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Cold molded v/s stitch and glue

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Dec 10, 2002, 8:53:26 AM12/10/02
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Hi!

I want to compare "cold molded" v/s "stitch and glue" for sail boats between
21 to 27 feet.

What's your evaluation regarding:
1) Abilities required.
2) Cost
3) Time
4) Quality of final product.

A.

James Moran

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Dec 10, 2002, 9:02:50 PM12/10/02
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"nav" <no...@nomore.com> wrote in message
news:3df5f...@nova.entelchile.net...

> Hi!
>
> I want to compare "cold molded" v/s "stitch and glue" for sail boats
between
> 21 to 27 feet.
>
> What's your evaluation regarding:
> 1) Abilities required.
Cold molding requires more skill.

> 2) Cost
Cold molding costs more.

> 3) Time
Cold molding takes more time

> 4) Quality of final product.

Cold molding makes a better final product.

> A.


Klaus

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Dec 11, 2002, 2:35:13 AM12/11/02
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For a boat of that size stitch and glue is perhaps not the best idea,
this technique is usually used for dinghies. My 10' dinghy is made that
way, a very quick method to get a hull . But, my 26' plywood sharpie is
neither stitch & glue nor cold moulded. There are other alternatives to
build a plywood hull in a reasonable time.
Klaus

Jacques Mertens

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Dec 11, 2002, 9:23:01 AM12/11/02
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Agree except for #4.
--

Cold molding is only better if you compare to first generation, primitive
stitch and glue.
If you use our stitch and glue method, the final product is a true composite
sandwich, much stronger at equal weight than cold molded wood and much
easier to maintain.

We should insist on #3: cold molding is very labor intensive.


--
jules
http://www.bateau.com

"James Moran" <jfm...@optonline.net> wrote in message
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ChrisW

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Dec 11, 2002, 6:34:48 PM12/11/02
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Where did you get the idea that "Stitch and glue is usually used for
dinghies". This method has been used for bigger boats for a very long time
in places like Australia. It may not be well known here in the US, but is
becoming more and more popular and not just for dinghies. You need to check
out http://www.devlinboat.com/ and even http://www.glen-l.com/ is starting
to have larger "stitch and glue" designs. Twenty seven feet for a stitch and
glue is not big. I even know of a 52 foot stitch and glue that is a very
nice boat and has made quite a few trips to the Bahamas.

ChrisW

Klaus wrote:

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Nick White

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Dec 13, 2002, 1:37:40 AM12/13/02
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On Wed, 11 Dec 2002 09:23:01 -0500, "Jacques Mertens"
<j...@atlantic.net> wrote something
......and in reply I say!:

>Agree except for #4.
>--
>
>Cold molding is only better if you compare to first generation, primitive
>stitch and glue.
>If you use our stitch and glue method, the final product is a true composite
>sandwich, much stronger at equal weight than cold molded wood and much
>easier to maintain.

Surely if you cold moulded and sandwiched, then the round bilge cold
moulded would not have any seams/pressure points?

>
>We should insist on #3: cold molding is very labor intensive.

yep. Guys have been known to part time build one strip per night,
pretty well.

I do have to say that a varnished cold moulded boat is a beautiful
thing, though.

Nick White --- HEAD:Hertz Music

Please remove ns from my header address to reply via email


!!
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The ONLY way Man can be the most important thing on this planet is to ruin it.

Glenn Ashmore

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Dec 13, 2002, 5:26:48 AM12/13/02
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Cold molding produces a strong light weight hull but takes a lot of
labor and veneers are outrageously expensive when you can even find them.

You should look at strip/composite. A little more expensive than S&G
but it goes very fast, material is easy to find or make yourself,
strength to weight is almost as good as cold molding and you can develop
very nice curves.

nav wrote:


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com


Jacques Mertens

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Dec 13, 2002, 10:03:40 AM12/13/02
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Hey thanks for the new term: strip-composite. I like it much better than
sheeted or sheated strip.
With the designer specifying 45/45 biaxial, it becomes a tri-axial material.

--
jules
http://www.bateau.com

"Glenn Ashmore" <ru...@bellsouth.net> wrote in message
news:3DF9B5...@bellsouth.net...

Glenn Ashmore

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Dec 13, 2002, 10:40:19 AM12/13/02
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Strip/composite is closer to cored composite than it is to traditional
strip. With two layers of uni run 45/45 and one run 90 my hull is
incredibly strong. After the rollover, it hogged less than 1/4" bow to
stern with 16' hanging out either end of the cradle and no stringers,
bulkheads or interior glass installed.

Stephen Baker

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Dec 13, 2002, 4:01:23 PM12/13/02
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>With the designer specifying 45/45 biaxial, it becomes a tri-axial material.

Which is damn close to being quasi-isotropic, assuming the balance is right.
Dang, I love those long words.....

Steve

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