REFLECTOR: FG Nosewheel Shimmy

[John Dibble]

That's how I balance mine.  I don't spin it fast, just give it a little 
spin and see where it settles.  Then I temporarily tape weights to the 
rim at the top side and keep adjusting the weight until it quits 
stopping at one location.  Then I silicone the weight.

John

On 3/7/2012 12:15 PM, Scott Derrick 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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>