"Boris Mohar" wrote: 700 Watts is almost one horsepower
^^^^^^^^^^^^^
Correct. If you are trying to transmit that much power at low RPM. the
torque will be way too high for a speed cable. If you're trying to run it
really fast, then the torque won't be the problem, but turning 90 degrees in
3" will be, because the cable will be rubbing on the outside of the housing,
and it will get REALLY HOT.

Look at a Weed Whacker type thing to get an idea what you need. Or a Dremel
flex shaft drive.