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Re: Super C specifications and horsepower stuff
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Posted by Steve - IN on November 30, 2003 at 12:31:28 from (12.222.30.13):
In Reply to: Super C specifications and horsepower stuff posted by Tim on November 30, 2003 at 11:50:53:
Tim,
A Super C was rated at around 23hp on the PTO in the Nebraska test (the only formalized 3rd party testing outfit for tractors in the USA). The basic formula for horsepower is still the same now as it was 150 years ago when James Watt said 1 horsepower = 33,000 foot / pounds of work in 1 minute. The formula for that when you're measuring something with a flywheel is: HP = (Torque x RPM)/5252 (5252 is a constant produced because the flywheel is a circle and subject to the magic laws of Pi - 3.14 ad infinitum). The difference between SC and your lawn tractor is the relationship of torque and RPM. Let's assume your SC is HP rated at 23HP at 1500RPM, which your lawnmower is rated at 23HP at 3000RPM. Do the math in your head - (torque at rated RPM = horsepower x 5252/RPM.) - and you'll find your SC has twice the torque of your lawntractor. Or, more exactly with acutal numbers and a calculator: SC torque = 23*5252/1500rpm = 80 ft. lbs. Versus 18hp lawnmower torque = 18*5252/3000rpm = 31 ft. lbs. of torque. Actually, the Super C might be a bit higher in RPM than that at rated HP, and the lawnmower might be a little lower in speed, but you get the general idea.
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