Hollow Wooden Surfboard - My Magic Carpet

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Introduction: Hollow Wooden Surfboard - My Magic Carpet

Welcome to my first instructable. I've made a few wooden surfboards so thought I would share my favourite. It's 7'6 x 21" x 2"3/4 magic carpet design, a mellow cruiser good for lazy days and lazy waves.


Plans link:

https://www.dropbox.com/s/30ky3c3vte4nw5q/7%276%20...

Step 1: Glue the Pattern to the Plywood

So, there are places online where you can buy the plans, or you can design your own. I use a program called AKU. Using this you can create designs pretty quickly. For wooden boards you need to create slices every 150mm that define your ribs. The central spine is the side profile. The outline is your final planshape. Think of it as a fishbone with a spine and ribs that you then build the decks and rails around.
I then use a program called hollow board template maker that generates a PDF of the spine, ribs and outline. Print out at full size and using spray mount stick onto 4mm plywood.

The whole build thread is here: also, with lots of cool surfboard projects
http://www.grainsurf.com/forum/viewtopic.php?f=11&t=5532


Step 2: Cut the Frame

I use a bandsaw to cut out all the frame parts, then dry fit it together. As the design fits onto a 1200x2400mm sheet you can get the frame and the whole bottom deck out of one piece of ply. Sit the frame onto the bottom deck and draw on the rib and spine positions. This is your guide for where a bead of PU glue will go. For this build I used little blocks of balsa wood that keep the frame straight and the ribs 90deg to the spine.

Step 3: Glue the Frame to the Plywood

I made a clamping frame using 3x2 timber, threaded bar and some nuts and penny washers. You'll see how it works but the idea is the board is clamped every 200mm between two strips of ply that can be adjusted to fit the top and bottom rocker of the board using the threaded bar and some nuts.
Bead the PU glue onto the bottom deck, fit the frame and clamp in place.

Time taken so far about three hours - relax till tomorrow while the PU glue cures.

Next add the chine strip - 6x6mm stripwood. This glues into place into notches cut on the rib ends and gives you the outline shape. I'll add the rail strips next, but first some hardware considerations.

Step 4: Fin Box Support

At the tail of the board I add some scrap foam floor insulation blocks. These form support for the finbox and the leash plug when they get holes routered in place and glued in later on. There is also a vent to fit to the frame - for this I use a brass insert pressed into a wooden block then glued to the spine to fit flush with the underside of the deck. As the board is hollow, the air inside can expand and burst the board on a hot day. Using a vent means you can equalise the pressure so the board doesn't suck air in or blow! The vent will be sealed up with a brass bolt and rubber washer.

Step 5: Cut and Glue the Deck

Next I cut the strips for the top deck. These need to be 6mm thick and ideally longer than the board so no scarfing needed. I used some reclaimed western red cedar and pine. The nail stains will look good. The strips can be edge glued using titebond 3 and masking tape. I glue up in twos and threes - no need to do the whole deck in one piece.

Step 6: Rail Strips

Cut some 6x6mm and 6x12mm strips - these get glued to the ends of the ribs to form the rails using any clamping method you can use. Like the drainpipe clamps? Cut an inch off a drainpipe, cut a slot and you have a clamp. I have a box of about 40. You need a lot of clamps for rails. Glue up one strip at a time, using a plane to bevel the strips and taper at the ends. PU glue helps full any gaps you have.

Step 7: Top Deck

Now we add the deck, a strip or two at a time. You need to trim each deck panel to fit against the rails using bandsaw and plane. Glue using PU and don't forget about the vent!

Step 8: Ready for Final Shaping

Once you have it all glued up and cured its ready for shaping. The deck strips take about four or five days to shape and glue. Reckon on an hour or so per panel plus overnight cure time. Now comes a lot of sanding - I use a belt sander and take care to work evenly around the board. Step back and eyeball regularly to keep it symmetrical. Measure, look and measure. This is also the time when you realise the board rattles and you can't find you pencil.

Step 9: Seal the Top

Here's where it gets a little crazy. I seal the top deck using resin research epoxy having masked out the rails. I'm going to do a Mexican blanket resin job on the bottom (crappy ply) and leave the wood exposed on top. This is where the colour of the grain POPs and you see what you have. The positive negative stripes have come out well.

Step 10: Glassing

I have my design worked out and taped to the wall. I add a layer of 4oz fibre glass weave to the bottom and tape in place. The top is masked out. Next I mix up the pigments and resin batches. I'm using polyester resin so add 5ml pigment into 100ml resin and mix well. Do not add catalyst yet! Put gloves, respirator and goggles on, get your squeegee ready and catalyse the first colour. Pour across on bands, then choose the next colour and repeat.

Step 11:

Step 12: Glass the Top

Trim the rail laps with a very sharp blade when the resin loses its tack but is not fully cured. Leave overnight to cure then glass the top. I've added my pinlines (vinyl car stripes from eBay and they are self adhesive) and logo laser printed onto rice paper and laid under the glass. Leave to cure then gloss coat both sides. Polyester resin again but adding wax in styrene so it cures smooth and non tacky. You'll see I already fitted the leash plug and sealed up level with plasticine before glassing - you can open these up afterwards with a Dremel.

