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Old 5th Dec 2012, 17:02
  #347 (permalink)  
roulishollandais
 
Join Date: Jun 2011
Location: france
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Thank you for that drawing from Leonardo da Vinci !
He did not chose to draw streamlines, nor streamtubes, only vortexes

Last edited by Jetdriver; 26th Feb 2013 at 17:29.
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