Introduction: Plywood Kiteboard

About: Eric J. Wilhelm is the founder of Instructables. He has a Ph.D. from MIT in Mechanical Engineering. Eric believes in making technology accessible through understanding, and strives to inspire others to learn …

Unsatisfied with commercial kitesurfing boards, I decided to make my own. I found the commercial boards to have too much rocker, too many fins, stupid graphics, and, worst of all, too high a price tag. With $50 worth of marine grade plywood you can build a board that will drop the jaws of all the board-shorts-on-the-outside-of-their-wetsuit types as you scream upwind.

Step 1: Design Your Board

I learned to kitesurf on a rectangular board, 16 x 60 inches. Nearly anything of this same approximate surface area will work. My current favorite board (which has lasted more than two years now) is a perfect oval 62 x 16 inches. The holes for the footstraps are set 1 inch forward of the centerline. My feet naturally sit about 22 inches apart, so I set the 7.5 inch wide footstraps 22 inches apart. I also put in a hole for a leash.

In this files section are two CAD files (DXF and Corel Draw) of my favorite board.

I printed my design out on a large format printer. You can also just draw your design my hand on a large sheet of paper.

Step 2: Cut Board

Transfer your shape to marine plywood. I think 3/8 inch thick Baltic Birch is the best choice. Unfortunately, I've only been able to find it in 5 x 5 ft sections, so you can't make a board that's insanely long.

Rough cut the shape with a table saw or jig saw, and then smooth the edges with a belt sander. Round any sharp edges so the board doesn't cut you, but also so it's not prone to knicks and dents that will allow water through the epoxy.

Make sure you align the grain of the wood on the face of the plywood along the direction of the board.

Drill holes and install 1/4-20 tee-nuts for mounting footstraps and a leash attachment point.

Step 3: Board Size

Step 4: Install T-nuts

Step 5: Print Graphic

Step 6: Lay Up Fiberglass

Step 7: Epoxy Board and Apply Graphic

Brush on a thin coat of epoxy. I used US Composites 635 thin coat. Once the first coat is dry, which will probably take overnight, sand it smooth. 200 or higher grit should work fine. Use lower grit on any drips. Clean up the dust with a damp rag.

Printout your graphic on plain white paper. Once soaked with epoxy, the paper becomes translucent and the wood grains shows through.

Brush on your second coat. Immediately, roll your graphic onto the board and use a stiff edge to carefully smooth it against the board. Brush more epoxy on top of the graphic.

Step 8: Peeling Graphic

Step 9: Cure Epoxy

Step 10: Trim Fiberglass

Step 11: Sand Edges

Step 12: Clean Out T-nuts

Step 13: Make and Install Foot Pads

Use closed-cell foam to make wacky, giant feet footpads. Glue them to the board with rubber cement. Install the footstraps and place a handle between them for carrying the board, and for awesome board-off tricks!

Step 14: Ride

You are now ready to ride!

Throw caution to the wind and go crazy with huge jumps knowing your plywood ride will shoot you back upwind.

Laugh at people on the beach who spent $700 on their board and who feel compelled to tell you, "that won't work."