REFLECTOR: FG Nosewheel Shimmy

[Lou Stedman]

That is very interesting. Years ago a friend lost a tube on landing in South 
Carolina in his LongEZ . We went to three different places looking for a 
replacement tube with no luck. No one wanted anything to do with an airplane 
tire. We finally realized this and asked for a lawn mower tire and there was 
no problem.

-----Original Message----- 
From: Mark Magee
Sent: Wednesday, March 07, 2012 12:58 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: FG Nosewheel Shimmy

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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