Wiktionary
brake horsepower
n. The useful horsepower of an engine as measured at its drive shaft.
Usage examples of "brake horsepower".
That diesel engine on the compressor may not look like much, but it puts out five brake horsepower.
Instantly the deck below Crofts reared as the screws bit deep and Marauder leapt ahead, with rising bows and the white water smashing and flaring on either side and the wind suddenly a shrieking, clawing solid thing as two thousand brake horsepower bulleted her across that red-reflecting sea.