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Old 22nd May 2009, 12:38 AM   #17
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leysenkr can you explain your theory about vortices?
I thought the sharkskin idea was to reduce vortices disturbing the boundary layer, not to create them.

also the lift and drag of varying surface roughness foils is easily tested in a tank- its been done and referenced by Bethwaite who says that polished is better.

what more do you want?
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