X-Mozilla-Keys:                                                                                 
Bill Freeman wrote:

    SNIP   to save bandwidth

  Otherwise

one gets lower cooling drag, but greater airframe form drag. As in all things
associated with aircraft, it is a tradeoff.

Fred Moreno

Excellent post, good summary  of a complex issue.  
We occassionally forget  that for
an already blunt body, external diffusion is very efficient, and
large inlets can still be low drag,  like your Bonanza example.  
Once I finally understood
external diffusion, many cooling systems became much clearer to me. People seem
to get internal diffusion more readily, and if they understand external
diffusion when explained to them, they seem to easily forget it 
and fall back on only internal diffusion.

Bill

 
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