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Wheel shimmy on take off

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Fri Jul 04, 2014 9:34 am Post 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>

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Ollie Washburn

Joined: 10 Jan 2006
Posts: 56
Location: Central Florida

Posted: Fri Jul 04, 2014 12:16 pm Post subject: Wheel shimmy on take off

Use a wheel balancer and balance the wheel & tire



Sent from my iPad



 	  Quote: 	
		   On Jul 4, 2014, at 1:34 PM, "JohnF" <n29cx(at)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

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_________________
Ollie RV6-A & Rans S7S
Central FL

JohnF

Joined: 13 May 2010
Posts: 124

Posted: Fri Jul 04, 2014 12:51 pm Post 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

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n146wb(at)cfu.net
Guest

Posted: Fri Jul 04, 2014 1:02 pm Post subject: 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 



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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Fri Jul 04, 2014 2:04 pm Post 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.

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n146wb(at)cfu.net
Guest

Posted: Fri Jul 04, 2014 3:13 pm Post subject: 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



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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sat Jul 05, 2014 8:48 am Post subject: Re: Wheel shimmy on take off

I just gave up ! On take off this morning the 'bad' tire/wheel combo rumbled a lot on take off roll, and again quickly dampened after lift off.



I just ordered two Goodyear Flight Custom III and will post results after they are installed and tested.



Thanks for suggestions for you folks.

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Jul 13, 2014 8:40 am Post subject: Re: Wheel shimmy on take off

Problem solved !  I had replaced tires on the RV-12 with Aero Classic units from Desser. One was badly out of round, and Desser replaced it at no cost. The replacement was better, but still out of round, and no amount of balancing can cure that.



I installed two Goodyear Flight Custom III tires after careful balancing, then flew. On run up and lift off the tires/wheels were perfect...like silk.. no noise, rumble, shimmy.,...nothing, just perfect operation.



I will keep one of original Aero's which did not exhibit any problem as a replacement for the future on the nose wheel, and discard the replacement since it can't be fixed.

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