VMAZDA@aol.com wrote:

QUESTION?
If you need to put the naca duct in center line with the air flow would you
have to do the same if you turned the duct around backwards and used it to
exhaust air. I plan to do this for getting rid of some of the air away from
the engine.
VMAZDA

I am not sure if it would work backwards. It might. A cowl flap with
a nice exit radius  would work better.
 
Paul Lamar
 
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