[AT] OT truck tires/driveshaft?

[Dave Rotigel]

I'm sure we are all aware of the vibration that occurs as the landing gear on airlines is lowered in preparation for landing. Is that vibration caused due to tire imbalance, driveshaft misalignment, or the fact that the front tires are filled with nitrogen while the rear tires are filled with only air? Or could this simply be a factor of the tires back in the shop being square?
	Dave

On May 19, 2014, at 6:17 PM, charlie hill wrote:

> Take that 1/5 of slightly and multiply it by the percentage of
> fuel used during the 25 seconds of take off roll to total fuel
> use during a flight and now we are really getting in the small weeds.
> I would assume low air pressure would actually help slow the plane
> during landing roll out so you could deduct that if you like.
> 
> If I were trying to promote nitrogen in the tires I'd say the oxygen in air
> degrades the rubber but you can't prove that beyond theory either.
> 
> Charlie
> 
> -----Original Message----- 
> From: Stephen Offiler
> Sent: Monday, May 19, 2014 4:38 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] OT truck tires/driveshaft?
> 
> Ah-HA!  Gotcha.  Heavy aircraft vs. all aircraft; that distinction was
> throwing me.  Thanks for clearing that up.
> 
> Thinking about it.. this doesn't really change the point.  One can still
> say THE reason nitrogen is required in aircraft (in those cases where
> nitrogen is required at all) is due to the risk of explosion if oxygen were
> present.  It's not a matter of pressure "stability" at temperature
> extremes.  Or corrosion.  Or anything else the advertising churns out.
> 
> Mileage saving!  Good one.  Called on the carpet, they'd cite the diffusion
> rate of N2 vs regular air.  N2 is a slightly larger molecule and diffuses
> thru rubber slightly more slowly than O2.  Note "slightly" and note that
> regular air is nearly 80% N2 in the first place, so it's only about 20% (I
> am using round numbers), that is, the O2 component of regular air, that
> diffuses slightly more rapidly .  What would you call a rate that is 1/5 of
> "slightly"?  Maybe, VERY slightly?  To see a fuel economy difference that
> was large enough to actually measure in the real world, you'd have to let
> diffusion take place for a period of years.
> 
> SO
> 
> 
> 
> On Mon, May 19, 2014 at 2:49 PM, Ron Cook <ron at lakeport-1.com> wrote:
> 
>> I understand what you are saying and I agree.  I am just pointing out
>> that it is "the reason" for the heavy aircraft, not all aircraft.  All
>> my tires including the ones on my airplanes are filled with air and are
>> legal and I am happy.  We do use nitrogen where dry is a good idea, such
>> as airing up struts, etc.
>> A local tire store advertises heavily that they only fill your tires
>> with mileage saving nitrogen.  I consider it all advertising BS. But
>> many people swear by it.  I am also not all that convinced they use all
>> nitrogen at all.  I don't do business with that place.
>> 
>> Ron Cook
>> Salix, IA
>> 
>> 
>> On 5/19/2014 9:19 AM, Stephen Offiler wrote:
>>> Just saying... the stated reason in the AD is *the* reason that explains
>>> nitrogen in aircraft.  There's a lot of misleading information out there
>>> that tries to suggest otherwise...referring primarly to the advertising
>> and
>>> marketing efforts of those who manufacture nitrogen machines for filling
>>> automotive tires.
>>> 
>>> SO
>>> 
>>> 
>>> 
>>> 
>> 
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