Step 13: Pinline and Finbox

Add the pinline before the gloss then router out the finbox slot. The finbox gets glued in with a paste if fibreglass and resin. For the leash plug use a forstner bit and glue in the same way.

Now just the sanded finish to do - wet and dry paper from #400 right up to #1500 and we're done.

Step 14: Done

Step 15: Here's Some Others

Woodworking Contest

Runner Up in the
Woodworking Contest

6 People Made This Project!

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110 Comments

0
davide.ponzetti
davide.ponzetti

5 months ago

Hi Mike, I'm working on your surfboard 7.6 design, it's growing good, pls, I have a question, you didn't use fiberglass is it right? You use only epoxy resin. Could you confirm isn't it (fiber glass) necessary? Tks, regards, Davide

0
mike_skinner
mike_skinner

Reply 5 months ago

Glad to hear its going well! Yes, I do fibreglass, a single 4oz layer top and bottom, cutlap on the top (disguised by the stripe) and epoxy resin

1
davide.ponzetti
davide.ponzetti

Reply 2 months ago

Hi Mike tks for your guide, below my board in Ayous wood, next one will be in Paulownia. Soon as I can test in in the sea I'll send you my preferred spot picture, ciao

WhatsApp Image 2021-03-24 at 13.51.20.jpegWhatsApp Image 2021-03-24 at 13.51.21.jpeg
0
mike_skinner
mike_skinner

Reply 2 months ago

Mate that looks AWESOME! I have a little paulownia too but keeping it for a longboard sometime soon!

0
jdelgrande
jdelgrande

1 year ago

Looking to start this board. Any idea how I can print the template in full scale on multiple different pages?

1
davide.ponzetti
davide.ponzetti

Reply 5 months ago

Hi jdelgrande, you can do that with the function "poster" of Acrobat, take care of check the printing is exactly what is expected before to work on the wood.

0
PedroD22
PedroD22

Question 1 year ago

Hi,

Great project. What's the volume and weight of the board?

Cheers

0
mike_skinner
mike_skinner

Answer 1 year ago

Weight depends on the timber you use and the glass job - I used 3mm plywood, pine and cedar so it ended up about 7.5kg. That’s with single layer 4oz cloth double lapped at the rails. You could go lighter using paulownia but it’s very expensive in the U.K. and hard to get. Volume - I think about 68 litres.

0
Gixxer_jack
Gixxer_jack

Question 2 years ago

Hi, I’m wanting to start building this, I feel confident up to building up the rails and applying the top deck, do you have more pictures of the process of how it’s done?

In my mind surely as you start building the rail around the rib, when you get to a certain point on the rib it will create a bit of a step? Or does this get reduced down so it’s flush? Sorry if that doesn’t make sense I can draw an image of what’s confusing me later if that makes it easier

0
mike_skinner
mike_skinner

Answer 2 years ago

You are right with the first method - add rail strips until the tech panels can butt up tightly against them. If you want a bit of extra strength then you can add another bit of material under the join. A lot of people do the second way and feather the rails - I’ve never done this as the butt method gives a super clean line particularly if you are using contrasting words colours. Good luck and feel free to post questions here or shoot me an email mike.skinner1001@gmail.com
Good luck!

0
msommer1
msommer1

Question 2 years ago on Step 2

Hey Mike...Thank you for your email. Was not sure how those parts came together...It all makes sense now. Just one more Q. The "ribs" which on the plans have a round ends, you seem to have cut, looks lie a square bit out...Would I be right to assume that is the case for the strip of wood that comes all the way around?

0
mike_skinner
mike_skinner

Answer 2 years ago

That’s right - this is a 6mm x 6mm strip that forms the chine. The first outer rail strip glued to this then you build up from their. If you google “chine strip” or “chine rail” then you may well find more images. Good luck!

0
msommer1
msommer1

Reply 2 years ago

Thank you mate, this explains a lot. Cheers...

0
msommer1
msommer1

Question 2 years ago on Step 2

A quick Q...I downloaded this plan but while looking at the photos I noticed two more parts which are not in the template. The nose and the tail bits. Are those just following the contours of the base?

0
mike_skinner
mike_skinner

Answer 2 years ago

Yes! Make those parts 15mm thick then the outside edge follows the outline of the nose and tail. Good luck!

0
AlbertoP107
AlbertoP107

2 years ago

it would be enough to build with 5mm

0
FranciscoG160
FranciscoG160

Question 2 years ago

Good afternoon, could someone spare me template for print (printable template) pdf preferably 8 ft malibu or biger
Thank you(francisco30jft@hotmail.com)

1
Dirruk
Dirruk

Answer 2 years ago

This is where BoardCAD comes in. It is free and easy to use. 8ft sounds like a mini-malibu. Anyway, here you go...