REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

Brett Ferrell reflector at velocityxl.com
Tue Sep 6 09:13:51 CDT 2011


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 [LINK: mailto:reflector at velocityxl.com]
   To: reflector [LINK: mailto:reflector at tvbf.org]
   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.
[LINK:
http://www.velocityxl.com/wiki/index.php?title=Nylon_Belleville_Anti-Shimmy]
http://www.velocityxl.com/wiki/index.php?title=Nylon_Belleville_Anti-Shimmy


Brett


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