REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication

Tue Sep 6 16:37:53 CDT 2011

I really have no idea how tacky the grease should be, so it's a shot in 
the dark.  However, yup, that's a much better price.
Are you taxiing yet?

The heat here has finally broken, but I've got my weekends all spoken 
for until October.  I think I'm 8 working days away from doing taxi 
tests again.

I'm taking a vacation to Germany.  I hope the fires don't burn down my 
house before I get back.  Since Saturday, I've been very nervous about 
all these fires popping up all over the place.  My house backs up to a 
wooded greenbelt, and it would go up in flames in an instant.

On 9/6/2011 4:25 PM, nmflyer1 at aol.com wrote:
> Interesting information Brian.  Definately something that I was not 
> aware of.
> Do you think /this /would be worth a test run?: 
> http://www.amazon.com/Lubricant-Grease-Nyogel-2oz-Tube/dp/B005KLCXDQ/ref=sr_1_1?ie=UTF8&qid=1315344168&sr=8-1 
> <http://www.amazon.com/Lubricant-Grease-Nyogel-2oz-Tube/dp/B005KLCXDQ/ref=sr_1_1?ie=UTF8&qid=1315344168&sr=8-1>
> Quite a bit less spensive for a test.
> Kurt
>
>
>
> -----Original Message-----
> From: Brian Michalk <michalk at awpi.com>
> To: Brett Ferrell <reflector at velocityxl.com>; Velocity Aircraft Owners 
> and Builders list <reflector at tvbf.org>
> Sent: Tue, Sep 6, 2011 10:14 am
> Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication
>
> Perhaps a damping grease would work better?
> A damping grease is a dilatant, or shear thickening lubricant.  It has 
> the property of exhibiting higher viscosity when under shear.
>
> Almost all lubricants are the opposite.  Greases in particular are 
> thixotropic.  They become solid at rest, and liquids under shear, 
> which is the opposite of what we need.
>
> I would like to try this one day.  Here is a link to a kit containing 
> various samples:
> http://www.lubekits.com/?load=grease
>
> There may be other sources, perhaps motorcycle fork oil, chain grease, 
> shock absorber oil or limited slip differential oil could be dilatant 
> greases.
>
>
> On 9/6/2011 9:13 AM, Brett Ferrell wrote:
>> We replaced the phenolic with the nylon, so YES, we still use the 
>> standard belleville washers, grease, and check them before each 
>> flight, but we find that we can tighten the nut tighter and still 
>> maintain pretty easy steering.  We also keep the tension higher since 
>> Scott Swing visited, as he thought our nose wheel was 'too loose' at 
>> what we believed was the prescibed tension.  I think the manual calls 
>> for 15 pounds break-out, and with our test rig what felt right to 
>> Scott measured about 25.
>>
>> We have the Mishler lock, but we do not use it.  It's probably fine, 
>> but we heard a couple of stories that worried us, one person tossed 
>> their nose pant and someone else's wheel got locked sideways and they 
>> had some trouble controlling the plane with the pant cocked to one 
>> side.  Scott S really likes the lock, though (or at least did) and 
>> encouraged us to use it.  He may favor the dampener now, I'm not sure.
>>
>> We've been flying with the nylon nut for over a year and have really 
>> liked it.  All of our "practical" flying has been done with it, but 
>> I'd have to look at a log to say for sure how many hours.  It's 
>> probably in the 30-40, but we have a ton of landings as it seems 
>> we're always testing something (pants, vgs, props, whatever).  We 
>> certainly don't have years and years on ours, but so far we have been 
>> happy.
>>
>> Brett
>>
>> 	-------Original Message-------
>> From: Scott Derrick
>> To: Brett Ferrell , Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication
>> Sent: 06 Sep '11 08:47
>>
>> So Brett,
>>
>> No Belleville washers at all? Just a couple of thick nylon washers?
>>
>> How many hours/landings would you estimate?
>>
>> Do you still check the nose turning tension as part of preflight?
>>
>> Scott
>>
>> -------- Original Message --------
>> Subject: Re: REFLECTOR: Violent Shimmy Cause = Light Gun Oil Lubrication
>> From: Brett Ferrell
>> To: reflector
>> Date: 09/06/2011 05:35 AM
>>> I would definitely use the grease, but we've been flying the nylon 
>>> nut solution for awhile and really like it.  It keeps a relatively 
>>> usable break-out force but still has enough friction to damp out 
>>> shimmy.  We think the airplane stays very steerable with this setup.
>>> http://www.velocityxl.com/wiki/index.php?title=Nylon_Belleville_Anti-Shimmy
>>>
>>> Brett
>>>
>>>
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>>
>> -- 
>> Great minds discuss ideas; Average minds discuss events; Small minds discuss people.
>> Eleanor Roosevelt
>>
>>
>>
>>
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