REFLECTOR: Nosewheel shimmy_1

Andrew Ellzey ajlz72756 at yahoo.com
Tue Jun 27 10:32:26 CDT 2006


Larry,

How old is your kit? My XLRG kit shipped Aug 05 has steel washers and not 
fiber washers. I think you have a good idea and I will probably try two thin 
Teflon washers under my steel washers next to the nose wheel fork. This 
would stack from the bottom up as "Nut, steel washer, Teflon washer, nose 
wheel fork, Teflon washer, steel washer,  bellville washers 3ea.as plans 
indicate." Or only one Teflon washer on the lower (nut) end might work 
better. I'm not at the Taxi stage, so someone might come up with something 
better before then.

Andy

----- Original Message ----- 
From: "Laurence Coen" <lwcoen at hotmail.com>
To: <amillin at sbcglobal.net>; "Velocity Aircraft Owners and Builders list" 
<reflector at tvbf.org>
Sent: Tuesday, June 27, 2006 9:33 AM
Subject: Re: REFLECTOR: Nosewheel shimmy_1


> I'm the Nylon washer guy.  It replaces the fiber washer, not the Bellville
> washers.  Initially it works great.  Easy to steer on the ground and no
> shimmy so far.  It will take time and a lot more landings to find out if
> this is a great idea or another flop.
>
> Larry Coen
> N136LC
> SE/RG Franklin/IVO
>
> ----- Original Message ----- 
> From: "Andy Millin" <amillin at sbcglobal.net>
> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
> Sent: Tuesday, June 27, 2006 8:20 AM
> Subject: REFLECTOR: Nosewheel shimmy_1
>
>
>> Sid,
>>
>> Could you resend your picture?  For some reason I didn't receive the
>> email.
>>
>> Thanks for doing the research.
>>
>> One of the builders had made a Nylon washer to replace the belville
>> arrangement.  I would like to see a picture of the Nylon solution.
>>
>> Sid, I like your style.  Asking this group to come up with possible modes
>> of
>> failure is like asking who wants free pie and chips.  :)
>>
>> I haven't seen the picture yet...
>>
>> -- You have a hard landing, maybe a few over time and it separates and
>> goes
>> through the prop
>>
>> From Rich Guerra's videos you can watch the nose gear touch down.
>> When it comes down "plop" it appears it would shake the dampener rather
>> violently.
>>
>> -- It bends the fork over time
>>
>> -- It gets caught in the door upon retraction or extension
>>
>> -- It costs more, weights more and adds complexity
>>
>> -- Possible balance issue combined with a looser nut lets it flip around
>> 180
>> -- gear is backwards when you try to retract or extend ... Possibly on
>> touch
>> down
>>
>> -- Attach point creates a stress riser in the main gear fork.  Over time
>> the
>> fork cracks
>>
>> Truth can be stranger than fiction.
>>
>> We will never know what the problems are if it isn't tried and the real
>> information gathered.  Thanks again for giving it your time and letting 
>> us
>> know what you find.
>>
>> On a related note:
>>
>> I had spoken with my brother, also a pilot as well as president of a
>> machining company.  Alex had mentioned a type of hydraulic dampener that
>> could be a solution.  My brother agreed this could be a solution and
>> pointed
>> me to a few websites to see "like" examples.
>>
>> He immediately had concerns about the cost, size, weight and durability
>> over
>> time.  His opinion was we could try it, but it would be expensive and had
>> a
>> high probability of being a less than perfect solution.  Not to mention
>> you
>> will be testing it on your $200K aircraft.
>>
>> This has been a longstanding issue for aircraft with castering nose
>> wheels.
>> Trying to find an elegant solution must not be easy.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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