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On Mon, May 14, 2007 at 12:18:54PM -0700, Vitaliy wrote:
> David VanHorn wrote:
> > FWIW, there never was a horse that could output one horsepower, so
> > creative marketing is NOT a new thing here.
> 
> Sorry David, you have it backwards.
> 
> James Watt was trying to avoid being accused of cheating, therefore his 
> definition of horsepower is actually 1.5 times greater than a "real" 
> horsepower (what a horse can pull). So what we call 100 hp nowadays, is 
> actually 150 hp if you measure in "real" horses.

And of course that's only your average horse, for a sustained period of
time. Peak exertion for a horse can easilly be 5 horsepower. Heck, the
difference in exertion in humans between working and working hard is
pretty big too, 100W resting, 500W for what most people would call
exercise and 2000W+ peaks for pro athletes. Which also means that the
usual refrain that 90% of you heat is lost through your head isn't true
the second you start moving...

- -- 
http://petertodd.ca
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