I would like to know (out of sheer morbid curiosity) how constants in hydraulics are calculated. The constants are, for good ol' 'Merican units; 63025, 5252,and 231. These constants came out of "Introduction to Fluid Power." The constant 231 is how many cubic inches are in one gallon.
The equation for input HP is HP = (T * N)/63025. Why is '63025' used? Does that make sense? Basically I'd like to know where these units came from? I'm not sure if I explained my question better. I believe one of the responses I got pretty much hit the nail on the head.