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I personally want to know results for both perpendicular and parallel flow. Any surface you create is never going to be perfectly perpendicular or perfectly parallel to the airflow so its important to me what happens on both ends and in between. Anyway...
Good find on the hood article, I think we're getting somewhere now. The fan article I don't find particularly useful; I think to complement the hood article we need something that shows how much air goes through at what speeds/pressures, and most importantly, how much drag is created.
Remember, I said from the beginning I don't doubt that more flow will be blocked at higher airspeed. The question is, what if you're adding some ridiculous amount of drag that completely negates the benefits?
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