According to to Kuchemann & Weber's book "The Aerodynamics Of
Propulsion". This is what the test duct should look like.

If you want to get real trick I have the curve coordinates.

Just behind the radiator the duct should be stright for 
a distance. The exhaust nozzle is optional and can be tested
with or without.

The probes facing forward are velocity probes. The reference
pressure should be room pressure.
 
Paul Lamar    neil.gif
 
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