PLYWOOD CANOE BUILDING

PLYWOOD CANOE BUILDING

Post by winston william » Sun, 31 Dec 2000 05:19:06


As a first time builder and decided to build the SWEET DREAM following the
plans from the book.I have run into a major problem of the 4mm marine grade
plywood splitting when trying to fold it together at the stem ends. I now
have to patch the plywood and fold again hoping it won't split.
  My question is what to use to repair my problem and still be able to bend
the stems up. Would fiberglass work and what is the best way to tackle it.
The plywood seems to want to splinter at the slightest bending,

                                          Thank You for any Replies

                                                             Winston
Williams


 
 
 

PLYWOOD CANOE BUILDING

Post by Chris Cranda » Sun, 31 Dec 2000 07:10:39

: As a first time builder and decided to build the SWEET DREAM following the
: plans from the book.I have run into a major problem of the 4mm marine grade
: plywood splitting when trying to fold it together at the stem ends. I now
: have to patch the plywood and fold again hoping it won't split.
:   My question is what to use to repair my problem and still be able to bend
: the stems up. Would fiberglass work and what is the best way to tackle it.
: The plywood seems to want to splinter at the slightest bending,

I hope you are using only the finest occume plywood for this.  Marc
Pettingill states pretty clearly that cheaper plywood won't take the bend.

One way to help things along is to put hot (HOT) wet rags on the outer ply
of the bend.  This allows for better bending with less splitting.

 
 
 

PLYWOOD CANOE BUILDING

Post by brian whatco » Sun, 31 Dec 2000 07:10:58

No personal experience with this tip
AND
it's not really recommended to soak plywood
BUT
soaking wood overnight in a water solution with ammonia added
is said to  reduce wood to spaghetti until it dries.
More effective than steaming it's said.....

Brian

On Fri, 29 Dec 2000 15:19:06 -0500, "winston williams"

Quote:

>As a first time builder and decided to build the SWEET DREAM following the
>plans from the book.I have run into a major problem of the 4mm marine grade
>plywood splitting when trying to fold it together at the stem ends. I now
>have to patch the plywood and fold again hoping it won't split.
>  My question is what to use to repair my problem and still be able to bend
>the stems up. Would fiberglass work and what is the best way to tackle it.
>The plywood seems to want to splinter at the slightest bending,

>                                          Thank You for any Replies

>                                                             Winston
>Williams



Brian Whatcott   Altus OK

        Eureka!

 
 
 

PLYWOOD CANOE BUILDING

Post by admi » Sun, 31 Dec 2000 08:20:34

Your best bet would be to purchase okoume marine ply for the high bend
sections..
It would seem that your marine plywood may not be okoume. This is
unfortunate as
it can take some serious bending at 4mm thick.

Good Luck
Yan

Quote:
> As a first time builder and decided to build the SWEET DREAM following the
> plans from the book.I have run into a major problem of the 4mm marine
grade
> plywood splitting when trying to fold it together at the stem ends. I now
> have to patch the plywood and fold again hoping it won't split.
>   My question is what to use to repair my problem and still be able to
bend
> the stems up. Would fiberglass work and what is the best way to tackle it.
> The plywood seems to want to splinter at the slightest bending,

>                                           Thank You for any Replies

>                                                              Winston
> Williams



 
 
 

PLYWOOD CANOE BUILDING

Post by William R. Wa » Sun, 31 Dec 2000 08:48:53

the glue in the plywwod is good up to about 180 damp degrees - that's the
standards test for waterproof. I've warmed and wet cheap luan underlay ply
with steam from a kettle on a camp stove, the ply under poly tarp so the
hot moist air could circulate without escaping too fast. Used the
technique to bend a small 1 ft x 2 ft transom into a bit of a curve. Go
ahead and dampen the wood to soften it. Warm it if you can.

I don't know about the amonia suggestion. Might be okay for solid wood but I'd
look into what it might do to the glue holding the plywood together before
trying it.

