×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# how to define an adequate configuration for moullding kayak

## how to define an adequate configuration for moullding kayak

(OP)
i need to define a configuration to my kayak made by prepreg

### RE: how to define an adequate configuration for moullding kayak

So, what?
Do you think that a question is somehow implicit in your assertion?
Or are you merely filing a progress report?

Mike Halloran
Pembroke Pines, FL, USA

### RE: how to define an adequate configuration for moullding kayak

Open on top, closed on bottom, longer than it is wide.

### RE: how to define an adequate configuration for moullding kayak

Composition: H.D. polyethylene
Process method: rotational molding
Manufacturer: Hardigg Industries, S. Deerfield, MA.

### RE: how to define an adequate configuration for moullding kayak

The OP says he wants to use pre preg.
This would either require male or female molds.
B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

(OP)
bon, mon kayak est prévu d'avoir 8 plis pré-imprégné glass WR 300 et la moule est produite en composite (alternance entre Mat 300 et WR 300). alors, si vous avez une autre configuration plus convenable.
MERCI

### RE: how to define an adequate configuration for moullding kayak

Moulita.
Votre configuration est bon.
B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

Eight plies should give you a _very_ sturdy kayak, unless the glass cloth is extraordinarily thin/light.

How far do you intend to carry it?

Mike Halloran
Pembroke Pines, FL, USA

### RE: how to define an adequate configuration for moullding kayak

Mike that's 8 plies of 300 gram plain weave per sq metre = 2400 grams per meter. That stuff will be about 0.010" thick per layer giving a layup about 0.08" whilst over doing it by about 2 layers I do not think his Kayak will be too heavy.

Mike c’est 8 plis d’armure de 300 grammes par metre carre’ = 2400 grammes par metre. Que les choses seront environ 0,01 (.24mm) épaisseur par couche donnant un layup environ 0,08 (2mm) tandis que sur le faire par environ 2 couches, je ne pense pas que son kayak sera trop lourd.

B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

Weren't the first Corvettes made out of fiberglass and we all know how that ended. I would say that fiberglass for Kayaks would be risky on rocky shore lines

### RE: how to define an adequate configuration for moullding kayak

Chicopee,
A lot of the very early plastic Kayaks were made from woven Glass fiber, chopped strand mat and polyester resin. They were heavy, but they were a big performance boost over the wood , and canvas Kayaks they were replacing. The polyester resin was replaced with epoxy resin and more layers of thinner glass fiber woven cloth enabling the weight to be further reduced. The latest iterations of hand laid Kayaks and Canoes use Kevlar and carbon fiber lay ups for maximum strength and rigidity with minimum weight. These kayaks can get down to Design weights of 38 to 45 pounds ( 20.3 kg) However their dis- advantage is the price Very often pushing $1800 to$2000 .
This industry was turned on its head by the Roto Molded Kayak. Made from HDPE or Polypropylene. A closed pre heated mold with a premeasured quantity of plastic pellets was slowly turned while the plastic was evenly distributed over the mold surface. This was/is allowed to cool and a lightweight plastic kayak emerges just about ready to use. Far less cost and less need for skilled labor. these Kayaks are very often available for less than \$400, and are not much heavier than the carbon fiber , Kevlar kayaks.
B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

I thought Corvettes did quite well on rocky shore lines. What are you talking about?

### RE: how to define an adequate configuration for moullding kayak

I think Chicopee was talking about an automobile. The first fiberglass warship was a minesweeper not a Corvette.
B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

Why is Chicopee driving Corvettes on rocky shore lines anyway? If he want to see wrecked Corvettes, why doesn't he just visit that sinkhole at the Corvette museum?

### RE: how to define an adequate configuration for moullding kayak

The biggest problem with this whole conversation is that it is really in the wrong forum , It should have been posted in the Composite engineering forum. And since the original poster is a native French speaker , it could also have been posted in Translation assistance for Engineers.
B.E.

You are judged not by what you know, but by what you can do.

### RE: how to define an adequate configuration for moullding kayak

This conversation is really getting out of hand. Yep, I am talking about the automobile Corvette.

### RE: how to define an adequate configuration for moullding kayak

Corvette sports cars were made of chopped fiberglass and polyester resin

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!