# Thread: Horsepower of a different kind.

1. First I want to say hi to everyone, first time poster here.

Ok, I could not find the answer to this question anywhere I looked ...so I figured this place was one of the few places to find it.

Horsepower. I know the measurement of horsepower is the ability to move 33,000 lbs- one foot- in one hour. Here is my question, I want a rotating mass to equal a certain amount of horsepower, its not an engine. Picture the rotating mass as a wheel, lets say it is 20 inches in diameter, how heavy would it have to be and at what rpm would it have to be turning to equal a certain amount of horsepower ? If rpm is even needed in the equasion. Is there a formula (not that I would know how to use the formula) Am I asking the right questions ? Am I in the right section ?

I would appreciate any help I can get on this, thanks alot guys/gals.

2.

3. First of all, 1 hp = 33 000 foot pounds per minute, not per hour.

If you have a mass with a certain moment of inertia and rotational speed, you can calculate the rotational kinetic energy. The amount of horsepower it puts out is dependent on how quickly you will dissipate that energy. So you need to specify a time as well.

What exactly are you trying to do?

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