Alfonso Lebron-Berges wrote:

Paul, this is the URL. It is still active.

http://www.inforamp.net/~raac/CoolingSystems/Part1/CoolingSystems1.HTML

When I navigated through the different parts of the site, the facts
shown, based on what seems to be hard historical data, made a lot of
sense to me.

As I have said previously, I am not an aerodynamycist. I am a
physician but can not subtract myself from the rigors of analyzing
data as critically as possible before accepting it.

It did shock me to read your response but I appreciate it and guess
that you should know a gazillion times more than me about this
subject. Furthermore, if you could elaborate more on the obsolescense
of this I think it would be of great value not only for me but for
all of the others. Not everybody in this list is an engineer.

Please feel free to post this response to the list. I think that we
all will benefit from open discussion. Thanks for planting the seed
of doubt. At least I applied the brakes before falling in moving
sands.

Keep the good work up.

Alfonso Lebron-Berges

The fact of the matter is these pre WW II duct shapes shown on this web site
are wrong as was discovered during WW II by several researchers.
Kuchemann & Weber book Aerodynamics of Propulsion and Hoerner 
book Fluid dynamic Drag among them. Most published in the 50's.

Ironically a simple low cost device like a water manometer was used
to prove it.
 
Paul Lamar
 
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