Horsepower was originally used to measure work horses did. I think it was measuring the time to perform a vertical lift of a measured amount of material out of a mine. It was adapted to mechanical engines. You are correct the operator "feels" the power. The reason small motorcycle engines seem powerful is because they turn very high RPM's and often have 5 or 6 speed engines. In otherwords the engine is producing close to max. power most of the time. Tractor engines normally lug down to peak torque before it is necessary to downshift. As somebody else said the John Deere two cylinder engines had tons of torque but were low RPM engines. When you go back to the formula of HP = Torque x RPM divided by 5252. Hope this helps, it is kind of hard to explain this way. A college professor would spend at least a day explaining it.
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