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Horsepower (hp or HP or Hp) is several non-SI units of power. It was originally defined to allow the output of steam engines to be measured and compared with the power output of draft horses. The horsepower was widely adopted to measure the output of piston engines, turbines, electric motors and other machinery. Different regions adopted different definitions of the unit. Most countries now use the SI unit watt for measurement of power.

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Wikipedia About Horsepower

Horsepower (hp or HP or Hp) is several non-SI units of power. It was originally defined to allow the output of steam engines to be measured and compared with the power output of draft horses. The horsepower was widely adopted to measure the output of piston engines, turbines, electric motors and other machinery. Different regions adopted different definitions of the unit. Most countries now use the SI unit watt for measurement of power.

The definition of a horsepower unit is different in different applications; application outside of the context of a particular definition will be inaccurate.

  • One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts
  • A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts
  • A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9809.5 watts
  • One horsepower for rating electric motors is equal to 746 watts
  • A Pferdestärke is a name for a group of similar power measurements used in Germany around the end of the 19th century, all of about one metric horsepower in size.

An ALAM or SAE horsepower is not a unit of power but instead is a measure of internal combustion engine displacement, and an RAC horsepower or tax horsepower is a differently defined unit of displacement.

Where units of horsepower are used for marketing consumer products, often measurement methods are designed by advertisers to maximize the size of the number produced for any product, even if this may not reflect realistic capacity of the product to do work when used in normal conditions.

History of the term "horsepower"

The development of the steam engine provided a reason to equate the output of horses with the engines that could replace them. In 1702, Thomas Savery wrote in The Miner's Friend: "So that an engine which will raise as much water as two horses, working together at one time in such a work, can do, and for which there must be constantly kept ten or twelve horses for doing the same. Then I say, such an engine may be made large enough to do the work required in employing eight, ten, fifteen, or twenty horses to be constantly maintained and kept for doing such a work..." The term "horsepower" was coined later by James Watt to help market his improved steam engine. He had previously agreed to take royalties of one third of the savings in coal from the older Newcomen steam engines. This royalty scheme did not work with customers who did not have existing steam engines but used horses instead. Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet in radius, therefore the horse travelled 2.4 × 2π × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds (assuming that the measurements of mass were equivalent to measurements of force in pounds-force, which were not well-defined units at the time). So:

Search results for Horsepower

HowStuffWorks "Measuring Horsepower"

Measuring horsepower requires a power-reading dynamometer. Learn how plotting horsepower against rpm values produces a graph called a horsepower curve.www.howstuffworks.com/horsepower1.htm

What is Horsepower?

Horsepower is defined as work done over time. The exact definition of one horsepower is ... In this case, you'd have expended one horsepower-minute of energy. ...www.web-cars.com/math/horsepower.html

Buy and Sell- Agricultural

Horsepower.com is a business-to-business global online marketplace enabling ... Simply. sign-up now or take a guided tour of Horsepower's features. ...www.horsepower.com/

Horsepower: Gross vs. Real-World

Horsepower is officially defined as "the amount of energy required to lift 550 ... Generally speaking, horsepower is an indication of how capable a vehicle is at ...www.edmunds.com/ownership/techcenter/articles/43845/article....

Horsepower - Wikicars

The horsepower (hp) is the name of several non-metric units of power. In scientific discourse the term "horsepower" is rarely used due to the various ...wikicars.org/en/Horsepower

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News about Horsepower

Museum ship Intrepid heads back to Manhattan pier

AP via Yahoo! News Hooked up to four powerful tugboats, the World War II aircraft carrier Intrepid began what could be its final cruise on Thursday — a return to the Manhattan pier where it has served for 24 years as a military and space museum.http://news.yahoo.com/s/ap/20081002/ap_on_re_us/intrepid_ret...

Ford's new F-150 at a glance

AP via Yahoo! Finance Ford Motor Co. has begun production of its 2009 F-150 pickup, incorporating several design and drivetrain changes to boost fuel economy. Here are details on the new vehicles:http://biz.yahoo.com/ap/081002/ford_new_f_150_glance.html?.v...

Museum Ship Intrepid Returns to Manhattan Pier

Fox NewsHooked up to four powerful tugboats, the World War II aircraft carrier Intrepid began what could be its final cruise on Thursday — a return to the Manhattan pier where it has served as a museum. http://www.foxnews.com/story/0,2933,431864,00.html

Horsepower how-to: Garrard high school student makes his own fuel

The Danville Advocate-MessengerIn a time of $4 per gallon diesel fuel, Christian Wyler has skills that could make Exxon executives shudder.http://www.amnews.com/public_html/?module=displaystory&story...

USS Intrepid returns to Manhattan

MSNBC The World War II aircraft carrier Intrepid returned Thursday to the Manhattan pier where it has served for 24 years as a military and space museum. http://www.msnbc.msn.com/id/26989870/

News about Horsepower

Acura, Porsche add flash, power to flagship models

Atlanta Journal ConstitutionHorsepower peaks at 201. The mid-range TL is a larger, fourth-generation model and has the most powerful sedan engine in Acura’s lineup: a 305-horsepower, 3.7-liter V-6 with 273 foot-pounds of torque. This powerplant is available in the uplevel TL ... http://www.ajc.com/ajccars/content/ajccars/content/stories/2...

