Russell Kent wrote:

Paul,
Could you explain the text in the second image? (Hoerner on
ring-type radiators.)  I don't get the letter references, the last
type (d) is never mentioned and has 2 Cda's.

Russell Kent

Like a lot of stuff in Hoerner he does not fully explain it as most
data is from other references. In this case (5)
b) DB wind tunnel report #21 1941 and Zeppelin reports 600/185 1941
and 600/237 1941 

The d) type is called a drum radiator. Kind of hard to make I would
guess. You will need to get the report references to learn more. Perhaps
the Library of Congress have them.

Paul Lamar
 
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