Lets say the engine HP is 200 at 6000 RPM.
The engine torque is  then 175 foot pounds at 6000 RPM.
The prop torque is 2.85 x 175 or 498.75 foot pounds.
Exercise for the reader. What is the prop HP?

Paul,

 The horsepower will remain the same (200) The PSRU trades speed for torque. The PSRU has increased the torque but reduced the speed.    Which is what we want to keep the prop tips sub sonic.  Why? Have you developed a perpetual motion machine we don't know about????   :-)
Charlie Kuss

 
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