2001-03-12
>From the site: http://www.unc.edu/~rowlett/units/index.html
bhp
abbreviation for brake horsepower. The brake horsepower of an engine is the
effective power output, sometimes measured as the resistance the engine
provides to a brake attached to the output shaft. See horsepower.
horsepower (hp)
a unit of power representing the power exerted by a horse in pulling. The
horsepower was defined by James Watt (1736-1819), the inventor of the steam
engine, who determined after careful measurements that a horse is typically
capable of a power rate of 550 foot-pounds per second. This means that a
horse, harnessed to an appropriate machine, can lift 550 pounds at the rate
of 1 foot per second. Today the SI unit of power is named for Watt, and one
horsepower is equal to approximately 745.6999 watts. (Slightly different
values have been used in certain industries.) Outside the U.S., the English
word "horsepower" is often used to mean the metric horsepower, a slightly
smaller unit.
horsepower hour (hp hr)
a unit of work or energy equal to the work done at the rate of 1 horsepower
for 1 hour. The horsepower hour equals 1 980 000 foot pounds or
approximately 2.685 megajoules, 2545 Btu, 641.1 (large) Calories, or 745.7
watt hours.
metric horsepower
a unit of power, defined to be the power required to raise a mass of 75
kilograms at a velocity of 1 meter per second. This is approximately 735.499
watts or 0.986 32 horsepower. The unit is also known by its French name
cheval vapeur or its German name pferdestärke
John
Keiner ist hoffnungsloser versklavt als derjenige, der irrtümlich glaubt
frei zu sein.
There are none more hopelessly enslaved then those who falsely believe they
are free!
----- Original Message -----
From: "James R. Frysinger" <[EMAIL PROTECTED]>
To: "U.S. Metric Association" <[EMAIL PROTECTED]>
Sent: Tuesday, 2001-03-13 09:17
Subject: [USMA:11569] Re: What is bhp
> The term "bhp" refers to "braking horse power", which is also used in
> the U.S. I believe. As I recall, it refers to the ability of an engine
> to develop power under load. In all probability there is an industrial
> (SAE, ASTM, ASME ?) standard procedure to determine this value. Given
> the probalbe precision of the measurement, I would multiply this number
> by 3/4 to calculate power in kilowatts.
>
> After perusing some SAE pages I noticed that one has to be careful not
> to confuse this term with a similar term, "brake rating horsepower
> capability", which has to do with the capability of the braking system
> on a vehicle.
>
> There's a page that's kind of neat at
> http://members.home.net/rck/phor/06-Speed.html
> The author is obviously writing for amateur car enthusiasts and it is
> in ifp units (but he points out that things would be a lot simpler in
> metric!). If you can put up with the units involved, this is a neat
> discussion of the physics involved in overcoming drag.
>
> Apart from the above, I suggest that you type "braking horsepower" into
> the "open location" line of a browser and enjoy yourself while perusing
> the resulting search results.
>
> Jim
>
> On Tuesday 13 March 2001 0834, M R wrote:
> > Some countries like Britain, India, etc use the term
> > bhp to define the power of an automobile.
> > Can someone explain what is its equivalent in terms of
> > kilowatts.
> >
> > The last but one line in this webpage has reference to
> > bhp.
> > http://www.thetimes.co.uk/article/0,,2-97689,00.html
> >
> >
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> --
> James R. Frysinger University/College of Charleston
> 10 Captiva Row Dept. of Physics and Astronomy
> Charleston, SC 29407 66 George Street
> 843.225.0805 Charleston, SC 29424
> http://www.cofc.edu/~frysingj [EMAIL PROTECTED]
> Cert. Adv. Metrication Specialist 843.953.7644
>
