Paul:



Considering the size and power range of any turbine used in a compound
engine, the radial inflow turbine is probably more desirable than an
axial or impulse design.   As you well know, this is essentially what is
used in a turbocharger and the Solar T62 series of APU turbines.  It is
much more tolerant of varying exhaust gas mach numbers and it’s
certainly less expensive to manufacture than a comparable impulse or
aerodynamic axial flow turbine.    By the way, from the photo I just
saw, it appears the 3350 is an impulse type turbine.


George Lazik




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