Re: Old Horsepower ratings versus Rating on newer

Posted by PA Steve on June 02, 2004 at 17:28:03 from (68.236.141.34):

In Reply to: Old Horsepower ratings versus Rating on newer Engi posted by Tommy H on June 02, 2004 at 14:54:59:

There are a few things to keep in mind when talking about power. Will was right about 1 horsepower being the ability to exert a 550 pound force over 1 foot in 1 second. That's the first thing that comes to mind when we think about tractors pulling in the field. Mechanical power is always force x velocity, but since engines rotate, engine horsepower is torque x rotational speed. Hugh made a good point about many ratings these days being bench test ratings for the engine. A good tractor efficiently takes the power output capabilities of the engine and transmits them to the ground. That depends on things like drive train efficiency, weight distribution, tire tread and ground conditions. The power that makes it to the ground is the only thing that matters anyway, right?
Take it easy

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