Snip: it is a shame that we can't have

a purpose-built air-cooled aircraft rotary.

Mark Wrathall wrote
Is is realistic to expect to reject the waste heat load of a 200 hp rotary
through air cooling? The engine is so compact where would you add the
required finning?

That is a very good point.

Paul Lamar

Moller tried in the late 80's to make a two rotor air cooled.  It failed
because the "back" rotor overheated.  It might be possible to design a
complex fin system (they were working on one) or go more circumferential
but it is not as easy as "air cooled submarines"  Such is the case with any
high specific output engine.  BTW, how do you air cool the center housing?

Jeff Spitzer

 
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