REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

[nmflyer1 at aol.com]

Good to know, Thanks!

Kurt 
173 FGE
Aluminum V-6






-----Original Message-----
From: WJ Wibeck <wjwilbeck at gmail.com>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Mon, Sep 5, 2011 2:57 pm
Subject: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication



Violent Nose Wheel Shimmy – I thought was a problem that only other folks have. I was wrong and wanted to share my experience.
 
Aircraft is Velocity 173 FG which is a Standard Width Cockpit with Hatch Entry and Long Wings similar to the XL Wing.
It has 260 flight hours with no shimmy at all, until now. I am pretty sure that I know the cause of my Shimmy.
This was the first Flight after I Lubricated the Nose Gear Swivel Washers. 
I normally lubricate the washers with Wheel Bearing Grease but this time I squirted it with a Light Gun Oil.
I used the Light Oil this time because the Break-Out Force of the nose wheel was High and the Turning Tension was fairly low.
The Light Oil reduced the Break-Out Force a lot so the Turning Force was not much Greater than the Break-Out Force.
 
So – I am of the opinion that on my Velocity it is better to use Wheel Bearing Grease that results in Higher Break-Out  Force and a Lower Turning Force.
 
 
wj
 
WJ Wilbeck


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