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The term "horse power" probably predates the name of the horsepower unit of measurement. [Notes 1] The word "power" in late-19th-century American English, for example, was often used for any example in the whole category of power sources, including water powers, wind powers, horse powers (for example, sweep powers), dog powers, and even (in a few cases) sheep powers; in the Pennsylvania Oil ...
The Jamaican sprinter Usain Bolt produced a maximum of 3.5 hp (2.6 kW) 0.89 seconds into his 9.58 second 100-metre (109.4 yd) sprint world record in 2009. [15] [failed verification] In 2023 a group of engineers modified a dynamometer to be able to measure how much power a horse can produce. This horse was measured to 5.7 hp (4.3 kW). [16]
A horsepower-hour (symbol: hp⋅h) is an outdated unit of energy, not used in the International System of Units.The unit represents an amount of work a horse is supposed capable of delivering during an hour (1 horsepower integrated over a time interval of an hour).
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They can reach speeds of up to 34 km/h (21 mph; 18 kn), [1] [2] [3] easily exceeding the world records set by competitive rowing which stand at about 20 km/h (12 mph; 11 kn). This speed advantage is achieved since hydrofoils lack a submerged body to provide buoyancy , greatly reducing the drag force.
Horse ferry in Chillicothe, Ohio in 1900. Two horses for power, with Capt. Horace McElfresh and son. A team boat, horse boat, or horse ferry, is a watercraft powered by horses or mules, generally using a treadmill, which serves as a horse engine. [1] [2] Team boats were popular as ferries in the United States from the mid-1810s to the 1850s.
Horse 'gins' were a common site in coal mining areas, and were often used where the coal was shallow, and there was no need to sink deep mine shafts. The gin was a wooden wheel device on a spindle that was pulled round by a horse. This then operated a simple pulley system that raised or lowered loads up and down the shaft. [7]
A water power engine includes prime movers driven by water and which may be classified under three categories: [1] Water pressure motors, having a piston and cylinder with inlet and outlet valves: their action is that analogous of a steam- or gas-engine with water as the working fluid – see water engine