This triggered an idea in my brain. Why not use an exhaust
ejector to add air mass and kinetic energy to the exhaust gas and cool it
off at the same time? This might be very valuable with a turbo compound
set up. The ejector could be curved for packaging reasons. Would also work
for turbo charging of course. The cooling air supply would be connected
to a ram air scoop behind the prop to get an unlimited supply of cool air.
This could be a very significant break through in turbo compounding the
rotary.

Patent pending :)

Paul Lamar ...No rotor no motor.

Paul,
Do you mean like Bill's and my design, with duel exhaust augmentation, with
cooling air. I wondered how that might work with a turbo.
George ( down under)

Sorry to disappoint you guys but exhaust ejectors were invented back in
WW II :)

     Manganiello, Eugene J Bogatsky, Donald , ***An experimental
     investigation of rectangular exhaust-gas ejectors applicable for
     engine cooling ,
     <http://naca.larc.nasa.gov/reports/1945/naca-report-818/>* NACA
     Report 818 , 1945 , pp. 19 .

It goes back further than that to the Coanda effect.
An early description of the Coanda effect was provided by Thomas Young
in a lecture given to the The Royal Society in 1800:

Paul Lamar ...No rotor no motor.

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