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Engine power is the power that an engine can put out. It can be expressed in power units, most commonly kilowatt, pferdestärke (metric horsepower), or horsepower.In terms of internal combustion engines, the engine power usually describes the rated power, which is a power output that the engine can maintain over a long period of time according to a certain testing method, for example ISO 1585.
DIN hp is measured at the engine's output shaft as a form of metric horsepower rather than mechanical horsepower. Similar to SAE net power rating, and unlike SAE gross power , DIN testing measures the engine as installed in the vehicle, with cooling system, charging system and stock exhaust system all connected.
units: 1 horsepower [21] 7.5 × 10 2: astro: approximately the amount of sunlight falling on a square metre of the Earth's surface at noon on a clear day in March for northern temperate latitudes: 9.09 × 10 2: biomed: peak output power of a healthy human (non-athlete) during a 30-second cycle sprint at 30.1 degree Celsius. [22]
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The typically used metric unit of the power-to-weight ratio is which equals . This fact allows one to express the power-to-weight ratio purely by SI base units . A vehicle's power-to-weight ratio equals its acceleration times its velocity; so at twice the velocity, it experiences half the acceleration, all else being equal.
The template common metric prefixes creates an infobox that lists the most commonly used metric prefixes. The list is a subset of the list in the 8th edition of the official brochure of the BIPM (SI units and prefixes).
The fuel consumption per mile or per kilometre is a more appropriate comparison for aircraft that travel at very different speeds. [citation needed] There also exists power-specific fuel consumption, which equals the thrust-specific fuel consumption divided by speed. It can have units of pounds per hour per horsepower.
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity.