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'swallows'
In order to reduce drag, it would have to be 'airtight' ( like the Airflow ), and it's cross-sectional area would have to diminish very gradually over it's length, in order not to produce an 'over-allowable' pressure increase. Other wise, the flow would separate, and it's game over.
Only non-ventilated cavities are capable of producing drag reduction.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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