deflating tyres on planes

[Vincent Wilcox]

half_pint wrote:
> You could be right about the 220 psi, the space shuttle tyres are 340 psi.
>
> Anyhow if aircraft tires were inflated to 27psi, (as I thought reasonable)
> concorde might still be flying today!!
>
> I guess there is no profit in transporting lots of tires though!!
>

Wheres the "could be right?" It is right.

David mis-calculated the number of tyres on a 757 there are only 10,
there are 18 on a 747 however, probably the cause of the confusion. Lets
use Concorde as the example it also has 10 tyres and slightly higher
pressures and well you seem particularly fascinated by its explosion. So
revisiting Davids calculations.

10 tyres on Concorde and a take off weight of 185,020Kg. 18.5 tons per
tyre (again rear are higher). ~232psi per tyre. 232psi = 105Kg/SqIn =
171SqIn contact patch or 17Inchx10Inch. With 27psi per tyre =
12.2Kg/SqIn = ~1500SqIn.

So youre right I guess, the question is where would you stow ~90 tyres
or 10 earth mover size tyres on a supersonic jet? I suspect there must
have been a design/safety compromise somewhere along the line.

 

[half_pint]

"Vincent Wilcox" <[email protected]> wrote in message
news:[email protected]...
> half_pint wrote:
> > You could be right about the 220 psi, the space shuttle tyres are 340
psi.
> >
> > Anyhow if aircraft tires were inflated to 27psi, (as I thought
reasonable)
> > concorde might still be flying today!!
> >
> > I guess there is no profit in transporting lots of tires though!!
> >
>
> Wheres the "could be right?" It is right.

I didn't know the figure myself.

>
> David mis-calculated the number of tyres on a 757 there are only 10,
> there are 18 on a 747 however, probably the cause of the confusion. Lets
> use Concorde as the example it also has 10 tyres and slightly higher
> pressures and well you seem particularly fascinated by its explosion. So
> revisiting Davids calculations.
>
> 10 tyres on Concorde and a take off weight of 185,020Kg. 18.5 tons per
> tyre (again rear are higher). ~232psi per tyre. 232psi = 105Kg/SqIn =
> 171SqIn contact patch or 17Inchx10Inch. With 27psi per tyre =
> 12.2Kg/SqIn = ~1500SqIn.
>
> So youre right I guess, the question is where would you stow ~90 tyres
> or 10 earth mover size tyres on a supersonic jet? I suspect there must
> have been a design/safety compromise somewhere along the line.

Well I guess more tires means less passenger space
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