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1 horsepower, really the power of a horse? - 9/3/2007 4:08:18 PM   
Cambo



Posts: 1516
Joined: 6/20/2005
From: Phoenix, AZ, USA
Status: offline 		Hi everyone

For the longest time I thaught that "1 horspower" was exactly what they said, the power of 1 horse. But now i am not so sure. Just recently i saw something on the Discovery Channel that the human body can reach 4 horsepower. What? I am in no way near the power of one horse and now that i think of it I don't think my st40 has the power of a real horse either.

Any thaughts?

< Message edited by Cambo -- 9/3/2007 9:56:03 PM >
       Post #: 1

RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:32:59 PM   
Charley


 

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Joined: 12/5/2001
From: Kerrville, TX, USA
Status: offline
quote:

ORIGINAL: Cambo

Hi everyone

For the longest time I thaught that "1 horspower" was exactly what they said, the power of 1 horse. But know i am not so sure. Just recently i saw something on the Discovery Channel that the human body can reach 4 horsepower. What? I am in no way near the power of one horse and know that i think of it I don't think my st40 has the power of a real horse either.

Any thaughts?




1 Horsepower = The force required to raise 33,000 pounds at the rate of one foot per minute.

CR

< Message edited by blw -- 9/3/2007 4:36:02 PM >

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:47:19 PM   
daveopam



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Joined: 10/10/2002
From: ELK CITY, OK, USA
Status: offline 		Are you sure about the 33,000 lbs? I though it was much lower.

David

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:52:18 PM   
NikolayTT


 

Posts: 575
Joined: 9/29/2002
From: Tampere, FINLAND
Status: offline 		something more easy to measure:
1bhp = 750 Watts is something agreed long time ago,
maybe that time the horses were smaller

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:54:32 PM   
Charley


 

Posts: 981
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From: Kerrville, TX, USA
Status: offline
quote:

ORIGINAL: daveopam

Are you sure about the 33,000 lbs? I though it was much lower.

David


Yup, I looked it up.

Hay mod, what's up with you?

CR

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:57:11 PM   
NikolayTT


 

Posts: 575
Joined: 9/29/2002
From: Tampere, FINLAND
Status: offline 		Oh yes, something also easy to measure: - if you have at home or at the gym-hall
an Ergometter (home-bike which never moves) then if you set effort of 250 Watts
i.e. 1/3 of a Horse Power, then you can see how much your force is worth of.
Would be nice to have chance to try such ergometer with 750 Watts but I
have not seen them in a regular gym; maybe for Macho-Gyms there have
somehing like that.

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 4:57:37 PM   
Charley


 

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From: Kerrville, TX, USA
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quote:

ORIGINAL: NikolayTT

something more easy to measure:
1bhp = 750 Watts is something agreed long time ago,
maybe that time the horses were smaller

AIR, its 746 Watts. I often wondered how James Watt tested this between his engine and his horse(s).

CR

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 5:06:38 PM   
NikolayTT


 

Posts: 575
Joined: 9/29/2002
From: Tampere, FINLAND
Status: offline 		I think Mr. Watt might have been involved in a "Political" Debate with Sales & Marketing Dpt of How Many horses one
should sale in otder to get his Machine and there comes to coefficient from; otherwise measuring it on a real horse
might prove to be a hazard - how about if the Horse likes to kick-back

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 5:07:43 PM   
Heliko



Posts: 591
Joined: 1/16/2007
From: Long Island, NY, USA
Status: offline 		I took this exert from Wikipedia:


Mechanical horsepower

The term "horsepower" was coined by the engineer James Watt (1736 to 1819) in 1782 while working on improving the performance of steam engines. This occurred while using a mine pony to lift coal out of a coal mine. He conceived the idea of defining the power exerted by these animals to accomplish this work. He found that, on the average, a mine horse could pull (lift by means of a pulley) 22,000 foot-pounds per minute. Rather than call this "pony" power, he increased these test results by 50 percent, and called it horsepower i.e. 33,000 foot-pounds of work per minute.

Under this system, then, one horsepower is defined as:

1 hp = 33,000 ft-lbs/min (550 ft-lbs/sec) (745.69987158227022 watts)

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 6:10:00 PM   
Hughes500E



Posts: 1069
Joined: 11/23/2002
From: Armstrong, BC, CANADA
Status: offline 		I don't think my engines can lift 60 to 90 000 pounds

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 6:44:31 PM   
daven



Posts: 6894
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		Nelson .40 LS Q40 motor at roughly 17 oz, turning a 7.5 pitch prop at over 25,000 rpm.

Can you say 3 hp

Priceless!

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 8:00:48 PM   
jaka


 

Posts: 4524
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
1 horse power= lifting 75kg , 1m, in one second.

Try it...
Don't think anyone will make it...

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 8:25:52 PM   
Red B.


 

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From: Jonkoping, SWEDEN
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quote:

ORIGINAL: jaka
1 horse power= lifting 75kg , 1m, in one second.


Your definition is for the metric horsepower = 735.5 W (approx)
The traditional mechanical horsepower is 33,000 ft-lbf/min = 745.7 W (approx.)
For electrical motors the electrical horsepower = 746 W (exactly).

It is probably a modern myth that Watt himself performed experiments to determine the power output of mining ponies. Instead he probably sought the advice of experienced millwrights, men whose profession was designing and building factories. Among Watt's surviving papers are his “Blotting and Calculation Book 1782 & 1783.” In an entry made in August 1782 one can read “Mr. Wriggley, millwright, says a mill-horse walks in 24 feet diar and makes 2½ turns per minute....say at the rate of 180lb p. horse.” This is equal to 32,400 ft-lbf/min, but in the 1783 Watt himself has rounded this figure to 33,000 ft-lbf/min, probably to simplify calculations.

< Message edited by Red B. -- 9/3/2007 8:39:36 PM >

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 9:55:08 PM   
longdan



Posts: 495
Joined: 10/18/2006
From: Auckland, NEW ZEALAND
Status: offline 		Some may be interested to know that a manual labourer (person) is continuously rated at 1/8 HP. This used to be a measure used in comparing machines to people, and weather it was economic to replace a person with a machne. In these politically correct times, rating people by their work output probably isn't the done thing.

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RE: 1 horsepower, really the power of a horse? - 9/3/2007 11:42:59 PM   
donkey doctor



Posts: 1197
Joined: 12/1/2002
From: Lake Cowichan, BC, CANADA
Status: offline 		Hello; Perhaps a more useable measurement might be the amount of thrust an engine can maintain. I noticed that some electric brushless engines are being advertised with a thrust rating in lbs. or in kilograms. That is a more useable measurement for me as I know how heavy my planes are. I have a hard time linking "horsepower" to our model airplane engines. The mental image just isn't there.

I liked that wikipedia James Watt story; They had to have something to compare it to, just like we do. We don't have horses any more, but we still ahve thrust.

(in reply to longdan)
       Post #: 15

RE: 1 horsepower, really the power of a horse? - 9/4/2007 1:32:41 AM