grzybek,
http://en.wikipedia.org/wiki/Horsepower
w brief:
hp (DIN)
DIN horsepower is the power measured according to the German standard DIN 70020 and like the SAE net figure is measured at the flywheel. However, DIN "horsepower" is often expressed in metric (Pferdestärke) rather than mechanical horsepower.
Metric horsepower, as a rule, is defined as 0.73549875 kW, or roughly 98.6% of mechanical horsepower. This was a minor issue in the days when measurement systems varied widely and engines produced less power, but has become a major sticking point today. Exotic cars from Europe like the McLaren F1 and Bugatti Veyron are often quoted using the wrong definition, and their power output is sometimes even converted twice because of confusion over whether the original "horsepower" number was metric or mechanical.
Tyle definicji...
