Why are the torque and horsepower of an engine equal at 5252 rpm?

It’s related to how much work a horse will do related to the same work done by a steam engine. One horsepower is equal to 33,000 foot-pounds of work per minute. Add in the equations relating to torque and velocity, and you’ll find that horsepower always equals torque multiplied by rpm, divided by 5,252.

What is the constant of horsepower?

Horsepower = (3,000 x 6) / 63,025 = 0.286 63,025 is a constant when using RPM for speed and in-lbf for torque units. 5,252 is another common constant if the speed is in RPM and torque is in ft-lbf. If the units are different then simply make the unit conversion.

How is horsepower and torque measured?

Torque is measured in pounds-feet, meaning a force in pounds acting on the end of a lever measured in feet. Once we’re able to measure torque, we can then measure horsepower. The formula is simple: Multiply torque by the engine speed (measured in rpm), then divide that by 5,252 to get the horsepower at that rpm level.

How does horsepower get measured?

Mathematically speaking, horsepower is the force needed to move 550 pounds one foot in a second, or 33,000 pounds one foot in a minute. These numbers are plugged into a formula (torque x RPM / 5,252) to determine the horsepower. Horsepower is found by measuring torque because torque is easier to calculate.

Where is HP 5252 from?

The number 5,252 is the result of lumping several different conversion factors together into one number. First, 1 horsepower is defined as 550 foot-pounds per second (read How Horsepower Works to find out how they got that number). The units of torque are pound-feet.

What is the equation between horsepower and Watts?

Since one electric horsepower is equal to 746 watts, the formula to find watts is to multiply electric horsepower by 746.

How does dynamometer measure torque?

The torque is produced by the useful load that the prime mover, motor, or machine is carrying. Absorption dynamometers, on the other hand, produce the torque that they measure by creating a constant restraint to the turning of a shaft by either mechanical friction, fluid friction, or electromagnetic induction.

Where does the term horsepower come from?

James Watt, who invented steam engines, figured out a mathematical way to equate horses to engine power. Thus the term horsepower was invented. Watt measured the capability of a big horse to pull a load and found it could pull a weight of 150-pounds while walking at 2.5 miles per hour.

Where does the 5252 constant come from?