The difference comes from the various duty cycles offorded by their design. HP = the power required to lift 33,000 lbs a distance of 1 ft in one minute. Given the right combination of gears and/or pullies , any one horse power unit will do this once. That's only one minute of work. A certain power unit may only be able to do this for 5 min , another 10 hrs , and still another indefinately before mechanical failure. But they all had one hp and that means they only have to be able to do it once to get that rating. Some may have to turn 5000rpm to achieve that 1 hp. Some 500 and some 2200. How long do you think a 1hp model airplane engine running 10,000 rpm will last lifting 33,000 lbs a foot a min for 10 hours? It's actually such a misleading and meaningless measurement of true ability that it should be outlawed as a measurement of comparison between products. Max torque is all that matters. It peaks at an rpm governed by the volumetric efficiency of the engine and /or the design parameters of any power generating unit. You cant just add rpm to get more. Max is max. Any engine / motor should be run at the max torque rpm and use gears/pullies or hyd to achieve the required results. There are a lot of 45 hp JD "D",s still going strong after 65yrs of heavy work. How many 45 hp Kubota,s will even make it half that long?? It ain't about horsepower , and never was.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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