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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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