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Probably because HP is just a mathematical equation based on Torque. However I don't think they ALL meet at 5200 there probably is some exception



5252 is the constant used to determine horsepower from torque, using the formula....HP=torque x rpm/5252
It is derived from hp observations by James Watt....... http://www.revsearch.com/dynamometer...orsepower.html 


great post old bogie....
but I have always chuckled big time about how he did his calculations to come up with a one horsepower... was it a Clydesdale or a Morgan or a Shetland pony pulling the bar...big difference in "available" TQ....(and a license to "fib" the results) how old was this horse,,, if I was the horse it would be moving reaaallllllly slow! how many "hands high" was this horse...there's a big "stride" difference between a Tenn Walker and a Mule (aka mph walking) at what altitude did he do his test.....even a Clydesdale would run out of "TQ" pretty darn quick at 10,000 ft! bad enough he started with "inexact" base info (the foot measurement and pounds.) then he uses a "unnamed" horse to declare what one horse power actually is.... it is pretty amazing to me that the term (HP) has stuck around for so long...it's so awkward to work with it is so much easier to calculate with Kilowatts for Hp and Newtons for TQ hey, just messin' around ...no reply needed Last edited by red65mustang; 04142008 at 02:01 PM. 


Quote:
Inconvenient measure seems to be what English measures are all about, but hey what about our language, Anglo/Saxon words attached to a Latin structural framework implemented backwards. And that horse, who's lost to history, that would have been the most famous animal of all time, Godzilla and King Kong excepted. In a way, lest we forget, Mr. Watt was a salesman and when do such optimists let the details of what numbers mean get in the way of a sales campaign. Bogie 

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