Today's Message Index:
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1. 10:34 AM - Wheel shimmy on take off (JohnF)
2. 01:16 PM - Re: Wheel shimmy on take off (Ollie Washburn)
3. 01:52 PM - Re: Wheel shimmy on take off (JohnF)
4. 02:02 PM - Re: Re: Wheel shimmy on take off (Warren Brecheisen)
5. 03:04 PM - Re: Wheel shimmy on take off (JohnF)
6. 04:13 PM - Re: Re: Wheel shimmy on take off (Warren Brecheisen)
Message 1
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| Subject: | Wheel shimmy on take off |
I replaced tires and brake shoes on my RV-12 during its annual. Purchased Aero
Classic tires. One was out of balance and when on taxi it seemed as if I was going
over rumble strips. Dresser replaced the tire at no cost.
I replaced the tire. Still have a shimmy on take off...it damps off quickly, but
only the right side does this.
Talked to MATCO who made wheels/brakes...they suggested tightening the retaining
nut on the axle more until the wheel no longer freely rotated when spun and
plane lifted so wheel was off ground. This helped a bit but didn't cure the problem...its
not so severe that its going to hurt anything, but until I changed
tires/brake pads I never had this, so something is wrong.
Bearings well lubed and seem OK. Tire inflation is proper.
Only thing left I can think of is to simply throw money at the problem by replacing
the Aero Classic tires with Goodyear Flight Custom III and new bearings.
Throwing money at a problem is crude but often very effective.
Your suggestions>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426087#426087
Message 2
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| Subject: | Re: Wheel shimmy on take off |
Use a wheel balancer and balance the wheel & tire
Sent from my iPad
> On Jul 4, 2014, at 1:34 PM, "JohnF" <n29cx@ridgeviewtel.us> wrote:
>
>
> I replaced tires and brake shoes on my RV-12 during its annual. Purchased Aero
Classic tires. One was out of balance and when on taxi it seemed as if I was
going over rumble strips. Dresser replaced the tire at no cost.
>
> I replaced the tire. Still have a shimmy on take off...it damps off quickly,
but only the right side does this.
>
> Talked to MATCO who made wheels/brakes...they suggested tightening the retaining
nut on the axle more until the wheel no longer freely rotated when spun and
plane lifted so wheel was off ground. This helped a bit but didn't cure the
problem...its not so severe that its going to hurt anything, but until I changed
tires/brake pads I never had this, so something is wrong.
>
> Bearings well lubed and seem OK. Tire inflation is proper.
>
> Only thing left I can think of is to simply throw money at the problem by replacing
the Aero Classic tires with Goodyear Flight Custom III and new bearings.
Throwing money at a problem is crude but often very effective.
>
> Your suggestions>
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=426087#426087
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Wheel shimmy on take off |
I should have mentioned that I used a McFarlane pendulum balance unit and very
very carefully balanced the tire/wheel/brake disk...all the spinning components...did
this twice...no help...tire mounted correctly per red dot...real mystery.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426094#426094
Message 4
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| Subject: | Re: Wheel shimmy on take off |
Did you check the "roundness" of the tires? In other words, is the outside
of the tire concentric with the axle centerline. Since this was not a
problem before you did all the service work, it would seem to point to
either a mistake made during the service work or faulty parts. You didn't
mention the front wheel. Have you checked to see that everything is ok
there?
Warren
-----Original Message-----
From: owner-rv12-list-server@matronics.com
[mailto:owner-rv12-list-server@matronics.com] On Behalf Of JohnF
Sent: Friday, July 4, 2014 3:52 PM
Subject: RV12-List: Re: Wheel shimmy on take off
I should have mentioned that I used a McFarlane pendulum balance unit and
very very carefully balanced the tire/wheel/brake disk...all the spinning
components...did this twice...no help...tire mounted correctly per red
dot...real mystery.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426094#426094
Message 5
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| Subject: | Re: Wheel shimmy on take off |
YEs, Warren, nose wheel is OK. sUspect tire after one was really out os round.
Local tire shop could mount it and get an accurate determination of roundness.
I put a stationary pointer on the edge of the tire and rotated it ..seemed
round, even if my method was not so exact.
I expect that I will end up removing the Aero Classic tires and replacing them
with Goodyear Flight Custom III s.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426098#426098
Message 6
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| Subject: | Re: Wheel shimmy on take off |
Sorry to hear of your frustration and extra expense. By the way, regardless
of what the wheel manufacturer said, I would never tighten wheel bearings to
the point where they are draggy. There's sort of a sweet spot just before
the bearings get draggy which is where you want to be.
Warren
-----Original Message-----
From: owner-rv12-list-server@matronics.com
[mailto:owner-rv12-list-server@matronics.com] On Behalf Of JohnF
Sent: Friday, July 4, 2014 5:05 PM
Subject: RV12-List: Re: Wheel shimmy on take off
YEs, Warren, nose wheel is OK. sUspect tire after one was really out os
round. Local tire shop could mount it and get an accurate determination of
roundness. I put a stationary pointer on the edge of the tire and rotated
it ..seemed round, even if my method was not so exact.
I expect that I will end up removing the Aero Classic tires and replacing
them with Goodyear Flight Custom III s.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426098#426098
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