Posted by JMOR on November 06, 2012 at 14:00:29 from (72.181.173.171):
In Reply to: True Horse Power posted by 36 coupe on November 05, 2012 at 21:40:15:
John T, good try, but it probably won't, because some just can't grasp that a small motor with a 12 or 13 ft-lb torque output moving the same load at the same speed as a larger 60 ft-lb output motor. Or they want to move the argument to durability, acceleration, range of operation, etc.,etc., etc. Sure gears are not 100% efficient, but they are not killers either. 5.8:1 ratio isn't out of the realm of large equipment such as trucks & tractors. My numbers I tossed out could be a physically small 20hp, 12.5 ft-lb, 10, 500rpm unit with 5.8:1 gear box @ 80% efficiency and move the same load at the same speed as a larger 20hp, 60 ft-lb, 1800rpm unit. The argument shouldn't be about torque and/or horsepower and equivalency. That is just simple multiplication & division. The engine used depends on many factors, some of which have been discussed, but not whether hp is hp or torque is torque.
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