Here you can exchange your experience and datas about your home build boards
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downunder
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Postby downunder » Tue Jun 09, 2015 8:23 am
Hi there,
possibly discussed before, so sorry. I am more and more thinking about the 'shark skin' water board surface.
Rough surface. Rough as 200-300 grit sandpaper (maybe more).
My reasoning is that this creates a bigger surface area. Much bigger. It might even create a tiny bubbles below the surface creating a much, much faster board.
I am puzzled with the slippery and rough surface. Which one is faster or better.
What do you think?
D.
PS
http://www.enchantedlearning.com/subjec ... Skin.shtml
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plummet
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Postby plummet » Tue Jun 09, 2015 10:50 am
I don't know man.
But its a question that begs answering.
The idea of a rough surface is to create a boundry layer that then allows the next layer of water to slip by smoother......
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joriws
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Postby joriws » Tue Jun 09, 2015 11:20 am
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chrislandy
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Postby chrislandy » Tue Jun 09, 2015 12:39 pm
a satin / matt finish should be faster than a gloss. A smooth glossy finish is very sticky to water and produces a lot of drag, a non glossy surface (as mentioned) creates a boundary layer between the surface and the main flow of water reducing drag.
This also means the board will be more slippery in the water, less control and any surface contours will have less effect.
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edt
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Postby edt » Wed Jun 10, 2015 8:04 pm
i think you are working the wrong angle, look at swimmers the difference between a regular suit and a shark suit might be a half percent. If you want the fastest board you need to look at the shape not the shark skin, I mean sure yes it can make a difference but differences in board shape and how it rides in the water, wetted surface etc., can give you double speed of a twintip in the same wind conditions. if you haven't yet ridden a race board do it. it's enlightening.
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plummet
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Postby plummet » Wed Jun 10, 2015 11:58 pm
edt wrote:i think you are working the wrong angle, look at swimmers the difference between a regular suit and a shark suit might be a half percent. If you want the fastest board you need to look at the shape not the shark skin, I mean sure yes it can make a difference but differences in board shape and how it rides in the water, wetted surface etc., can give you double speed of a twintip in the same wind conditions. if you haven't yet ridden a race board do it. it's enlightening.
Correct me if i'm wrong. But i think down under is looking for the most efficient surface for his boards.
Not necessarily the fastest board on the planet. If he can optimize the board serface to the most efficient. Then his boards will perform better.
Now.
Riddle me this.
If satin finish was faster why then do america's cup yachts, F1 cars and a wealth of other high performance aerodynamically important craft not have satin finish?
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edt
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Postby edt » Thu Jun 11, 2015 1:39 am
I guess. by the way f1 cars are not that aerodyamic a prius has a coefficient of drag of something 0.3 while an f1 car is about 1.3 something like 4 times worse. It's because the prius has a much more aerodynamic shape even tho the f1 might have a million dollar paint job.
Last edited by
edt on Thu Jun 11, 2015 1:52 am, edited 5 times in total.
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chrislandy
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Postby chrislandy » Thu Jun 11, 2015 8:45 am
plummet wrote:Riddle me this.
If satin finish was faster why then do america's cup yachts, F1 cars and a wealth of other high performance aerodynamically important craft not have satin finish?
racing yachts (including america's cup) do have a satin finish, a lot of them use Durpox clear PU with an additive to create a clear but slightly satin finish.
It's the same principle as why a smooth golf ball doesn't fly straight yet a dimpled one does, it creates it's own little boundary layer of air disturbance on the surface and prevents the air from "sticking" for use of a better word
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plummet
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Postby plummet » Thu Jun 11, 2015 8:57 am
The carbon mutant I built had a gloss finish out of the mold. I rode it like that for months. The scratched the bottom and wet sanded it to a satin finish.
I notice no difference from my gloss to satin finish.
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