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  1. #31
    Quote Originally Posted by ClemsonSurf View Post
    What size dimples are the most effective, larger or smaller? I was thinking about this and wondered if you would get a similar "dimples" type result if you didn't hot coat the bottom of your board. Would the slight depressions from the weave act as dimples?
    Look no further then the skin of the mako shark. saw some discovery science type of show explaining how the mako shark's skin traps tiny tiny water molecules thus creating a water on water surface allowing it to travel with reduced drag. I think the closest thing we can get to that on a surfboard is very fine grit sandpaper rubbed back and forth on the bottom of the board, not side to side.

  2. #32
    The optimal grit size depends upon the speed. I use 400 grit blending into 600 in the tail.

  3. #33
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    Quote Originally Posted by ClemsonSurf View Post
    What size dimples are the most effective, larger or smaller? I was thinking about this and wondered if you would get a similar "dimples" type result if you didn't hot coat the bottom of your board. Would the slight depressions from the weave act as dimples?
    The weave might act as dimples, but you wont have long to enjoy the effect, as the board falls apart.

  4. #34
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    Quote Originally Posted by MFitz73 View Post
    Look no further then the skin of the mako shark. saw some discovery science type of show explaining how the mako shark's skin traps tiny tiny water molecules thus creating a water on water surface allowing it to travel with reduced drag. I think the closest thing we can get to that on a surfboard is very fine grit sandpaper rubbed back and forth on the bottom of the board, not side to side.
    I'll remember that next time I'm hanging out with a mako shark....

    I think I read somewhere that the indentations or dimples would essentially trap air reducing drag by cutting the viscosity (right term?) of the water.

    Speaking to you and Roy, the fine grit sanding doesn't add any dimples. I think this thread was comparing dimples on a board to something like dimples on a golf ball.

  5. #35
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    Quote Originally Posted by scotty View Post
    The weave might act as dimples, but you wont have long to enjoy the effect, as the board falls apart.
    Why? You could saturate the weave with enough resin to make it pretty strong. The hotcoat definitely adds strength and continuity to the total strength of the board but it's pretty strong with the resin/weave combination.

  6. #36
    Quote Originally Posted by ClemsonSurf View Post
    I'll remember that next time I'm hanging out with a mako shark....

    Speaking to you and Roy, the fine grit sanding doesn't add any dimples. I think this thread was comparing dimples on a board to something like dimples on a golf ball.
    the dimples would have to be miniscule (think NJShredmachine's biceps)... how would you go about creating that? I think golf ball dimples would not trap the water molecules but just give the water something to get slowed down on instead.
    I guess maybe you could glass your board, then get a surfboard sized fine grit sand paper and layit ontop of the glass job while it dries??? then maybe you'd have tiny enough dimples. but that probably wouldnt work.
    Last edited by MFitz73; Apr 24, 2013 at 09:04 PM.

  7. #37
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    Quote Originally Posted by ClemsonSurf View Post
    What size dimples are the most effective, larger or smaller? I was thinking about this and wondered if you would get a similar "dimples" type result if you didn't hot coat the bottom of your board. Would the slight depressions from the weave act as dimples?
    Straight from the horses mouth... Mike Daniel:

    I know that the golf ball analogy is going to be used, but it's not applicable in a strict sense. Tripping the boundary layer on a golf ball reduces the drag on a sphere moving through air, by allowing a smaller ''wake'' behind the ball. On a planing surface the effect is a little different. Any planing surface is going to have transition points between laminar (no boundary layer) and turbulent flow. We are just tripping the boundary as soon as possible. All our feedback from testing and initial customer reports indicates it's working.

    As usual, we're not going to do any big claims. We'll just let the surfboards do the talking.

  8. #38
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    Quote Originally Posted by MFitz73 View Post
    Look no further then the skin of the mako shark. saw some discovery science type of show explaining how the mako shark's skin traps tiny tiny water molecules thus creating a water on water surface allowing it to travel with reduced drag. I think the closest thing we can get to that on a surfboard is very fine grit sandpaper rubbed back and forth on the bottom of the board, not side to side.
    Very good observation Fitz, however, Mike Daniel answered this question as well...

    "it wasn't sharks that specifically inspired Kick. I have to plead the fifth past that."

  9. #39
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    Quote Originally Posted by ClemsonSurf View Post
    Why? You could saturate the weave with enough resin to make it pretty strong. The hotcoat definitely adds strength and continuity to the total strength of the board but it's pretty strong with the resin/weave combination.
    It might be "pretty strong" but i believe a board glassed and not hotcoated would be really prone to water seepage through the weave, small punctures, and real significant dents if you wiped out and the bottom of the board took an elbow.

    Ever pick up a board thats only been glassed and not hotcoated? They are pretty fragile.

  10. #40
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    Quote Originally Posted by scotty View Post
    It might be "pretty strong" but i believe a board glassed and not hotcoated would be really prone to water seepage through the weave, small punctures, and real significant dents if you wiped out and the bottom of the board took an elbow.

    Ever pick up a board thats only been glassed and not hotcoated? They are pretty fragile.
    Noted... I have to admit, my only experience with a board that wasn't hotcoated was my HWS which is naturally harder and stronger than foam. Good point on the punctures/seepage thing.

    DawnPatrol, so what was Mike Daniels saying? They're not using golf ball style dimples but didn't say what they are using.