REFLECTOR: FG Nosewheel Shimmy

Mark Magee edjonesbrady at gmail.com
Wed Mar 7 14:13:14 CST 2012


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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> 
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