Date: 6/11/2026 22:31:17
From: Kingy
ID: 2446242
Subject: re: Spiny's thread of occasional interest

The Rev Dodgson said:


ChrispenEvan said:

Kingy said:

Holy Carp. The tires!

At 500kmh the top of the tire is doing over 1000kmh and the bottom is stationary. A piece of the rubber that touches the road rotates around the axle and goes from zero to 1000kmh to zero once every(approx) 2m. At that speed it is doing the 0-1000-0kmh about 70 times per second!

That’s a very special type of rubber. Usually at that speed you need spun aluminium wheels.

only true relative to the road.

But relative to the axle it is accelerating from -500 kmh to + 500 kmh and back again about 70 times a second.

If I have my numbers right (big if), that’s about 3900g.

And…

The driver is trusting that the engineer has got his sums right (big if).

And that the tire manufacturer has followed the specifications.

And that the road is clean.

And there are no random camels wandering around.

And that the battery manufacturer hasn’t cut corners with cheaper ingredients.

And etc. etc.

I’d like to have a go in that car, but not sure I’d be confident enough to floor it to 500kmh.

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