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#211939 - 01/04/2004 16:38 horsepower ?
thinfourth2
Pooh-Bah

Registered: 13/04/2001
Posts: 1742
Loc: The land of the pale blue peop...
Seeing that a horse is pretty heavy and can move quite quickly how much horsepower does a hosre develop as it must be more then 1hp
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#211940 - 01/04/2004 16:41 Re: horsepower ? [Re: thinfourth2]
CrackersMcCheese
pooh-bah

Registered: 14/01/2002
Posts: 2489
A horse develops one horsepower. It can't make more horsepower than one horse - that wouldn't make sense as it would be more than one horsepower and then it wouldn't be a horsepower. Uh?

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#211941 - 01/04/2004 16:44 Re: horsepower ? [Re: thinfourth2]
peter
carpal tunnel

Registered: 13/07/2000
Posts: 4180
Loc: Cambridge, England
Seeing that a horse is pretty heavy and can move quite quickly how much horsepower does a hosre develop as it must be more then 1hp
But the heavy ones aren't quick, and the quick ones aren't heavy. James Watt did the original experiments, and while I can believe horses are a bit fitter these days what with growth hormones and so on, the original calibration was against one genuine horse. He harnessed it to a rope, passed the rope over a pulley down into a shaft, tied weights to the end of the rope, and timed how quickly the horse could lift them: 330 foot-pounds per second is what he came up with (i.e. 10lb at 33ft/sec, or 33lb at 10ft/sec). In modern units it's about 750 newton-metres per second, that's to say 750W.

Peter

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#211942 - 01/04/2004 16:57 Re: horsepower ? [Re: peter]
lastdan
enthusiast

Registered: 31/05/2002
Posts: 352
Loc: santa cruz,ca
what about a pony?

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#211943 - 01/04/2004 17:02 Re: horsepower ? [Re: lastdan]
peter
carpal tunnel

Registered: 13/07/2000
Posts: 4180
Loc: Cambridge, England
what about a pony?
Twenty-five pounds. Obviously.

Peter

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#211944 - 01/04/2004 17:33 Re: horsepower ? [Re: peter]
genixia
Carpal Tunnel

Registered: 08/02/2002
Posts: 3411
Here is a man who amongst many other engineering achievements gave the World a popular and usable unit of measurement.

Oh the irony.
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#211945 - 01/04/2004 21:30 Re: horsepower ? [Re: peter]
tanstaafl.
carpal tunnel

Registered: 08/07/1999
Posts: 5546
Loc: Ajijic, Mexico
330 foot-pounds per second is what he came up with

I am pretty sure that it was 550 foot-pounds per second, not 330.

Gawd, what kind of a group are that would know this kind of stuff? Stuff like it takes 80 calories per gram to change ice at 0 degrees C to water; and one calorie per gram to raise the temperature of the water one degree; and 540 calories per gram to turn the water at 100 degrees C into steam.

tanstaafl.
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#211946 - 02/04/2004 02:45 Re: horsepower ? [Re: tanstaafl.]
peter
carpal tunnel

Registered: 13/07/2000
Posts: 4180
Loc: Cambridge, England
I am pretty sure that it was 550 foot-pounds per second, not 330.
Of course you're right, I had threes in my head because it's 33000 foot-pounds per minute. That sounds better.

Peter

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#211947 - 02/04/2004 02:57 Re: horsepower ? [Re: thinfourth2]
julf
veteran

Registered: 01/10/2001
Posts: 1307
Loc: Amsterdam, The Netherlands
Seeing that a horse is pretty heavy and can move quite quickly how much horsepower does a hosre develop as it must be more then 1hp

As Peter described, the "1 hp" measure was based on the ability of the horse to do "external" work (pull something), not on how much power it generated while moving at high speed. A horse can develop much more than 1 HP when moving at high speed, but it can't sustain it for long.

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#211948 - 02/04/2004 07:25 Re: horsepower ? [Re: julf]
furtive
old hand

Registered: 14/08/2001
Posts: 886
Loc: London, UK
It's all torque anyway.
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#211949 - 02/04/2004 10:27 Re: horsepower ? [Re: furtive]
julf
veteran

Registered: 01/10/2001
Posts: 1307
Loc: Amsterdam, The Netherlands
It's all torque anyway

As the owner of 2 V8's I have to agree

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#211950 - 02/04/2004 13:32 Re: horsepower ? [Re: tanstaafl.]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
Stuff like it takes 80 calories per gram to change ...
Yeah, but are those calories or Calories?

1 Calorie in calories
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#211951 - 03/04/2004 12:48 Re: horsepower ? [Re: wfaulk]
tanstaafl.
carpal tunnel

Registered: 08/07/1999
Posts: 5546
Loc: Ajijic, Mexico
Yeah, but are those calories or Calories?


Aaaarrggh! You caught me!

That'll teach me not to try and show off.

tanstaafl.
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"There Ain't No Such Thing As A Free Lunch"

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#211952 - 03/04/2004 12:56 Re: horsepower ? [Re: tanstaafl.]
pgrzelak
carpal tunnel

Registered: 15/08/2000
Posts: 4859
Loc: New Jersey, USA
<nostalgia>

Ah, this brings me back to the days in my materials lab, where we measured energy by using bomb calorimeters, thermocouples and ice...

</nostalgia>

"As you can see from the blue flame, this was a particularly tasty donut..."
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