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Sail Aerodynamics
This link was posted recently to a racing discussion
http://www.wb-sails.fi/news/470StreamAnim/index.htm# Not sure how useful this is, but the pictures are cool. One of the things I found interesting was the vertical difference in air flow, and the difference in pressure distribution between the main & jib. On the jib, the max pressure differential is much further forward. Also if you look at the photos of the sail, they are much flatter than often said to be ideal (there is no reference to wind speed, it might be light air) and the drafts are aft. Also it shows a vortex off the head of the jib.... now the question is, does a frac rig benefit because the mainsail supresses the jib's tip vortex, or does the jib vortex hurt the drive of the mainsail? This is kind of theoretical, I wich I could actually go sailing but right now everything is covered in snow & ice. Maybe later this week..... Fresh Breezes- Doug King |
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