By the way, I was overeager bending the plywood for the transom and the
middle ply cracked. The transom has a slightly noticable crease in it if I
point it out to people, but doesn't leak. Good luck.

Quote:

> As a first time builder and decided to build the SWEET DREAM following the
> plans from the book.I have run into a major problem of the 4mm marine grade
> plywood splitting when trying to fold it together at the stem ends. I now
> have to patch the plywood and fold again hoping it won't split.
>   My question is what to use to repair my problem and still be able to bend
> the stems up. Would fiberglass work and what is the best way to tackle it.
> The plywood seems to want to splinter at the slightest bending,

>                                           Thank You for any Replies

>                                                              Winston
> Williams



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PLYWOOD CANOE BUILDING

Post by jerry3.. » Mon, 01 Jan 2001 04:13:48

Dave Dean built this boat on TV's "The Boat shop" and had the same
experience with the wood splitting. He drilled holes slightly ahead of
the splits to "intercept" them and stop the splitting. He then put some
temporary bolts in these holes along with large "fender" washers on
each side of hull to everything in place until he was done bending the
plywood. He later went back and fixed the holes & splits with epoxy w/
filler. It looked like he was building w/Okumme ply. Also Dynamite
Payson uses steaming hot towels to pull panels in place on several of
his designs, specifically "Diablo". He's built more than all of us
combined so take it for what its worth. Good Luck!



Quote:
> As a first time builder and decided to build the SWEET DREAM
following the
> plans from the book.I have run into a major problem of the 4mm marine
grade
> plywood splitting when trying to fold it together at the stem ends. I
now
> have to patch the plywood and fold again hoping it won't split.
>   My question is what to use to repair my problem and still be able
to bend
> the stems up. Would fiberglass work and what is the best way to
tackle it.
> The plywood seems to want to splinter at the slightest bending,

>                                           Thank You for any Replies

>                                                              Winston
> Williams



Sent via Deja.com
http://www.deja.com/
 
 
 

PLYWOOD CANOE BUILDING

Post by Dave Bosto » Mon, 01 Jan 2001 09:02:32

You may want to look at the pirogue kit at http://www.unclejohns.com
(URL is out of hand recollection)  The 'kit' is quite small and consist
of shaped stems and some shaped pieces to make the 3 ribs, very simple,
no strongback used, very easy bends.

: As a first time builder and decided to build the SWEET DREAM following the
: plans from the book.I have run into a major problem of the 4mm marine grade
: plywood splitting when trying to fold it together at the stem ends. I now
: have to patch the plywood and fold again hoping it won't split.
:   My question is what to use to repair my problem and still be able to bend
: the stems up. Would fiberglass work and what is the best way to tackle it.
: The plywood seems to want to splinter at the slightest bending,

:                                           Thank You for any Replies

:                                                              Winston
: Williams


--

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PLYWOOD CANOE BUILDING

Post by gcouge » Tue, 02 Jan 2001 15:35:14

Soaking it in pure anhydrous ammonia is even better but hard to do since
it boils at 20 below 0 f.
--
Gordon    W5RED


: No personal experience with this tip
: AND
: it's not really recommended to soak plywood
: BUT
: soaking wood overnight in a water solution with ammonia added
: is said to  reduce wood to spaghetti until it dries.
: More effective than steaming it's said.....
:
: Brian
:
:
: On Fri, 29 Dec 2000 15:19:06 -0500, "winston williams"
:
: >As a first time builder and decided to build the SWEET DREAM following
the
: >plans from the book.I have run into a major problem of the 4mm marine
grade
: >plywood splitting when trying to fold it together at the stem ends. I
now
: >have to patch the plywood and fold again hoping it won't split.
: >  My question is what to use to repair my problem and still be able to
bend
: >the stems up. Would fiberglass work and what is the best way to tackle
it.
: >The plywood seems to want to splinter at the slightest bending,
: >
: >
: >                                          Thank You for any Replies
: >
: >                                                             Winston
: >Williams
: >
: >

: >
: >
:
: Brian Whatcott   Altus OK

:         Eureka!