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-   -   could this be of any use to board/fin design? (http://www.star-board-windsurfing.com/forum/showthread.php?t=8502)

Unregistered 31st March 2010 02:49 AM

could this be of any use to board/fin design?
 
http://www.msnbc.msn.com/id/35954556...ience-science/

joe_windsurfer 31st March 2010 06:01 AM

.
maybe that was the intention of the F2 air tubes ?
except they put in air
perhaps water injection would be better ?

kiwiben 31st March 2010 10:14 AM

This is not rocket science folks... Okay maybe it is... but I am sorry to report that it cannot help us because there is no turbulence around a windsurfing fin.

Actually I just made that up... but I think the stuff in the article is concerned with "gross turbulence" caused by a fairly inefficient shape... not the micro, nay, nano-turbulence you could imagine goes on at the surface of a fin when some nerd has devoted his/her life to eliminating every last shred of turbulence from it.

But at the risk of being a dream stealer, could you imagine little tiny water pipes firing little nano-jets of water out of the leading edge of the fin? I suppose it is possible but I think the fin would cost about twenty grand... but then again, as they say: If you build it, they will come!

However, there is another way of adding turbulence, the so-called shark-skin effect (so called by me just then)... Sharks have rough skin, and scientists discovered to their amazement that shark skin generates less turbulence (or maybe that should be drag or friction)) than the smooth skin of, say, a dolphin. Their theory was the little nano turbulences created by the tiny roughnesses meant the actual water could never properly "Grip" the surface to get any major turbulence resonating. I think Dennis Connor gave his Americas Cup yacht a rough hull once going on this concept. I wonder if any W/S designers have explored a roughened bottom surface. If they did, it didn't seem to catch on...

Farlo 31st March 2010 07:07 PM

Sorry to interfere but it is rocket science. Hull or fin surface can vary from polished to matte to rough and there is no definitive answer about what is best (notwithstanding what "best" means). Most probably it depends on many other parameters. Nanostructured materials are an interesting breakthrough as water hardly touch them, there is no surface energy or boundary layer in the classical sense. But there are probably too expensive/fragile for windsurf.


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