On Sun, 05 Sep 2004 17:39:45 GMT, "Jerry Martes" wrote:
I dont know how to measure flow. I could probably learn But, I think
here is no need to measure flow in the hydraulic path in order to measure
motor HP. The pump is doing the work on the fluid. The motor supplies the
power to the pump. I wanted to know only how muvh work the motor is doing.
It is pretty essy to measure and record motor RPM. I figure the pump could
be mounted firmly and measure the motor's torque with the motor base free to
spin - or - Mount the motor firmly and allow the pump to rotate.
I'm pretty confidant the motor's HP can be calculated by measurement of
the pump's shaft RPM and the pump Torque.

Yes. You are simply using the pump as an adjustable brake. You don't
need to know, or care, what the pump's efficiency is. You don't need to
know or care what pressure or flow it produces. All you need to know
to calculate motor hp is RPM and torque. A load cell, or even a lever
arm and spring scale, restraining the pump from rotating will give you
torque. You can measure RPM directly. hp = RPM x torque.

Gary