"Bob Mannix" wrote in message
...

"Grunff" wrote in message
...
JK wrote:

1 BHP (Brake Horsepower) = the energy required to move 1 kilogram 1
metre in
1 second on a level surface without friction


Only in the same way that one pound of cheese is the distance between
here and there, bypassing Tazmania.


I was just going to say "no it isn't". I prefer your version!

1 Horsepower is the power required to to lift a mass of 33 000 pounds
through a vertical distance of 1 foot in 1 minute. A Brake Horsepower is
an
oddly measured quantity only applicable to rotating motors that gives an
indication of what it can achieve if pushed to breaking point (no pun
intended). "Rated horsepower" is also used and is what it can do over long
periods (eg 1/4HP motor) at the output shaft under normal conditions.
"Horsepower" (as defined above) is the only fundamental unit and clearly
has no connection with metric units.

One HP is 746W.

E.g., a 75 kW engine is equivalent to near enough 100 HP.
A 50 HP engine, quite common, is the equiv of a combi boiler.
Cars are now being rated in kWs.