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Old 21st May 2009, 05:19 PM   #8
Join Date: Aug 2008
Location: Belgium
Posts: 69

Irregularity causes vortexes like a swimsuit with sharkskin. Vortexes causes less friction than smooth surfaces. Smooth surfaces cause a vacuum and this is the friction in the water. But irregularity doesn't mean that every irregularity is good. What is smooth? What looks like smooth can look very rough under a microscope.
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