Today's Message Index:
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1. 07:37 AM - Engine Cowl Cooling (jng62433@aol.com)
2. 04:03 PM - Re: Gear Leg Shimmy (JOSEPH MATHIAS LINDA MATHIAS)
Message 1
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| Subject: | Engine Cowl Cooling |
Lightning N166JG (Jim Goad)
I now have 48 hours total on my lightning and things are going well.? The new tires
helped the shimmy. I find a coincidence that there is a discussion on the
cowl and engine cooling, because about 2 weeks ago I was looking up into the
cowling opening near the nose landing gear supports on the motor mount.? I could
see that the paint was rubbed off of the tubing near the back cowl lip. By
pushing in the cowling back edge about 11/2" that was what had rubbed the paint
off.? Apparently in flight the back edge of the middle of the cowling was being
pushed in by air pressure.? It was an easy fix, all I did was hose clamp a
stop on the tubing so that it holds the cowling out and prevents it from flexing
upward.
Jim Goad
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Message 2
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| Subject: | Re: Gear Leg Shimmy |
Report on experiment # 2:
Today we removed the wheels and axles from the Lightning; wrapped
some shim material (beer can aluminum fits almost perfectly) around the
axle and reinstalled the wheels. I then performed taxi tests; taxiing
up to 33 kts ground speed, there was little to no shimmy. Ceiling never
raised above pattern altitude all day so taxi was the only possibility.
The slight roughness I felt at the highest speeds was probably the
runway surface. I want to fly it a couple of times before I remove
the aluminum angle Buz put on the gear then see if that makes any
difference. However, between the upgraded tires and the axle shimming,
we have greatly improved the situation. Assuming this continues to
offer improvement, we will probably remove the shim material when it
wears down and weld the axle into the socket to avoid having to
periodically replace the shim material.
Regards, Linda
----- Original Message -----
From: JOSEPH MATHIAS LINDA MATHIAS
To: lightning-list@matronics.com
Sent: Saturday, February 16, 2008 6:31 PM
Subject: Lightning-List: Gear Leg Shimmy
Well folks, we changed the tires on the main wheels today to Goodyear
Flight Custom IIIs; one of the original tires definitely was out of
round and quite obvious while spinning it on the axle during removal.
The new tires improved the shimmy a bit but it hasn't gone away.
However, we have a new theory: during the tire changing, we noticed
that the axle is quite loose on both main gear. The next idea is to
put some shim stock around the axle to tighten its fit in the socket.
Has anyone else noticed that the axle doesn't fit tightly?
I'll post the results when we get the axle tightened.
Linda Mathias
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