Jon,
Glad to here you are progressing well.
I meant in my comments to apply the grease to both the disk (top side
only since there is a pin holding the disk immovable on the lower fork)
and the flat plate on the gear. Apply the grease to both the plastic
and the bearings is OK. As for our friction setting, it is a bit high
in comparison to the Yankee, or RV because our nose gear is at a shorter
caster distance like those annoying shopping cart wheels. It is set
this way to get the proper nose to main spacing and not interfere with
the prop and still be able to be kept light. I would say your current
setting about 20 is fine. However, if you lower the friction to 16 and
bang down the nose at high speed (over 50Kts.) it will likely shimmy.
Hence the book says 21 pounds. Set the torque near there and go test
it.
As far as the breakout, Pete gave a great answer. Once you let the gear
set a bit, it takes a bit more pull to get the gear moving than to go
around and around once it has started turning.
It's time to get into the plane and taxi, test and fly.
Regards,
Bud Yerly
----- Original Message -----
From: jonathanmilbank<mailto:jdmilbank@yahoo.co.uk>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Sunday, March 03, 2013 6:37 PM
Subject: Europa-List: Re: Damping Grease
<jdmilbank@yahoo.co.uk<mailto:jdmilbank@yahoo.co.uk>>
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<http://forums
.matronics.com/viewtopic.php?p=395553#395553>
http://www.matronics.com/Navigator?Europa-List<http://www.matronics.com/N
avigator?Europa-List>
http://www.matronics.com/contribution<http://www.matronics.com/contributi
on>
|