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Horsepower is an imperial unit of power. The conversion to the SI unit, watts, varies with the measurement;

Generally: 1 horsepower = 746 watts
Mechanically: 1 horsepower = 745.7 watts
Boilers: 1 horsepower = 34.5 pounds steam at 212 Fahrenheit


Horsepower may be supplied as;

  • Brake horsepower (BHP) - output at drive end of engine (before accessories)
  • Shaft horsepower (SHP) - output at the end of the propeller shaft
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