Winter tyres (or is that tires)
Oct 11th 2012, 1:31 am
#91
ModerĪ±tor Emeritus
Joined: Sep 2003
Location: Upstate South Carolina
Posts: 30,771
Re: Winter tyres (or is that tires)
Look, I went to pains to point out that engineering is more lax than real science.
1) nothing diffuses through a tyre, either way. If you lose pressure you have a leak.
2) dry air is just as dry as dry nitrogen and as pointed our air is 80% nitrogen anyway: and as further pointed out a bit of moisture plays no role at all. What could it do? Any water vapour present will not materially affect the pressure v temperature relation since the maximum water content (New Orleans in July) is ~3% and the B coefficient for H2O (explained in my earlier post) is only 30% higher than for air.
3) I've no idea if aircraft are filled with nitrogen very often. Every one of the thousands of flights I've taken were filled with air.
1) nothing diffuses through a tyre, either way. If you lose pressure you have a leak.
2) dry air is just as dry as dry nitrogen and as pointed our air is 80% nitrogen anyway: and as further pointed out a bit of moisture plays no role at all. What could it do? Any water vapour present will not materially affect the pressure v temperature relation since the maximum water content (New Orleans in July) is ~3% and the B coefficient for H2O (explained in my earlier post) is only 30% higher than for air.
3) I've no idea if aircraft are filled with nitrogen very often. Every one of the thousands of flights I've taken were filled with air.
The amount of moisture in air filled tires is not a direct correlation to the of humidity in the air, its a result of that small amount of humidity collecting over time in the tanks or lines and then getting shot out in one burp from time to time. Ive read of tire techs finding as much as a quart of water inside a car tire when changing them, thats a bit more that 3%!
In the case of aircraft arguments applying to car tires it very much a red herring anyway as the real danger in aircraft is water freezing at altitude causing the tire to be out of balance when the rubber hits the runway, and aircraft tires operate at much higher pressures where they can lose 5% pressure day in normal usage.
Its not that Im disagreeing about Nitrogen in car tires being a con, but there are reasons for its use in aircraft, they just dont apply to cars.
Last edited by iaink; Oct 11th 2012 at 1:36 am.
Oct 11th 2012, 1:44 am
#92
Banned
Joined: Dec 2010
Location: Durham Region Extension
Posts: 3,342
Re: Winter tyres (or is that tires)
Oh...Canada also has a female astronuat from Quebec
Oct 11th 2012, 1:48 am
#93
Born again atheist
Joined: Jul 2005
Location: Europe (to be specified).
Posts: 30,259
Oct 11th 2012, 1:52 am
#94
Slob
Joined: Sep 2009
Location: Ottineau
Posts: 6,342
Re: Winter tyres (or is that tires)
The bird who landed my 747 this morning could well have been a fighter pilot. It hit the ground like a Stuka that had just been shot down.
Oct 11th 2012, 1:57 am
#95
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Location: Upstate South Carolina
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Oct 11th 2012, 2:13 am
#96
Joined: Feb 2006
Location: Red Deer, Alberta
Posts: 10,614
Re: Winter tyres (or is that tires)
I think my husband is wishing he had snow tyres today - rear wheel drive mustang gt
It's not like we haven't got something more suitable for the winter - if only he would fix it/them
It's not like we haven't got something more suitable for the winter - if only he would fix it/them
Oct 11th 2012, 2:17 am
#97
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Location: Upstate South Carolina
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Oct 11th 2012, 2:51 am
#99
Joined: Feb 2006
Location: Red Deer, Alberta
Posts: 10,614
Re: Winter tyres (or is that tires)
Yes, we unfortunately do, doesn't bode well for OH dealing with this years winter that's for sure. It's supposed to warm up by tomorrow
We had a slight dusting last week, but today we can definitely say, we've got snow. It's the earliest we've had it since we've lived here.
We had a slight dusting last week, but today we can definitely say, we've got snow. It's the earliest we've had it since we've lived here.
Oct 11th 2012, 3:05 am
#101
Up Your Kilt
Joined: Mar 2012
Location: 1313 Mockingbird Lane, Mockingbird Heights
Posts: 1,621
Re: Winter tyres (or is that tires)
+1 on the brake lightly and early
Oct 11th 2012, 3:33 am
#102
Joined: Feb 2006
Location: Red Deer, Alberta
Posts: 10,614
Re: Winter tyres (or is that tires)
Same here in Alberta, the ones that have got the super chips in and think they can see through blizzard conditions, are the ones that end up facing the wrong way waiting for the tow ban to be lifted.
