[AT] OT truck tires/driveshaft?

[Dave Rotigel]

Thanks Dean! I have wondered for years what caused that vibration.
	Dave

On May 19, 2014, at 9:47 PM, Dean Vinson wrote:

> Dave,  the vibration you mentioned is a result of airplanes having narrow
> front ends instead of wide fronts.   The vibration stems from the autopilot
> making rapid corrections to keep the plane from spontaneously tipping over.
> 
> Dean
> 
> 
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dave Rotigel
> Sent: Monday, May 19, 2014 7:29 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] OT truck tires/driveshaft?
> 
> 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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