این لغت Brake زیاد به کار برده میشه ولی من معادلی براش نشنیدم. این تعریفیه که ویکیپدیا برای bhp گفته.به نظر من اینطوری میشه گفت:Brake horsepower (bhp) is the measure of an engine's horsepower before the loss in power caused by the gearbox, alternator, differential, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc. Brake refers to a device which was used to load an engine and hold it at a desired RPM. During testing, the output torque and rotational speed were measured to determine the brake horsepower. Horsepower was originally measured and calculated by use of the indicator , and later by means of a De Prony brake connected to the engine's output shaft. More recently, an engine Dynamometer is used instead of a De Prony brake. Although the output delivered to the driving wheels is less than that obtainable at the engine's crankshaft, a dynamometer gives an indication of an engine's 'real world' horsepower after losses in the drive train and gearbox. This gives an accurate indication of how a car engine will perform when used normally rather than ideal non-loaded circumstances.
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