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  1. #81
    Join Date
    Aug 2011
    Location
    Wilmington
    Posts
    2,340
    Quote Originally Posted by Charles Taylor View Post
    Roy is it possible to use linseed oil to seal the parallel profile boards ?

    I'd be wary of anything that can't seal end grain with 100% confidence. You'd probably have to oil it after every use at a minimum and you won't be able to tell if there is a problem until it's too late.

  2. #82
    Hi Charles yes I don't see why not we use linseed oil on paipos and it seals ok.

    Are you still planning to do a tunnel fin? If so were you thinking of a larger single tunnel? I think that the best way to do larger tunnels is a glass or paper and resin layup as it is stronger than wood. The big single tunnels need to be stronger as they can take a beating, the smaller ones are inherently stronger and are protected by the front and/or side fins.

  3. #83
    Join Date
    Jul 2013
    Location
    York Maine
    Posts
    740
    Images
    5
    image.jpg

    Resin coat

  4. #84
    Join Date
    Jul 2013
    Location
    York Maine
    Posts
    740
    Images
    5
    image.jpg

    Resin coat

  5. #85
    Join Date
    Jul 2013
    Location
    York Maine
    Posts
    740
    Images
    5
    image.jpg

    Resin

  6. #86
    Join Date
    Aug 2011
    Location
    Wilmington
    Posts
    2,340
    I think real Tung oil would be a superior choice.

  7. #87
    Looking good, the rocker looks fine, and will suit a tunnel, or just about any fin setup.

  8. #88
    Join Date
    Jul 2013
    Location
    York Maine
    Posts
    740
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    5
    Quote Originally Posted by Roy Stuart View Post
    Hi Charles yes I don't see why not we use linseed oil on paipos and it seals ok.

    Are you still planning to do a tunnel fin? If so were you thinking of a larger single tunnel? I think that the best way to do larger tunnels is a glass or paper and resin layup as it is stronger than wood. The big single tunnels need to be stronger as they can take a beating, the smaller ones are inherently stronger and are protected by the front and/or side fins.
    I like how the baron surfboard tunnel looks. I was thinking maybe a 10" pipe mold .. So yes I would like a big single tunnel. I'm curious to know more about the laminating / construction to make a good strong one. Also any knowledge on foiling would be very helpful. Thanks

  9. #89
    You could do a big wooden one if it is glassed for strength. The Baron tunnel is made of paper and tinted resin, just cover your mould with masking tape (I put it with the sticky side out ) then layer paper with resin in between (use a brush) until it's about 1/4" to 3/8" thick (lots of layers. 40 plus from memory, and the best paper is absorbent e.g. art paper for water colours) then hold it in place with masking tape around the edges. They can be foiled inside and out or just on the outside, which is easier to do. Both ways work well. I use more than half a cylinder, about an inch extra, so the tunnel is a bit taller than the radius, with a bit extra when laying it up so that it has some tabs to set into the board. They only need to be set in about 1/4" as the structure is so stable. Resin can be tinted with powdered watercolour paint.

    A ten inch tunnel should do the trick, make it about 3 inches long fore and aft, you'll be able to slide it out sideways when surfing in a controlled way if it is pushed hard, which is fun and pretty functional, some small side bites can be added if you want more hold.
    Last edited by Roy Stuart; Jul 18, 2013 at 09:18 PM.

  10. #90
    Foiling wise when using a single in front of the tunnel I use a laminar flow foil, with the thickest part of the chord back at about 45% aft, like the top foiling the picture below, but for a tunnel on its own bring the thickest part of the fin forward to about 30% aft like the bottom picture. The reason for is that with a fin in front of the tunnel the angle of attack of the tunnel is controlled, so a lower drag laminar flow foil can be used, with the tunnel alone it needs the foil proportion more forward as that enables the fin to handle greater angles of attack. I also make a stand alone tunnel a tad thicker for the same reason.

    http://www.boatdesign.net/forums/att...0012_shape.jpg