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1. 11:39 AM - Re: Wheel shimmy - solutions? (Bill Strahan)
2. 11:52 AM - Re: Wheel shimmy - solutions? (Bill Strahan)
Message 1
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| Subject: | Re: Wheel shimmy - solutions? |
Buz:
It's not a perfect solution, but bird in hand...
Anyway, try this:
Go to google.com and do a search that looks like this.
shimmy site:flylightning.net
You can replace the "flylightning.net" with any site that is hosting the newsletters.
You'll get a list of pages, almost all of which will be PDF files from the newsletters,
that have the word "shimmy" in them.
You can hold down the shift key while clicking on the "quick view" link for the
search results and it will open the PDF. You may then have to put the search
term in the PDF viewer as well, but this will at least take you to newsletters
with the words you're looking for.
Trying "tire pressure site:flylightning.net" brought up a list of newsletters that
talk about tire pressure. You get the idea.
Again, not perfect, but it's pretty useful.
Now, back to shimmy. I had already searched all the newsletters and I had also
searched the Matronics list before I made my post. The info is all over the
map, and most of it is a) stiffen gear legs, b) 6 ply tires, c) set toe in, or
out, or neutral, and d) balance the wheel/tire assembly.
I had already balanced my tires using a motorcycle wheel balancer. It could tell
a difference in how smooth it rolled when it wasn't shimmying, but it didn't
help the shimmy. So my real intention was to find out what was really working...I
guess the best thing would be to take a poll.
Poll one would be for people who never had shimmy. What is their setup, notably
the tires and the toe in/out?
Poll two would be to find out what you did to fix shimmy if you had it. What finally
worked.
Since I've balanced my tires I'm leaning towards getting 6-ply tires and balancing
again and installing. It's the least work and least modification to the airframe.
If that doesn't do it, I think I'll make some wooden stiffening pieces
to glue to the front and back of the gear.
The goal would be to get as much bending moment away from the center of the rod
to raise the stiffness and perhaps get the resonant frequency above what is generated
at the speed I see on the ground.
I had also mentioned to Nick that it might be worthwhile to find someone who could
machine some bar stock into a landing gear. Take a piece of aluminum the
length of the current gear leg, as thick as the current gear, but about twice
as wide. Machine the ends into the rod shape needed to fit in the spar box and
in the axle weldment. Then machine the rest of the bar into a teardrop shape.
Drill the teardrop part for the brake line, and now you don't need any type of
landing gear leg fairing. The teardrop shape would start just outside the fuselage
and would end just before the axle weldment, so simple fairings like I already
have to fair that shape into the fuse and the wheelpants would be all you'd
need.
The leg would have almost the same flexibiltiy in landing, but would be much stiffer
fore and aft due to the added material further away from the neutral line.
I have no idea the cost of that process, perhaps Grove would give an estimate.
But If the additional cost wasn't more than about $500 I think it would be slam-dunk
considering you would save the cost and installation time of the gear
leg fairings.
And I'd be happy to beta test them for free!
I will document my progress in addressing this issue for 7RW.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327915#327915
Message 2
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| Subject: | Re: Wheel shimmy - solutions? |
Okay, another quick question, hopefully someone is reading to the bottom of this
thread.
If I order Aero Classic 5.00 X 5 tires do I need to get matching tubes or can I
reuse my old tubes?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327919#327919
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