felt right to Scott measured about 25.

    We have the Mishler lock, but we do not use it.  It's probably fine, but we heard a couple of stories that worried us, one person tossed their nose pant and someone else's wheel got locked sideways and they had some trouble controlling the plane with the pant cocked to one side.  Scott S really likes the lock, though (or at least did) and encouraged us to use it.  He may favor the dampener now, I'm not sure.

    We've been flying with the nylon nut for over a year and have really liked it.  All of our "practical" flying has been done with it, but I'd have to look at a log to say for sure how many hours.  It's probably in the 30-40, but we have a ton of landings as it seems we're always testing something (pants, vgs, props, whatever).  We certainly don't have years and years on ours, but so far we have been happy.

    Brett

         -------Original Message-------
          From: Scott Derrick 
          To: Brett Ferrell , Velocity Aircraft Owners and Builders list 
          Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication
          Sent: 06 Sep '11 08:47

          So Brett,

          No Belleville washers at all? Just a couple of thick nylon washers?

          How many hours/landings would you estimate?

          Do you still check the nose turning tension as part of preflight?

          Scott

          -------- Original Message --------
          Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication
          From: Brett Ferrell 
          To: reflector 
          Date: 09/06/2011 05:35 AM

            I would definitely use the grease, but we've been flying the nylon nut solution for awhile and really like it.  It keeps a relatively usable break-out force but still has enough friction to damp out shimmy.  We think the airplane stays very steerable with this setup.
            http://www.velocityxl.com/wiki/index.php?title=Nylon_Belleville_Anti-Shimmy

            Brett

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