---------------------------------------------------------- RV12-List Digest Archive --- Total Messages Posted Fri 07/04/14: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 10:34:36 AM PST US Subject: RV12-List: Wheel shimmy on take off From: "JohnF" 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 _____________________________________ Time: 01:16:02 PM PST US From: Ollie Washburn Subject: Re: RV12-List: 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" 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 _____________________________________ Time: 01:52:02 PM PST US Subject: RV12-List: Re: Wheel shimmy on take off From: "JohnF" 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 _____________________________________ Time: 02:02:46 PM PST US From: "Warren Brecheisen" Subject: RE: RV12-List: 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 _____________________________________ Time: 03:04:47 PM PST US Subject: RV12-List: Re: Wheel shimmy on take off From: "JohnF" 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 _____________________________________ Time: 04:13:23 PM PST US From: "Warren Brecheisen" Subject: RE: RV12-List: 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. 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