Carbon Fiber Playboat (kayak)


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suckiden
suckiden
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Hi everybody,

I am new to this forum and actually wanted to post this topic in the projects section but I am not allowed to create a new topic there. So hopefully it is ok to post it in this section.

Coming to my project, I plan to build myself a play boat similar to this out of carbon fiber.

http://www.talkcomposites.com/Uploads/Images/afd398e5-9a1e-4600-9e38-7931.jpg

For this project I want to make a two part mould one for the upper and one for the lower part of the boat (not sure how to make the coaming yet). For the lamination I want to try the resin infusion method to get a perfect surface finish and strength of the parts. The traditional way of making a carbon fiber or glass fiber kayak is to laminate the upper and lower part of the boat and then gluing (laminating) both halves together. But this brings some problems with it

1. aligning both halves is not easy (more work)
2. the transition will always be visible
3. not sure about the strength of the parts at the transition


Nevertheless I found a manufacturer on the net that is able to produce a kayak in one piece. This gives several advantages.

1. Less work afterwards because you don’t have to laminate anything together, and you get a perfect transition.
2. Improved stability of the boat - I guess.

Of course they don’t show how to do that because this is their secret and personal knowledge Wink
Luckily I could capture some pics out of a video that shows the process of separating the mould from the boat.

http://www.talkcomposites.com/Uploads/Images/83bad920-9ab4-4d10-8aef-48a9.png

http://www.talkcomposites.com/Uploads/Images/77baa9ed-5f30-494b-b5e3-2b90.PNG
After I have seen that a few questions came to my mind.

1. How is this process done? How do they stack the carbon layers inside the mould
2. it looks like they somehow managed to paint the boat already inside the mould. My thought on this is that they use some kind of graphic layer that the laminate together with the carbon fiber. Because they also have   more complex designs (see below), that’s why I think it wasn’t done with a regular paintjob. And furthermore, how would you paint it inside the mould? Doze

 http://www.talkcomposites.com/Uploads/Images/5f740816-eaf5-4b47-b495-970d.png

Thank you in advance and I am looking forward to get some answers to my questions.
panda
panda
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Composite kayaks are made, on the whole, in 2 parts.  They will be made in a 2 piece mold, the mold is bolted together, and then reinforcement is added around the inside seam that forms.

To add additional strength, an external seam can be added around the outside.

If you wanted to make the seam invisible, then they normally spend time polishing the seam out so that it is very difficult to see a join. But this takes a lot of time and effort.

To make it in a single piece is possible, but would take a lot of time and trial and error to do.  You would need to lay the boat up with the mold halves together and get the fabric into all the corners with no bridging, this is not easy.

In terms of the "painting" you mentioned, there are 2 ways which kayaks are being done at the moment.  The most common method being that it is a pigmented gelcoat they is put int eh mold first to give the design.  A lot of newer boats have gone down the route of being sprayed post production with a 2 part polyurethane, something I would not recommend as it requires a lot of safety equipment.

Aligning the halves together after making is a simple job, if he mold is made well, it will take no more than 10 minutes.  The strength if the finished part is just as good for a kayak as a single piece would be.

I have made a fair few kayaks in the last few years and are all still standing in one piece!

Anything else let me know,
GO

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