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

My 230 Hp Continental rejects it's heat thru the aluminum fins on
the heads, ( cyls do near zip) which have an area at least the same
order of magnitude as the external area of the rotary.  Might be
a bit difficult, but smaller rotaries are done. Also remember it is a
GOOD thing that the oil cooling is about 1/3 of the total (water +
oil) cooling load, this means less to go to the fins.  I would be
surprised if it were impossible.  IIRC the super tiny, very high
output rotaries that Jeff designed were air cooled.  I think they had
a much higher package density.  Jeff?

Bill

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