In article , Dan Nafe
wrote:

Air cooled engines (in aircraft, not submarines) are lighter and less
complex to operate than liquid cooled engines.

WRT the weight...is that really true?
IME building liquid-cooled and air-cooled systems, the Liquid systems
are often lighter. Of course while glycol weighs more than air, usually
more aluminum is needed in an air-cooled system than in a liquid-cooled one.

--
Harry Andreas
Engineering raconteur