The bottom bell curve opens up too fast as it progresses towards the
radiator.  You'll get flow separation and perhaps even a bubble (cylinder)
of turbulence that blanks from 1/3 to 1/2 of the radiator.

Chris C.

That is interesting Chris.  I was going to say that looked like the best
part of his duct. It jibes with modern thinking on rad ducts from 
Kuchemann & Weber and even Hoerner for that matter. Look back in old messages.
We discussed this very extensively indeed. When did you come on board? 

Paul Lamar
 
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