We are talking about two different things.
The plywood we are testing is not a buck a truckload, it is not plain cheap
wood.

Anyway, I got at least one interesting response about a similar experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.
What keeps me going is the memory of all the people who were laughing at my
first boat designed for Airex. Foam for a boat hull? It will never work they
said . . .

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

"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
...
The poplar plywood I am testing is listed here as "marine" plywood:
http://www.worldpanel.com/eurolite.htm

I don't expect much distortion from a 5 ply 6mm ply with melamine glue,
saturated with epoxy and fiberglassed.
I am playing the devil's advocate here. I keep an open
mind about it and I am not ready to endorse it for such applications. I
may
if my tests come out positive, I may not if I read about some bad
experiences.

Thanks for your opinions and I would like to read more.

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


Well, I still think it is a bad idea, if for no other reason than that
the stuff is a buck a truckload up here in the NE and I have *never*
heard of *anyone* using is locally for anything to do with boats...
Scotty from SmallBoats.com

Anyway, I got at least one interesting response about a similar experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.

Do you have received my mail? I have sent it in the middle of virus storm (i
have received UNDREDS of virus mails!) and you can have lost it...
Paolo

No, I didn't. Please try again: we receive close to 1,000 spam emails a day.

"Paolo Zini" wrote in message
...

Anyway, I got at least one interesting response about a similar
experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.

Do you have received my mail? I have sent it in the middle of virus storm
(i
have received UNDREDS of virus mails!) and you can have lost it...
Paolo

"Jacques Mertens" ha scritto nel messaggio
.. .
No, I didn't. Please try again: we receive close to 1,000 spam emails a
day.

Posted in the private message area of amateurboatbuiding forum...
Only to avoid the spam traffic...

Paolo

otta filtre your email.
I get 4-5 unwanted mail messages per week.
My mail filtering strategy is in file www.ncf.ca/~ag384/e.mSpamFiltre.txt.
Some people find limiting the size of mail accepted to 600 lines gets rid of
most spam. I rejects all of the current worm spam.

"Jacques Mertens" ) writes:
No, I didn't. Please try again: we receive close to 1,000 spam emails a day.

"Paolo Zini" wrote in message
...

Anyway, I got at least one interesting response about a similar
experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.

Do you have received my mail? I have sent it in the middle of virus storm
(i
have received UNDREDS of virus mails!) and you can have lost it...
Paolo






--
------------------------------------------------------------------------------
William R Watt National Capital FreeNet Ottawa's free community network
homepage: www.ncf.ca/~ag384/top.htm
warning: non-freenet email must have "notspam" in subject or it's returned

Posted in the private message area of amateurboatbuiding forum...
Only to avoid the spam traffic...

The mail in amateurboatbuiding forum, remains parked in "out" box, refuses
to pass in "sent" box...
if I mail to the mail bounces back...

Paolo

"Jacques Mertens" wrote in message . ..
We are talking about two different things.
The plywood we are testing is not a buck a truckload, it is not plain cheap
wood.

Poplar is poplar is poplar. Maybe they put some expensive glue or
coating on it to dress it up but poplar still has bad qualities, it
soaks up water like a sponge and gets soft, it expands tremendiously
and distorts, it discolors (turns black with moisture), and it rots
easily, does not hold fasteners well, etc. However, it seems that you
have long before asking us, made up your mind and used it... So I will
leave it alone from here on...
Scotty


Anyway, I got at least one interesting response about a similar experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.
What keeps me going is the memory of all the people who were laughing at my
first boat designed for Airex. Foam for a boat hull? It will never work they
said . . .

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

"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
...
The poplar plywood I am testing is listed here as "marine" plywood:
http://www.worldpanel.com/eurolite.htm

I don't expect much distortion from a 5 ply 6mm ply with melamine glue,
saturated with epoxy and fiberglassed.
I am playing the devil's advocate here. I keep an open
mind about it and I am not ready to endorse it for such applications. I
may
if my tests come out positive, I may not if I read about some bad
experiences.

Thanks for your opinions and I would like to read more.

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


Well, I still think it is a bad idea, if for no other reason than that
the stuff is a buck a truckload up here in the NE and I have *never*
heard of *anyone* using is locally for anything to do with boats...
Scotty from SmallBoats.com

And THAT is probably why I won't be able to find a lightweight plywood for
the superstructure of my boat...the trade-offs aren't worth it. Denser is
tougher, less dense is ...less dense, and all you get when you buy low
density wood. Anyone know of a marine grade foam core hardwood-veneered
product? Seems like I saw something like that somewhere. Note: Most of
this is academic and just fun to look into. I'm sure I'll end up using
standard marine ply of some kind in the end.

