Horsepower

SPEED, in the science of bearing application and power transmission, is expressed in terms of the revolutions per minute (rpms) of a rotating object.

VELOCITY is speed in a designated direction and is usually expressed in terms of feet per minute (fpm).

FORCE is the element that produces a change in the velocity of an object. It is usually expressed in pounds.

WORK occurs when a force moves an object through a distance. It is usually expressed in foot-pounds or inch-pounds.

POWER is the rate of doing work. It is usually expressed in foot-pounds per minute (fppm).

HORSEPOWER (hp) is the unit of power. It is the power required to lift 33,000 pounds one foot in one minute.

Illustration of Horsepower

A Foot-Pound is the moment created by a force of one pound applied to the end of a lever arm one foot long. Pound-feet indicate torque.

Example:
25 hp at 150 rpm = 10,504 Pound-Inches Torque
25 hp at 1.50 rpm = 1,050,400 Pound-Inches Torque
2.5 hp at 1.50 rpm = 105,040 Pound-Inches Torque

hp =    pounds (#) x feet
         33,000 x no. minutes

hp = Force (lb-in) x fpm
               33,000

hp =  Torque (in lb-in) x rpm
                   63,025

hp =  Torque (in lb-ft) x rpm
                    5,252