How much power is expended by the horses

Interestingly, a horse exerting 1 horsepower can lift pounds of coal feet per minute, 33 pounds of coal feet in one minute, or pounds 33 feet in one minute. You might notice a slight difference between European and US hp figures. We replace pounds with kilograms of force and feet with metres to provide a figure of 75 metre-kilograms of force per second.

That means one metric hp is equivalent to about 0. You can calculate it yourself if you enjoy maths. Otherwise you can simply use one of the many free converter websites that let you enter one way of measuring and immediately see the equivalent. The stunning Princess 85 motor yacht has a total power of hp thanks to its magnificent twin Caterpillar C32A hp diesel engines. But what does it mean in practical terms?

How fast does this sleek superstar actually travel over the water? If you want to know what that means in miles per hour, visit our post about the subject. The spacious, smooth, super-quick Princess 70 features the latest in contemporary flybridge design as well as a choice of diesel engine configurations.

The powerful MAN V8 option with its two mhp engines delivers a dazzling maximum estimated speed of knots via an kW output, and the MAN V12 version with two mhp engines gives you a maximum estimated speed of knots via an output of kW. The engines are powerful but quiet, incredibly reliable, and feature low fuel consumption… unlike several thousand actual horses! To better understand this—and avoid unhappy memories of arithmetic class—picture a lone horse raising a pound bucket of water from the bottom of a foot-deep well in 60 seconds.

That amount of work equals one horsepower. Watt used his newly invented unit of power to compare how much work his stationary steam engine could do with that of a horse.

It was the just marketing magic he needed to convince companies that the newfangled technology was the better power source. That breakthrough, as we all know, revolutionized both industry and transportation, and would eventually lead to the rise of steam ships and locomotives. And it's also why buyers of everything from muscle cars to lawn mowers owe a debt of gratitude to James Watt. Users of lightbulbs too.

Engineers posthumously honored Watt by naming a unit of power after him, the watt. Ironically, one "watt," doesn't equal one horsepower. For the record, watts 1. In the end, the creation of horsepower was as much a result of good salesmanship as engineering savvy. James Watt knew that one without the other was like a cart without a, ahem, horse. Watt defined this amount as "the amount of work required from a horse to pull pounds out of a hole that was feet deep".

James Watt chose to compare his engine, which was capable of sustaining it's power output for a full day, to a horse's average power output over a day. When purchasing a new car, the crib sheet includes two output numbers with the engine: horsepower and torque.

If you live in the United States or Canada, those numbers will be listed with the units of SAE certified Horsepower which is the same as horsepower, but certified by the SAE and pound-feet. If you live in Europe, the outputs will be listed in Watts and Newton meters. The core difference between these two sets of units is that whereas horsepower is a measurement of power - referring to an amount of energy transfer over time- Newton-meters are a measurement of torque - a measurement of rotational force, which has no unit of time.

Another difference between horsepower and torque is that horsepower is energy output over time, and torque is instantaneous. In the context of cars, broadly speaking, this means that a car with a lot of horsepower will have a higher top-speed than the same car with less horsepower.

Similarly, a car with a lot of torque will be able to accelerate faster than the same car with less torque, as its instantaneous output will be higher. Fossil Fuels. Nuclear Fuels. Acid Rain.