Minor break through here. This is about the best information
we have so far. Much thanks to David Lednicer
for faximg me this information from 
Kuchemann & Weber's book "The Aerodynamics Of Propulsion". 
If you build your duct with these coordinates and
minimise direction changes you probably cannot go far 
wrong.

We are not out of the woods yet as there still is 
the question of what happens when differing flow restrictions
in the form of the radiator are indroduced.

The coordinate chart is for four different ratios
of opening size to radiator size. Namely 25%, 30%, 40%
and 50%.

The x/Yn numbers are percentages of duct length similar
to what we are familar with in terms of wing coordinates.

This is a two dimensional duct in that the roof and 
floor follow these changes while the sides are parrallel
and stright.

Alpha max is the max angle of the roof and floor.
 
Paul Lamar
 
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