Posted by Ronnie Budd on December 24, 2020 at 10:41:34 from (184.53.32.53):
In Reply to: H.p. at lower rpm posted by 300jk on December 24, 2020 at 10:05:07:
Sure. It's simple. Horsepower is a theoretical number that is derived by measuring torque, then multiplying it by RPM, and then dividing by 5252. So all you need to do is find the torque of the engine at whatever RPM you are interested in and you can calculate the horsepower.
For example, 144 Ft/Lb s of torque multiplied time 2400 RPM and divided by 5252 yields a horsepower number of 65.80 HP.
Assuming that the engine is still making 144 Ft/Lbs of torque at 1700 RPM yields a horsepower number of 46.61 HP. But you have to realize, it's torque that is turning the shaft and turning the wheels. Horsepower is a theoretical number derived from a formula devised by James Watt back when he was selling steam engines and people wanted to know how many horses his engine would replace.
Because Horsepower is a theoretical number derived from a calculated formula, gearing can be (and is) used to multiply torque, but not horsepower.
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