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Old 21st May 2009, 07:38 PM   #9
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how do smooth surfaces cause vacuum?
and what surface finish causes the right vortex's to reduce friction?
and how does the presence of vortices reduce the friction and where on the foil? leading edge, somewhere after seperation bubble?
how about polished leading edge to delay seperation, then sanded somewhere after to aid reattachment of the seperation bubble?
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