I?ve downloaded the NACA Submerged Inlet Data drawing provided by I believe, Mark Langford, but after working all night I?m having some trouble understanding the direction of airflow through the duct. For explanation ease let?s consider an airplane flying left to right with the airflow right to left over the fuselage. To act as an inlet, does the narrow, shallow end point into the airflow? Conversely, to use as an airflow exit duct does the broad end face forwards?
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