Hi Jonathan,
Since the friction disc is pin located to the fork assembly it is pointless
applying the grease to the underside of the plastic disc.
The break out friction referred to is a feature of the speed of application
of movement. Just applying a progressive load as in the 20 lb test will not
produce the break out effect that you are looking for. Speaking
scientifically, the friction torque generated by the grease is related to
velocity by a hysteresis curve. Ie the greater the surface speed the
greater the friction torque produced.
In fact the only way to demonstrate the result of applying the grease is to
fly the beast.
If you set the friction, as per the manual, then you will achieve exactly
the result you require.
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of jonathanmilbank
Sent: 03 March 2013 23:38
Subject: Europa-List: Re: Damping Grease
Hi Bud,
Neville Eyre recently did the really difficult work on my old monowheel
G-EIKY and converted it to a trigear. I then towed it away to do the long
list of tasks necessary before it can be inspected and signed off.
Today I proceeded to remove the nosewheel fork spindle and made sure that
the spindle, bushes and friction plate were clean and dry before applying
the Nye damping grease to all relevant surfaces, including both sides of the
friction disk. The Nye grease is also lubricating the bushes.
Quote from your post above "Note there are two frictions. The first is the
torque to break the friction, then there is the rotational torque." Well, if
the damping grease gets applied to one side or both sides of the disk, then
there is no longer a friction break-out torque.
Having tightened the assembly a lot and with the wheel off the ground, all I
can discern is a constant 18 to 20 pounds resistance when pulling the
nosewheel from side to side. There is no break-out. This being my first
experience of setting up a Europa nosewheel, I would appreciate comments and
advice from you or anyone else.
Comparing my Europa nosewheel with other aircraft of different types also
having castoring nosewheels, mine seems excessively heavy to turn from side
to side. Yes, I did tie a cable to the wheel axle and wrap it 90 degrees
around the rear of the tyre before pulling with a spring scale.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=395553#395553
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