On 21 May 2005 12:55:38 GMT, the inscrutable Ignoramus14511
spake:

On Sat, 21 May 2005 04:49:06 +0000 (UTC), Cydrome Leader wrote:
Ignoramus32374 wrote:
I'd say the ouside of a tire might make a good surface to run
directly on a motor shaft of some sort, letting you skip all the
gears and nonsense. Why does this need to complicated?

Good question. In my opinion, 60 rpm is too much for a used tire.

Let's see, 60rpm too much? Take your 15" tire (Mine are 28" tall.)
1 mile is 5,280' or 63,360". One rev is 88", 60mph is 1mpm, so
dividing 63,360 by 88 gives us 720rpm at 60mph. I think a used tire
(even a 12-incher) can take that beating, Iggy.

But 60rpm would likely stick the rocks and all else to the drum, not
allowing any movement or tumbling. Speed probably has to be 30rpm or
less, lower on larger diameters due to centrifugal forces.

(Oops, I meant to say "centripetal forces." Sorry.

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