Why nitrogen?

Peter Dohm wrote:
The only difference that would make nitrogen seen really beneficial to me
would be in the case of an aircraft which is kept hangared and seldom
operated. Then, if the tire threads last a number of years, and the tires
are sheltered from UV radiation, the inert nature of the nitrogen could be
usefull.


In theory, perhaps. In practice, tires oxidize from the outside as well as
the inside. I've noticed that every time I've bought expensive, long-life
tires, they have to be chucked because the sidewalls are rotting, even though
the tread is still good. It's not just air, but pollutants (particularly in
the cities). Ozone, a common urban pollutant, is particularly bad for tires.

John Galban=====N4BQ (PA28-180)

--
Message posted via AviationKB.com
http://www.aviationkb.com/Uwe/Forums...ation/200809/1

"JGalban via AviationKB.com" u32749@uwe wrote in message
news:8a4950eac1beb@uwe...
Peter Dohm wrote:
The only difference that would make nitrogen seen really beneficial to me
would be in the case of an aircraft which is kept hangared and seldom
operated. Then, if the tire threads last a number of years, and the tires
are sheltered from UV radiation, the inert nature of the nitrogen could be
usefull.


In theory, perhaps. In practice, tires oxidize from the outside as well
as
the inside. I've noticed that every time I've bought expensive, long-life
tires, they have to be chucked because the sidewalls are rotting, even
though
the tread is still good. It's not just air, but pollutants (particularly
in
the cities). Ozone, a common urban pollutant, is particularly bad for
tires.

John Galban=====N4BQ (PA28-180)

Ordinarily, I would just let this slide; but since the greenies have decided
that CO2 (which is nature's means of recycling oxygen) and O3 (which is
nature's cleanser of the atmosphere) are "pollutants" according to the
strange reasoning of their adled brains, I feel compelled to point out that
I suggested that the aircraft would be sheltered in a hangar--which would
protect the outsides of the tires from part of the damage. They still won't
last until the treads wear out, but it will help.

Peter

"Peter Dohm" wrote in
:

"JGalban via AviationKB.com" u32749@uwe wrote in message
news:8a4950eac1beb@uwe...
Peter Dohm wrote:
The only difference that would make nitrogen seen really beneficial
to me would be in the case of an aircraft which is kept hangared and
seldom operated. Then, if the tire threads last a number of years,
and the tires are sheltered from UV radiation, the inert nature of
the nitrogen could be usefull.


In theory, perhaps. In practice, tires oxidize from the outside as
well
as
the inside. I've noticed that every time I've bought expensive,
long-life tires, they have to be chucked because the sidewalls are
rotting, even though
the tread is still good. It's not just air, but pollutants
(particularly in
the cities). Ozone, a common urban pollutant, is particularly bad
for tires.

John Galban=====N4BQ (PA28-180)

Ordinarily, I would just let this slide; but since the greenies have
decided that CO2 (which is nature's means of recycling oxygen) and O3
(which is nature's cleanser of the atmosphere) are "pollutants"
according to the strange reasoning of their adled brains,



Here is an explanation for you.


If you find it too difficult to understand I'll have a look around for
the Litle Golden Book of Wonder version for you.



http://earthguide.ucsd.edu/globalcha...arming/03.html



Bertie

"Bertie the Bunyip" wrote in message
...
"Peter Dohm" wrote in
:

"JGalban via AviationKB.com" u32749@uwe wrote in message
news:8a4950eac1beb@uwe...
Peter Dohm wrote:
The only difference that would make nitrogen seen really beneficial
to me would be in the case of an aircraft which is kept hangared and
seldom operated. Then, if the tire threads last a number of years,
and the tires are sheltered from UV radiation, the inert nature of
the nitrogen could be usefull.


In theory, perhaps. In practice, tires oxidize from the outside as
well
as
the inside. I've noticed that every time I've bought expensive,
long-life tires, they have to be chucked because the sidewalls are
rotting, even though
the tread is still good. It's not just air, but pollutants
(particularly in
the cities). Ozone, a common urban pollutant, is particularly bad
for tires.

John Galban=====N4BQ (PA28-180)

Ordinarily, I would just let this slide; but since the greenies have
decided that CO2 (which is nature's means of recycling oxygen) and O3
(which is nature's cleanser of the atmosphere) are "pollutants"
according to the strange reasoning of their adled brains,



Here is an explanation for you.


If you find it too difficult to understand I'll have a look around for
the Litle Golden Book of Wonder version for you.



http://earthguide.ucsd.edu/globalcha...arming/03.html



Bertie

You are too kind!

BTW, it did make a good case for the expansion of nuclear power--which I
have long favored.

Peter

on 9/16/2008 6:31 PM Peter Dohm said the following:
Ordinarily, I would just let this slide; but since the greenies have decided
that CO2 (which is nature's means of recycling oxygen) and O3 (which is
nature's cleanser of the atmosphere) are "pollutants" according to the
strange reasoning of their adled brains, I feel compelled to point out that
I suggested that the aircraft would be sheltered in a hangar--which would
protect the outsides of the tires from part of the damage. They still won't
last until the treads wear out, but it will help.

