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Old 03-30-2009, 07:06 PM   #8 (permalink)
aerohead
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Ford of Australia created a grill in the 1980s which behaved as you describe.As velocity increased,the airfoil sections which made up the grill would begin to stall.The turbulence created a formidable barrier to increased flow volume,effectively pinching off the airstream to the required minimum.
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