REFLECTOR: Shimmy and Nose Gear Pivot Bushings
Alex Balic
alex157 at pwhome.com
Thu Nov 17 17:30:19 CST 2005
Good find Ron! Now is that damper leading or trailing? Hard to tell from
the picture, and no description......
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Ron Brown
Sent: Thursday, November 17, 2005 5:13 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Shimmy and Nose Gear Pivot Bushings
Brian,
I did a Google on "nose wheel shimmy" and got the following article on
F-15's and a fix for their long standing problem. See
http://engineering.wpafb.af.mil/success/F-15_Nose_Wheel_3_08_01.pdf
It involves what looks like a mass weight attached such that the center
of
mass is shifted forward. Looks like something worth trying assuming
there
is room for the bar when the gear is up - I think there is.
It sure would be nice to be able to reduce the shimmy nut torque to
something like 5-10 ft lbs instead of the difficult to steer 20 ft lbs.
Ronnie
----- Original Message -----
From: "michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Tuesday, November 15, 2005 11:19 AM
Subject: Re: REFLECTOR: Shimmy and Nose Gear Pivot Bushings
>I always wondered why there hasn't been an example where a
counterbalance
>was used?
>
> The problem is that the CG is aft of the pivot point. If one needs to
use
> ballast anyway, place a counterbalance to get the CG closer to the
pivot
> point.
>
> Might be a problem with RG's, maybe easier with fixed gear. Get the
> center of lift to be aft of pivot as well and have self centering
> nosewheel, with a very light easy to steer friction system.
>
> Ron Brown wrote:
>> I discovered how destructive nose wheel shimmy can be.
>>
>> On a half dozen or so occassions, I have had nose wheel shimmy after
>> landing. The last time, I smelled hot epoxy. After shut down I did
some
>> investigating and found that the right side pivot bushing had worked
>> loose from its mounting in the keel. It had worn the hole into an egg
>> shape with most of the wear toward the lower front of the bushing
>> mounting.
>>
>> I have epoxied a new bushing into place using the Aeropoxy structural
>> adhesive.
>>
>>> From now on, I am going to keep my bellville washers clean and
tighter
>>> to
>>
>> minimize - or rather prevent nose wheel shimmy. (sure makes steering
>> tougher - especially on take off)
>>
>> Has anybody else had this problem? I am guessing there is a problem
in
>> that there is a new and improved mounting for these bushings.
>>
>> Do I also need to go ahead and plan to replace these with the new
>> bushings and plates that are shown in the latest on-line plans?
>>
>> Ronnie
>> 173 Elite RG
>>
>>
>>
>> (173 Elite RG).
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