Not sure this will help, but horsepower is a measure of "Power", whick tecnically is the time it takes to get a unit of "work" done. "Work" is defined as force x distance, or can be translated to torque ( Force x Moment arm or ft-lbs ), or joules, etc.. When you look at the conversions in Northern tool, there are conversions between the different types of motors because the relationship between torque and time is not the same for all of them, or said a different way, they achieve maximum torque at different places on the performace curve. As Murf mentioned, they operate at different RPMs, therefore their rated torque is at different RPMs, or the time depenmdant rate at which they get work done is different. The relationship between torque and horsepower is not the same for each type of engine, or motor (they are all technically engines). They are all capable of producing the same power, but don't operate at the same efficiency doing it.

1 horsepower equals 550 foot-pounds/second. A 5 horse engine can do the same work as a 30 horse engine, but not in the same amount of time. The conversion rates in Nortehrn are a guide within a range of motors, but not a direct conversion for all engines.

Clear as mud now.

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