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Re: your mail

Hairy green toads from Mars made grant f lenahan say:

> > So, doubling the speed
> > makes a four-fold increase in drag, but doubling the drive-wheel count
> > cuts it by a factor of 16!
> 
> Careful with your wording.  Doubling the drive wheel count
> custs the _torque induced hysteresis_ by a factor of 16,
> maybe, but not the losses.  I'd guess that that type of
> loss is initially very small (but obviously grows quite
> quickly as you put down more torque per wheel).

Good catch. That's what I get for sending out quick mail when the
office christmas party awaits!

It is only the hysteresis component that is cut by 16. This is
initially small, but becomes much more signficant (dominant?)
at highway speeds.

I really have to dig that SA article out. It was about a year ago,
so it is probably about 14-16" down in my pile....

-- 

Andrew L. Duane (JOT-7)			duane@zk3.dec.com
Digital Equipment Corporation		(603)-881-1294
110 Spit Brook Road			http://www.zk3.dec.com/~duane
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Nashua, NH    03062-2698

Only my cat shares my opinions, and her subscription lapsed.