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Re: Demystifying (for me) torque and horesepower


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Posted by flyingace on March 03, 2012 at 15:24:54 from (64.77.223.91):

In Reply to: Demystifying (for me) torque and horesepower posted by Ken Macfarlane on March 01, 2012 at 12:02:07:


Janicholson said: (quoted from post at 18:42:44 03/02/12) Horse power is only how fast a specific task can

get done. Pull a hay wagon weighing 2000 pounds

up a 10% grade for one mile in 6 minutes (assumes

full rated power on the engine/motor). It can be

done by any power source with that rated horse

power.

Thus a tiny MC racing engine, or a 2 cylinder JD.

are equal. It certainly requires different

gearing to have it take place, but the power is

equal.

The difference between them will be in the

capability to continue to produce that level of

power output. Unless force fed massive cooling

air, the MC engine would seize. If it made it

(with extra air) it would not do it 20 times in a

row. It is designed to have to make 15 horse

power at 80 MPH for a long time, and 150 HP for 10

seconds at a burst.

The tractor engine can do it for 10,000 hours.

Jim


See, I don't agree here. In theory, a little electric motor that spins at ridiculously high RPM could make as much HP as a 40 HP JD. Say it has only 1 ft/lb of torque, but spins a 210,000 RPM. According to the formula I used 40 HP = (1 * X) / 5252 where X is RPM. 1 ft/lb of torque will never be enough to pull a plow now matter how fast it spins or how low it's geared, right? I'm guessing this would also be true for any motorcycle engine making 40 Hp.

This post was edited by flyingace at 15:26:08 03/03/12.



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