Pioneer Drilling Appoints Two New Directors

ForbesIts fleet consists of 69 land drilling rigs that drill in depth ranges between 6,000 and 18,000 feet, 69 workover rigs (64 550-horsepower rigs, four 600-horsepower rigs and one 400-horsepower rig), 54 wireline units, and fishing and rental tools. ... http://www.forbes.com/prnewswire/feeds/prnewswire/2008/10/06...

2008 Toyota Avalon XLS Review

The Auto ChanelToyota probably made a wise choice when it decided that the only engine needed for the Avalon is this 3.5-liter, 268-horsepower V-6. Rated at 19mpg-city and 28-highway, it is mated to an efficient six-speed automatic transmission. Making 248 pound ... http://www.theautochannel.com/F/news/2008/10/12/169196.html

Wolverine Bronze Company Uses Low Pressure Casting to Form 1200 ...

PR.comTheir state-of-the-art system will be used to sand cast precision parts of the 14-liter, 1200-horsepower, DiMora Volcano V16 engine. In traditional sand castings, components are gravity-poured from the top of a mold, a process that is rife with ... http://www.pr.com/press-release/51582

The Cheapskate

CNET NewsAs for horsepower, I think it has more than enough for everyday computing--and way more than your basic net book, which costs about the same (if not more). I haven't used this particular model, but I've reviewed several Acers in the past year, and ... http://news.cnet.com/8300-13845_3-58.html?keyword=%22laptop%...

Search results for Horsepower

Horsepower Magazine

Horsepower Magazine - All Australian Horse Magazine ... 1st September 2008. Yes, the website has changed again! We think we might stick with this design....!http://www.horsepower.net.au/

Horse Power - focusing on the preservation of WIld Mustangs and Burros ...

wild & free, wild and free, nevada mustang license plate - Horse Power, is Nevada's wild & free, wild mustang and burro advocate non-profit group.http://www.nvhorsepower.org/

HorsePower - Welcome to Horsepower

Quality Equine Nutrition Products HorsePower aims to provide quality equine nutrition products, based on sound, scientific principles, with an emphasis on low-grain feeding and ... http://www.horsepower.com.au/

Buy and Sell- Agricultural

BUY AND SELL . Guided Tour . About Horsepower . Tools & Services . Sign Up . Contact Ushttp://www.horsepower.com/

Horsepower Golf: Custom Golf Clubs & Equipment for the Long Drive ...

Features SMT and top long drive shafts.http://www.horsepowergolf.com/
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Videos found for Horsepower

ULTRA EXCLUSIVE - 1001 Horsepower B...

ULTRA EXCLUSIVE - 1001 Horsepower BugattiWith only a few hundred made this year, not many people will get to see Bugatti's $1.5 million beast, the Veyron. Which is why we jumped at the chance to br...Flash - Video

ULTRA EXCLUSIVE - 1001 Horsepower B...

ULTRA EXCLUSIVE - 1001 Horsepower BugattiWith only a few hundred made this year, not many people will get to see Bugatti's $1.5 million beast, the Veyron. Which is why we jumped at the chance to bring it to you! For more...Flash - Video

900 Horsepower On NOS

900 Horsepower On NOSThis van takes the driver on the ride of his life. Ranked 3.41 / 5 | 5,058 views | 2 comments Click here to watch the video Submitted By: dogznova Tags: Speed Racing NOS Nitrous...Flash - Video

MetroHorse - MetroHorse-Does Your B...

MetroHorse - MetroHorse-Does Your Business Have Horsepower?Does Your Business Have Horsepower?: MetroHorse.com is an innovative online marketplace where local businesses advertise, make multimedia pitches, and bid for shoppers' business....Flash - Video

Nissan GTR Horsepower: The Truth

Nissan GTR Horsepower: The TruthUsing a new type of dyno that can measure driveline drag, we answer the question that everyone wants to know the answer to: how much horsepower does the Nissan GTR actually have?Flash - Video

Answers for Horsepower

Brandon BHow much horsepower do you think i have stock?Brandon Byou have a quick power band but you wont have more than 170 hp at the wheels. you need some stage 3 cams and and more fuel or at least run race gas. 105+ octain fuel. i had a 2002 gti and i stomped ma...Jay guyHow much horsepower can I get from raising my piston compression 2 points and running premium gas?Jay guyAre you in a hurry? Raising compression ratio is expensive and causes "pinging". by itself, you won't notice much improvement. racers use a combination; hotter camshaft, freeflow exhaust, ported heads...Corbet PHow many horsepower is the engine on a 1980 suzuki fa 50 engine?Corbet P5-6 poniesGod'sStrengthHow much more horsepower will adding a cold air intake system to my car give me?God'sStrengthYou could see anywhere from a 4-15ish horse power increase. As for acceleration and speed differences they will most likely be pretty small and unnoticeable. For real power go to forced induction (t...jeni3726How can i add horsepower without sacrificing fuel efficiency?jeni3726i own a repair shop,and ts hard to do on that car,unfortunately when you gain on one ,you loose on the other one,and that's what happens when you gain horse power,you loose on mileage,you can add a c...
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