Contact   Imprint   Advertising   Guidelines

The fastest board surface possible with DIY

Here you can exchange your experience and datas about your home build boards
User avatar
downunder
Very Frequent Poster
Posts: 2814
Joined: Mon Jul 01, 2013 7:16 am
Gear: building my own
Brand Affiliation: None
Location: Perth, Australia
Has thanked: 153 times
Been thanked: 160 times

The fastest board surface possible with DIY

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

plummet
Very Frequent Poster
Posts: 6819
Joined: Sat Aug 29, 2009 11:25 pm
Local Beach: EE
Favorite Beaches: NZ
Style: Terrain riding
Gear: Old wornout ozone.
Plummet hydrofoil and mutant
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 224 times

Re: The fastest board surface possible with DIY

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......

joriws
Very Frequent Poster
Posts: 1299
Joined: Wed Nov 24, 2010 11:03 am
Gear: Flysurfer, HQ, Moses, Nobile, North, Ozone
Brand Affiliation: None
Has thanked: 76 times
Been thanked: 163 times

Re: The fastest board surface possible with DIY

Postby joriws » Tue Jun 09, 2015 11:20 am

Or nano-coating to reduce friction.. Following links are just examples quickly googled..

1: http://www.surfnanoproducts.com/SurfNan ... aspx?PID=6
2: http://www.nanotunenow.com/nanotune-online-shop/

chrislandy
Rare Poster
Posts: 39
Joined: Wed Apr 02, 2014 6:48 pm
Gear: Wakeboard
Brand Affiliation: None
Has thanked: 0
Been thanked: 0

Re: The fastest board surface possible with DIY

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.

User avatar
edt
Very Frequent Poster
Posts: 7316
Joined: Fri Jul 16, 2010 6:27 am
Kiting since: 2010
Local Beach: Michigan
Gear: ride hard, no regrets
Has thanked: 530 times
Been thanked: 664 times

Re: The fastest board surface possible with DIY

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.

plummet
Very Frequent Poster
Posts: 6819
Joined: Sat Aug 29, 2009 11:25 pm
Local Beach: EE
Favorite Beaches: NZ
Style: Terrain riding
Gear: Old wornout ozone.
Plummet hydrofoil and mutant
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 224 times

Re: The fastest board surface possible with DIY

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?

User avatar
edt
Very Frequent Poster
Posts: 7316
Joined: Fri Jul 16, 2010 6:27 am
Kiting since: 2010
Local Beach: Michigan
Gear: ride hard, no regrets
Has thanked: 530 times
Been thanked: 664 times

Re: The fastest board surface possible with DIY

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.

User avatar
cleepa
Frequent Poster
Posts: 353
Joined: Fri May 17, 2013 4:43 am
Brand Affiliation: None
Has thanked: 0
Been thanked: 2 times

Re: The fastest board surface possible with DIY

Postby cleepa » Thu Jun 11, 2015 1:45 am

Finish on the board is important.
http://boardlady.com/fast.htm

chrislandy
Rare Poster
Posts: 39
Joined: Wed Apr 02, 2014 6:48 pm
Gear: Wakeboard
Brand Affiliation: None
Has thanked: 0
Been thanked: 0

Re: The fastest board surface possible with DIY

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

plummet
Very Frequent Poster
Posts: 6819
Joined: Sat Aug 29, 2009 11:25 pm
Local Beach: EE
Favorite Beaches: NZ
Style: Terrain riding
Gear: Old wornout ozone.
Plummet hydrofoil and mutant
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 224 times

Re: The fastest board surface possible with DIY

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.


Return to “Gear Builders”

Who is online

Users browsing this forum: Brent NKB and 139 guests