8' Folding Kayak

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Posted in OutsideBoats

Introduction: 8' Folding Kayak

About: I get restless, so I make things.

I made an 8' Folding Kayak for around $100 based on plans by Jess E. Rathburn originally published in Popular Mechanics in 1963. The plans have been modified by multiple people and instructions are available online for free in various locations:

http://www.vintageprojects.com/boats/folding-kayak.pdf (original plans)
http://www.ida.net/users/tetonsl/kayak/
http://www.vhcbsa.org/camping/kayak.pdf
http://www.duckworksmagazine.com/00/DM1999/articles/foldingkayak/index.htm

I've attempted to gather the most helpful tips and modification from each set of plans.

The kayak is made of plywood and canvas, and is bonded together with contact cement. The entire boat is coated in latex primer and paint, which waterproofs it. It folds up for easy storage, and is relatively easy to carry short distances.

Step 1: Gather and Prepare Materials

These are the materials you will need to make one kayak:
  • 2 - 1/4" 4' x 8' Sheets Untreated Plywood, smooth on one side
  • 1 piece wood lath
  • 1" x 2" wood for seat support rails (about 2' - 3')
  • Exterior Latex Primer
  • Exterior Latex Paint
  • 200" Heavy Canvas, untreated
  • Waterproof Wood Glue
  • 2 - 2" Screws and Matching Nuts
  • Heavy Duty Velcro
  • Contact Cement (the strong stuff that creates fumes that will explode without good ventilation!)
  • 6 or more - "C" Clamps

One of the sheets of plywood must be cut into four 1' x 8' pieces, the home improvement store will likely make these cuts for you for free if you ask.




Step 2: Cut the Wood, Paint the Interior

One of the sheets of plywood must be cut into 4 - 1' x 8' pieces.

Clamp two of the pieces together (good sides of the wood touching) to cut the cockpit opening. The cockpit opening should start around 41" from the front of the kayak, and can be whatever shape you'd like. The cut should have a depth of about 5", and be about 28" long. See the attached photograph.

Now you get to decide what your kayak will look like. Clamp all four pieces of wood together; clamping the wood together will ensure your cuts match and the kayak is symmetrical. Round the edges of the kayak creating whatever shape you'd like. Don't make the front and back too pointy, or it will be hard to attach the canvas later. We left two inches flat on each side. See the attached photos for a better explanation.

Tape the wood where indicated in the second photo, wood strips will be installed here, and will attach to unpainted wood more securely. Prime the inside of the kayak with a exterior latex primer.

Paint the inside of the kayak with at least two coats of a flexible exterior latex paint. Porch and Floor Exterior Paint worked well, and was in the cheap-o mis-mixed color table for $5.

Step 3: Make Spacers and Spreaders

2 Spreaders
Cut 4 - 11" x 24" pieces of 1/4" plywood. Each spreader will consist of two 1/4" pieces of plywood bonded together. Using wood glue and "C"-clamps, bond the wood, creating two 1/2" thick rectangles.

Cut the spreaders to the dimensions specified on the attached photograph. The center of the spreaders can be cut out to reduce weight.


2 Spacers
The spacers will be used to hold the kayak pieces together and in the correct configuration during application of the edge canvas. Scrap wood can be used to make these.

Cut 2 - 3" x 3" pieces of plywood (dimensions are critical).

Cut 4 - 2" x 6" pieces of plywood (size of these is not as important).

Drill a hole through the center of all pieces of wood. Sandwich the 3" x 3" pieces of wood between two of the 2" x 6" pieces, attach with 2" screw and matching nut.

Step 4: Prepare the Canvas, Cut and Assemble Kayak

The kayak will be assembled using 5 strips of canvas of the following dimensions:

2 - 4.5" x 46"
2 - 4.5" x 72"
1 - 13' x 12" (this may vary, don't cut this one until step 6)

Draw outlines of the strips on the canvas. Paint the canvas with two layers of contact cement, allowing cement to dry between applications, before cutting. Applying the contact cement before cutting will prevent the edges from fraying.

Assemble the kayak with the spacer blocks according the the attached photo. Draw a line 2" inches in from the edge, all the way around the kayak. Apply two coats of contact cement to the 2" marked border, allowing to dry between applications. Repeat on the bottom of the boat. 

Apply canvas strips using the 2" marked line as a guide. The shorter strips are applied to the front and back of the boat, the longer strips on the sides. Stretch the canvas, and apply slowly, smoothing wrinkles as you go. After each strip has been fully applied to one side, flip the kayak over and apply the remaining canvas to the bottom.

The strips will overlap, apply contact cement on the canvas where the overlap occurs, and secure.

This is the most difficult part of the kayak assembly, it requires patience. This step is easier with two people.

Allow to dry for at least several hours before installing the spreaders.

Step 5: Install Stop Blocks

Eight stop blocks will hold each spreader board in place. The spreader board will pop into place between the stop block.

Cut 16 stops blocks from wood lath. Mine are about 1.5" x 1.5".

Determine where you would like your spreader boards to be positioned by installing them and getting in your kayak. I installed mine 22" from the front of the kayak and 22" from the rear, giving me enough room to sit with my legs extended.

Install stop blocks using waterproof wood glue. These will be installed on the unpainted sections of the inside of the kayak.

Step 6: Install Center Canvas

Install the spreader boards. Measure the largest gaps, at the front and end of the cockpit. This will determine how wide your center canvas strip will be.

