Paul,   I remember the big motor starters and had some which also
 did from one to five speed control of the three phase motor. They
 require maintenance on the solid silver contacts and resister
 elements and fail due to heat cycle fatigue and arcing as the points
 close.  We usually changed to a Wye Delta starter contactor rather
 than fixing them.


 My prefferred method of transforming
 power is with a hydraulic piston pump. A variable displacement pump
 that will fit in a 10" cube can easily need 120 HP to turn it at
 3500 RPM and full flow at 3000 PSI. One common frame size goes up to
 60 GPM.  If you know the pressure and RPM of the pump you can
 determine HP to a fraction of a horsepower. There are also
 mechanical lever controls available on these pumps ( think Bobcat
 skid loader) that can set the displacement for different loads.

     The pumped oil would be sent thru an adjustable valve or an
 orfice to return to the tank and the HP would go off as heat. This
 makes a lot of heat and in fact I used to have a relief valve that I
 could drop the pressure to just 600 PSI to warm up the oil in the
 winter if the hydraylics were outside the building.This was done to
 reduce the viscosity of cold oil to prevent pump damage.


 If
 you set pump volume at 1000 Rpm down to where the turbocompound can
 turn it then read the pressure rise  as the HP rises and record the
 pressures you can read the HP of the pump curve charts.

 george grimes




 A power steering pump would be easy to integrate and
control pressure with an adjustible pressure relief valve.
Dale Davies

Thanks for all the ideas and help guys.
I am going back to the old standby of a prop dyno.
Much cheaper and less tech risk.

Paul Lamar