Paul
  I ran across this patent "Internal combustion engine with compounded air compression" what caught my eye was the application of the idea to a rotary engine in Fig 3.  in the patent they are using a turbo charger and a rotary compressor which is mechanically linked to the rotary engine.  Very interesting and maybe a good approach as maybe the smaller rotary compressor could be directly linked to the main engine and therefore no need for a clutch assembly?  Anyway, wanted to see what you thought.

Mike C.

Looks interesting but I don't see how we can use it in an aircraft.
As a compressor it will suck more HP than a turbo charger.

Paul Lamar