You're suggesting hangars are so airtight that CO2 and O3 are somehow
sealed away from the tires inside? The effect of O3 on tires is not
through increased UV or global warming. It's direct chemical interaction
with the polymer chains in the rubber compounds.

"Rich Ahrens" wrote in message
. net...
on 9/16/2008 6:31 PM Peter Dohm said the following:
Ordinarily, I would just let this slide; but since the greenies have
decided that CO2 (which is nature's means of recycling oxygen) and O3
(which is nature's cleanser of the atmosphere) are "pollutants" according
to the strange reasoning of their adled brains, I feel compelled to point
out that I suggested that the aircraft would be sheltered in a
hangar--which would protect the outsides of the tires from part of the
damage. They still won't last until the treads wear out, but it will
help.

You're suggesting hangars are so airtight that CO2 and O3 are somehow
sealed away from the tires inside? The effect of O3 on tires is not
through increased UV or global warming. It's direct chemical interaction
with the polymer chains in the rubber compounds.

Not at all. However, UV is supposedly a player in rubber deterioration.

There is not much you can do about O3, you'll just have to live with it.

"Viperdoc" wrote in
:

The thread on brakes raised a question from the past- why nitrogen in
the tires of big jets and heavies? Air is around 78% nitrogen anyway,
and the coefficient of expansion of the remaining 20% that's oxygen
can't make that much difference in volume.

Why not just use dry air? I couldn't imagine that dry air or dry
nitrogen could make that much difference in corrosion, either.

I seem to recall someone giving me the rationale for this a long time
ago, but also seem to remember thinking it didn't make that much sense
at the time.




Well, the greasemonkies say it preserves the rubber. Having said that we go
through them pretty quick and even considering retreads there wouldn't
be years of exposure or anything..
Wheel fires may be another good reason...


bertie

"Bertie the Bunyip" wrote in message
...
"Viperdoc" wrote in
:

The thread on brakes raised a question from the past- why nitrogen in
the tires of big jets and heavies? Air is around 78% nitrogen anyway,
and the coefficient of expansion of the remaining 20% that's oxygen
can't make that much difference in volume.

Why not just use dry air? I couldn't imagine that dry air or dry
nitrogen could make that much difference in corrosion, either.

I seem to recall someone giving me the rationale for this a long time
ago, but also seem to remember thinking it didn't make that much sense
at the time.




Well, the greasemonkies say it preserves the rubber. Having said that we
go
through them pretty quick and even considering retreads there wouldn't
be years of exposure or anything..
Wheel fires may be another good reason...


bertie


Right, they are called Napoleon tires. You heard of "Napoleon Blown Apart"
haven't you. :-)

--
Regards, Bob F.

"Bob F." wrote in
:

"Bertie the Bunyip" wrote in message
...
"Viperdoc" wrote in
:

The thread on brakes raised a question from the past- why nitrogen
in the tires of big jets and heavies? Air is around 78% nitrogen
anyway, and the coefficient of expansion of the remaining 20% that's
oxygen can't make that much difference in volume.

Why not just use dry air? I couldn't imagine that dry air or dry
nitrogen could make that much difference in corrosion, either.

I seem to recall someone giving me the rationale for this a long
time ago, but also seem to remember thinking it didn't make that
much sense at the time.




Well, the greasemonkies say it preserves the rubber. Having said that
we go
through them pretty quick and even considering retreads there
wouldn't be years of exposure or anything..
Wheel fires may be another good reason...


bertie


Right, they are called Napoleon tires. You heard of "Napoleon Blown
Apart" haven't you. :-)


groan!


A guy i used to work with witnessed the aftermath of someone trying to
fill a 707 nosewheel wiht an incorrect type reduction on the bottle. The
guy was pretty much vaporised. My friend spent months as a witness in
the subsequent lawsuit.

Bertie

"Bertie the Bunyip" wrote in message
...
"Bob F." wrote in
:

"Bertie the Bunyip" wrote in message
...
"Viperdoc" wrote in
:

The thread on brakes raised a question from the past- why nitrogen
in the tires of big jets and heavies? Air is around 78% nitrogen
anyway, and the coefficient of expansion of the remaining 20% that's
oxygen can't make that much difference in volume.

Why not just use dry air? I couldn't imagine that dry air or dry
nitrogen could make that much difference in corrosion, either.

I seem to recall someone giving me the rationale for this a long
time ago, but also seem to remember thinking it didn't make that
much sense at the time.




Well, the greasemonkies say it preserves the rubber. Having said that
we go
through them pretty quick and even considering retreads there
wouldn't be years of exposure or anything..
Wheel fires may be another good reason...


bertie


Right, they are called Napoleon tires. You heard of "Napoleon Blown
Apart" haven't you. :-)


groan!


A guy i used to work with witnessed the aftermath of someone trying to
fill a 707 nosewheel wiht an incorrect type reduction on the bottle. The
guy was pretty much vaporised. My friend spent months as a witness in
the subsequent lawsuit.

Bertie

You're a cross posting dumb ass.