You should add  4" to the largest gap to allow for at least two inches of canvas glued to the wood on each side. The strip will be approximately 13' long.

After you cut your strip out , center the strip and clamp it onto the kayak. Mark the canvas at the front and back of the kayak. Taper the canvas in these two spots to match the width of the front and back of the kayak. See attached photo.

Install the canvas with clamps again, and draw an outline around the canvas on the kayak. This will be your guide for contact cement application.

Apply two layers of contact cement to both the canvas and the kayak, and apply starting at either the front or the back.

Step 7: Assemble and Install the Seat and Seat Rails

The seat consists of two pieces of plywood, joined with a canvas hinge. The seat sits on 2 rails that are glued to floor of the kayak. The seat is attached to the kayak with velcro.

Cut two rails from 1" x 2" piece of wood, mine are about 17" long. Attach these to the floor of the kayak on the unpainted sections.

Cut two plywood rectangles for the seat. Determine the size of each piece with the spreaders installed in the kayak. Measure the distance between the seat rails to determine the width.

Cut out a small piece of canvas to use as a hinge, attach the two pieces of wood together. Paint and prime.

After the kayak and the seat have been painted attach velcro to the seat and the rails.

Step 8: Prime and Paint

Prime the kayak, seat and spreader boards.

Coat the seat, spreader boards and the kayak with at least 3 coats of paint.

Step 9: Enjoy!

First trip out was a success! The kayak is stable, and a lot faster than I expected. It was a very windy day, so the water was pretty rough.

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107 Comments

You totally rocked this project and this Instructable. I was looking for something else but my search criteria also matched your project! Lucky find for me! Thanks so much!

Just 2 and a half quick questions! Ha

Where can i find the canvus for this? I looked for some in las vegas with no luck. Any online shops?

And 2 would this kayak work for someone who is 6 foot 1 and about 200lbs? If not, the half question, is there any blueprints out there that would work?

Thank you! This boat is dope!

hey can you post a video of you folding it and unfolding it in addition to the photo o you riding it? it would be really helpful to see the difference between this and a normal kayak

1 reply

This guy made basically the exact kayak (folding kayak plan, but with 8 foot plywood), you can see his video here:

http://boysdad.com/archives/3710

Cool! I'm curious if anyone has tried this with Liquid Nails bonding it together?

Also, does standard exterior paint really waterproof this without leaking/seeping?

Would paint&primer paint also work?

I've seen two basic variations on this design, the one presented here that uses an 8' x 4' sheet of plywood and another that uses a 10' x 4' sheet of plywood. What I am attempting to figure out is, for someone like me (I'm just shy of 6' 2" tall) fit (without serious contortions) into the design based on the 8' x 4' sheet of plywood?

I would like to go with the 8' x 4' design, but I don't want to feel like a pretzel in the kayak. Can anyone offer any insights?

Thanks.

P.S. In the original 1963 Jess E. Rathburn article he shows doing a kayak in a crocodile motif (not my cup of tea... but to each their own). This gives rise to the question, what is the wildest / craziest paint / decorating job that has been done on one of these kayaks?

10 replies

I reworked this design a few years ago as the duckchaser. About 30 have been built from the plans & instructions I've posted in a Yahoo Group.
Max paddler weight for the standard duckie is about 220lb.
A minor revamp has been done (labelled Goosechaser) to lift the payload to 300 lb but it hasn't hit the water yet.
A 6'+ paddler fits OK unless they have VERY long legs.
They are NOT white water craft though I've bashed mine through a fair bit of grade I & II water. a few minor cracks in the ply fixed at the end of the day & lots of rock scratches but no damage at all to the canvas - that stuff is tough.
(I found references to the design going back to the 1930s - nothing is really new)
Don

Where can I find the plans for the Goosechaser/duckchaser?

groups.yahoo.com/group/duckchaser/

Most recent plans & instructions there plus in the Files section furtther minor improvements in construction. 9eg. laminated runners, better seat, splash deflecter

Thanks ... will join the Group and post any photos related to the project. Have a couple of ideas on attachments for it

Hi - so far over 70 built (officially) but I know of others who haven't provided me with my bottle of wine :-)
Plans & upgrades modifications etc available on (also lots of pics) groups.yahoo.com/group/duckchaser/
Included is the design changes for an owner weighing 165kg. (a Goosechaser)Also have made one half way between for a guy weighing 135kg.

maintann, I have been trying to find your plans on Yahoo Groups because I am of a height and weight that might sink this boat. Do you have a link? Thanks,

cool! have you found a good way to carry them? i'm thinking about sewing something from the leftover canvas and adding a shoulder strap.

Well mine has shark teeth, eyes, a couple thumbs-ups and a racing stripe, if you want some pictures i would gladly post them.

Shark teeth on a kayak sounds like it could be neat. Yes, I would love to see a good photo of what you have done.

Thats the paint job, if you want to see more pics more will be posted if you scroll up. Thanks =D

IMG_8961.jpgIMG_8958.jpg

(third attempt to post an answer here - not sure just how the new "improved" groups is supposed to work)
So far over 70 have been built to my plans so something must be right about them. (more than this have been built but I haven't received my bottle of wine so they're not official)
the plans are at groups.yahoo.com/group/duckchaser/
Also instructions on how to expand one to make a Goosechaser for a payload of 165kg.(thats 363 lb) Also made one half way between for a friend weighing 135 kg. Standard one handles just over 100kg easaily.

How is this boat holding up?