For a farmer I believe horsepower is better explained by pulling force combined with speed. That is what he can see in the field and should understand it easier. Pulling a load of say 2000 lbs at 3 mph will be equal to about 16 drawbar horsepower, engine horsepower required could be in the order of 20hp ( 1hp will be lost in transmission and say 3hp by wheelslip).If the speed will be increased to 6mph the drawbar horsepower will also doubled to 32 hp. Or if the pulling force could be doubled to 4000lbs at the same speed the drawbar horsepower could also be doubled.If the tractor is not weighted properly it will however not be able to pull 4000 lb, same with the engine,if its maximum horsepower output is only something like 35hp it will not be able to pull a load of 4000 lb at 6 mph. Engine will just die out.
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