REFLECTOR: FG Nosewheel Shimmy

Wed Mar 7 23:22:34 CST 2012

Hi Robert,
I've heard of this but can't recommend it. This product is designed primarily for semi trucks. Remember all the bead material will be in the bottom of the nosewheel as it is stationary prior to touchdown. Once the zero-to-80ish-kts-in-.25 seconds happens the wheel should come into balance quickly. That time required to get the tire spinning and the bead material distributed equally throughout the tire I believe is long enough to pull the 'trigger' on the vibration that sets off the destructive shimmy. Once the shimmy is initiated by the tire momentarily out of balance (beads at bottom of tire while stationary) it is transmitted to the gear leg itself, starting a lateral wobble that the damper can't control, (NO MATTER HOW TIGHT!) and moves into a destructive cyclic reaction between the damper and vibrating gear leg.
Makes my stomach turn to to review this....
Next parts start flying off the plane heading to your MT prop.
The clowns in Livermore CA tried to write me up for shedding my nose pant on the active runway there after one of my numerous nosewheel shimmy incidents. The good folks in Deer Valley AZ were kind enough to return the fragments of the just repaired nose pant after it let go on that landing.
Don't put any pants on your nosewheel unti you've logged quite a few shimmy-free hops.

Mark B. Magee
Sent from IPhone 4

On Mar 7, 2012, at 8:34 PM, Mr Robert Geis <regeis55 at yahoo.com> wrote:

> Has anyone ever tried tire beads for balancing airplane tires?  Just curious.
> 
> Bob Geis
> Snohomish, Wa
> 
> From: Mark Magee <edjonesbrady at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org> 
> Sent: Wednesday, March 7, 2012 2:16 PM
> Subject: Re: REFLECTOR: FG Nosewheel Shimmy
> 
> He cleaned the wheel with alcohol I believe and then just stuck them on. As I recall he stuck them on a horizontal surface so that centrifugal force will help them stay put.
> 
> Mark B. Magee
> Sent from IPhone 4
> 
> On Mar 7, 2012, at 2:44 PM, Kevin Baker <flykb at verizon.net> wrote:
> 
> > After you apply the sticker weights how do you keep the weight from coming off?
> > Thanks
> > Kevin 
> > 
> > .
> > 
> > On Mar 7, 2012, at 14:13, Mark Magee <edjonesbrady at gmail.com> wrote:
> > 
> >> Yes by hand. No charge either. Smooth as silk now.
> >> 
> >> Mark B. Magee
> >> Sent from IPhone 4
> >> 
> >> On Mar 7, 2012, at 12:15 PM, Scott Derrick <scott at tnstaafl.net> wrote:
> >> 
> >>> so he just spun it by hand?
> >>> 
> >>> -------- Original Message --------
> >>> Subject: Re: REFLECTOR: FG Nosewheel Shimmy
> >>> From: Mark Magee <edjonesbrady at gmail.com>
> >>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> >>> Date: 03/07/2012 10:58 AM
> >>> 
> >>>> Hi Kevin,
> >>>> Interesting question: First I kept it on the yoke and I took it to the local tire shop and asked for help. The guy I know who owns the shop (rural central Texas: lots of tractor tire carcasses about) said nothing to me and walked it over to his vise and using a rag to prevent damage to the aluminum clamped the yoke in his vise.
> >>>> "How fast will this tire go," he asked as a small crowd began to gather and watch.
> >>>> "90 MPH" I replied.
> >>>> He again said nothing and began to spin the tire (yoke clamped vertically) and watch where the tire settled and began applying stick on weights opposite the low spot. After a while of this methodology the tire would never land on the same spot after spinning an it was balanced.
> >>>> A rancher walked in to his shop an seeing the on-lookers asked the shop owner what he was doing.
> >>>> "Mark says he needs to go 90 MPH on his -ZTR- (mower)!
> >>>> They all got a good laugh at my expense... I explained it was a flying machine.
> >>>> Any tire shop that handles ag or lawn equipment can balance your nosewheel or main mounts for that matter, the old fashion way.
> >>>> 
> >>>> Mark B. Magee
> >>>> Sent from IPhone 4
> >>>> 
> >>>> On Mar 7, 2012, at 11:40 AM, Kevin Baker<flykb at verizon.net>  wrote:
> >>>> 
> >>>>> Hi Mark
> >>>>> How did you balance your wheel ?
> >>>>> 
> >>>>> Thanks
> >>>>> Kevin
> >>>>> 
> >>>>> .
> >>>>> 
> >>>>> On Mar 7, 2012, at 11:20, Mark Magee<edjonesbrady at gmail.com>  wrote:
> >>>>> 
> >>>>>> All,
> >>>>>> In cogitating on the nosewheel shimmy trial I went through, I forgot to mention that Scott Swing recommended a perfectly balanced nosewheel, which I took care of. In balancing the nosewheel/tire combo it was readily apparent it was grossly out of balance. Apparently an out of balance nosewheel/tire combo is the 'trigger' that starts the destructive shimmy (vibration).  So my nosewheel shimmy was solved in 2 pieces: Jorge Bujanda style bumper (I made my own from a block of urethane) and a perfectly balanced nosewheel/tire assy. Once done do a high speed taxi to confirm.
> >>>>>> 
> >>>>>> Ahhhhhh... Smooth as glass now.
> >>>>>> 
> >>>>>> Mark B. Magee
> >>>>>> Sent from IPhone 4
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