Rick Girard wrote:

Paul, You've mentioned in the past that Kuchemann & Weber recommended a
bell shaped duct for optimum flow.  Is the sketch "KM-good-duct-thick"
representative of their work?

Rick Girard

Yes! Here are the coordinates for a theoretically perfect duct.
Unfortunately we rarely have room for a simple axial symmetric
duct so this is of little use. Most of our ducts are what
are known as oblique and a simple wedge shape works pretty
good as shown in this picture. That is Jim Moser in the base ball cap.

Paul Lamar
 
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