kool wrote:

How do they rate air compressors at 5HP when they have a 3/4 or 1 HP motor
driving it?




AFAIK that's some a not very useful rating called "peak horsepower"
which I believe is the horsepower which can be delivered for a VERY
brief time if the motor is up to speed and you suddenly apply a heavy
torque load to it.

I think the energy must come from inertial storage in the rotating
parts, but it gets "used up" pretty quickly and the motor HAS to slow
down (and burn up?)

If someone has a better explanation, or a cite to an industry standard
definition, I'm all ears.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.