Back ground I am developing a safety training class. I lost...

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Question by Lincoln Ritterhouse
Submitted on 1/12/2004
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Back ground I am developing a safety training class. I lost my left thumb about 13 years ago. Recently a young man lost his right thumb and three fingers as well. I was looking at motor torque values to determine how much force is produced from a motor. I plan to use this information to graphically explain how hard a machine can pull to pull a person in. James Watts horsepower can be converted to 550 lb/ft per sec. but a electric motor for one horse power is nothing near this value. I look a manufactures charts and get 3 to 6 ft/pound for a 1 hp motor. What am I seeing wrong. Feel free to e-mail me on this problem. Thank you!

Answer by Ohm0
Submitted on 6/26/2005
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A very surprising amount of force is used up overcoming the inertia within, and the friction between, the components of the engine itself. Consider the weight of the pistons, and how far they move in a single second of going up and down!

Answer by Fire Marshal Bill
Submitted on 6/27/2005
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Let me show you something.......

Answer by mark lee
Submitted on 3/10/2006
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background

Answer by Ian
Submitted on 4/6/2006
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I think you're getting confused because the one variable that isn't being considered is: time. Horsepower generally is defined as 'work done over time on a specific weight at a specific height' or put another way 550 ft/lb per sec is the ability to lift a 1lb weight, 1ft off the ground for 1 second. There are two variables involved here: weight over time. The second set of values you provide does not indicate the period of time. Yet your first set does.

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