Re: OT: Nitrogen filled tires

On Mon, 15 Oct 2007 20:46:20 -0700, ChairmanOfTheBored
<RUBored@xxxxxxxxxxxxxxx> wrote:

On Mon, 15 Oct 2007 19:07:30 -0700, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Mon, 15 Oct 2007 18:03:38 -0700, ChairmanOfTheBored
<RUBored@xxxxxxxxxxxxxxx> wrote:

On Mon, 15 Oct 2007 08:57:49 -0700, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

I did some math in my head last night, to lull myself to sleep.

Imagine a reasonable-mass metal ring parallel to the wheel, half the
diameter of the tire, connected by a disk or spokes to the pump shaft
at the center of the wheel, with the pump body fixed to the wheel.

Imagine a car accelerates to, say, 60 k/h and back to zero, maybe 20
times a day. One could get kilojoules of work per day at the pump
shaft, easily enough to keep a tire inflated. If you used a full-size
spinning wheel cover, the increased radius helps even more (squared,
even) and using air drag helps more yet, since that add a continuous
power source that increases greatly with speed.

Do the math... it's easy.


You STILL don't get it. When the car brakes, the spinner assembly you
are on about is ALSO decelerated. Near ZERO net energy.


Hey, it was patented in 1997!

http://www.google.com/patents?id=pAQbAAAAEBAJ&dq=5591281



What a DOG!

That thing weighs so damned much, even the tire makers will void their
mileage warranties on cars that use it!

Then, there's that damned unsprung weight monster trolling in again.

Nobody in their right mind would put such a behemoth mass in the
wheels.

That's not the point we were discussing. We were discussing whether it
was possible.

John

.

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