REFLECTOR: FG Nosewheel Shimmy

Scott Derrick scott at tnstaafl.net
Wed Mar 7 12:15:30 CST 2012


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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