Brian

--
My boat project: http://www.advantagecomposites.com/tongass


"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
. ..
We are talking about two different things.
The plywood we are testing is not a buck a truckload, it is not plain
cheap
wood.

Poplar is poplar is poplar. Maybe they put some expensive glue or
coating on it to dress it up but poplar still has bad qualities, it
soaks up water like a sponge and gets soft, it expands tremendiously
and distorts, it discolors (turns black with moisture), and it rots
easily, does not hold fasteners well, etc. However, it seems that you
have long before asking us, made up your mind and used it... So I will
leave it alone from here on...
Scotty


Anyway, I got at least one interesting response about a similar
experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.
What keeps me going is the memory of all the people who were laughing at
my
first boat designed for Airex. Foam for a boat hull? It will never work
they
said . . .

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

"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
...
The poplar plywood I am testing is listed here as "marine" plywood:
http://www.worldpanel.com/eurolite.htm

I don't expect much distortion from a 5 ply 6mm ply with melamine
glue,
saturated with epoxy and fiberglassed.
I am playing the devil's advocate here. I keep an open
mind about it and I am not ready to endorse it for such
applications. I
may
if my tests come out positive, I may not if I read about some bad
experiences.

Thanks for your opinions and I would like to read more.

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


Well, I still think it is a bad idea, if for no other reason than that
the stuff is a buck a truckload up here in the NE and I have *never*
heard of *anyone* using is locally for anything to do with boats...
Scotty from SmallBoats.com

"Brian D" wrote in message news:QWscb.568478$YN5.404597@sccrnsc01...
And THAT is probably why I won't be able to find a lightweight plywood for
the superstructure of my boat...the trade-offs aren't worth it. Denser is
tougher, less dense is ...less dense, and all you get when you buy low
density wood. Anyone know of a marine grade foam core hardwood-veneered
product? Seems like I saw something like that somewhere. Note: Most of
this is academic and just fun to look into. I'm sure I'll end up using
standard marine ply of some kind in the end.

Brian

Why not make the panels of foam and skins, like vacume bagging?
Scotty


--
My boat project: http://www.advantagecomposites.com/tongass


"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
. ..
We are talking about two different things.
The plywood we are testing is not a buck a truckload, it is not plain
cheap
wood.

Poplar is poplar is poplar. Maybe they put some expensive glue or
coating on it to dress it up but poplar still has bad qualities, it
soaks up water like a sponge and gets soft, it expands tremendiously
and distorts, it discolors (turns black with moisture), and it rots
easily, does not hold fasteners well, etc. However, it seems that you
have long before asking us, made up your mind and used it... So I will
leave it alone from here on...
Scotty


Anyway, I got at least one interesting response about a similar
experiment
(thanks Paolo) and since I am very stuborn, I will keep testing.
What keeps me going is the memory of all the people who were laughing at
my
first boat designed for Airex. Foam for a boat hull? It will never work
they
said . . .

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

"Backyard Renegade" wrote in message
om...
"Jacques Mertens" wrote in message
...
The poplar plywood I am testing is listed here as "marine" plywood:
http://www.worldpanel.com/eurolite.htm

I don't expect much distortion from a 5 ply 6mm ply with melamine
glue,
saturated with epoxy and fiberglassed.
I am playing the devil's advocate here. I keep an open
mind about it and I am not ready to endorse it for such
applications. I
may
if my tests come out positive, I may not if I read about some bad
experiences.

Thanks for your opinions and I would like to read more.

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


Well, I still think it is a bad idea, if for no other reason than that
the stuff is a buck a truckload up here in the NE and I have *never*
heard of *anyone* using is locally for anything to do with boats...
Scotty from SmallBoats.com

Because of resistance to puncture, isotropic properties and stiffness.
Foam sandwich doesn't work for small boats. To get sufficient resistance to
puncture, the skins must have a minimum thickness. For mechanical reasons,
we should use tri or quadriaxial while with plywood only biaxial is needed.
A sandwich panel made that way would be heavier than a plywood-epoxy-glass
sandwich.
Once you get around 27', foam sandwich becomes a valid choice. With
vacuum-bagging and aramids, we could build smaller units, donw to 20' but
the cost would be very high.

PS: about poplar, there are no fasteners in our boats . . .
--
Jacques
http://www.bateau.com

"Backyard Renegade" wrote in message

Why not make the panels of foam and skins, like vacume bagging?
Scotty