Re: AC&Glass vs Okume
I haven't ever seen fir ply here in Italy. However, 1/4" (6 mm)
okoumé could be 3-ply also. It's actually 5.5 mm thick, with a
thick core and paper thin veneers outside. The 5-ply is much more
expensive.
That's the reason why I wouldn't use the 3-ply 6-mm okoume. This is
flimsy stuff, and I'd rather use the 5-ply 8 mm instead of it even if
the design specifies 6 mm. Best, Pippo
okoumé could be 3-ply also. It's actually 5.5 mm thick, with a
thick core and paper thin veneers outside. The 5-ply is much more
expensive.
That's the reason why I wouldn't use the 3-ply 6-mm okoume. This is
flimsy stuff, and I'd rather use the 5-ply 8 mm instead of it even if
the design specifies 6 mm. Best, Pippo
--- Inbolger@egroups.com, znw@i... wrote:
> Make sure to check the number of plies. 1/4" AC and marine fir
> is 3-ply, occume is 5-ply. 3/8" AC is usually 3-ply but fir marine
> and occume is 5-ply. 1/2" AC should be 5-ply (but make sure in
> advance).
Make sure to check the number of plies. 1/4" AC and marine fir
is 3-ply, occume is 5-ply. 3/8" AC is usually 3-ply but fir marine
and occume is 5-ply. 1/2" AC should be 5-ply (but make sure in
advance).
A void in 3-ply is nasty stuff, you've lost 1/3 of the wood. So it
will
need to be filled--more time and money.
Glassing takes a lot of time, so that's another factor. Much
faster/easier to coat quality ply with a coat or two of epoxy to seal
the grain. If you've got the time, by all means get AC and have
fun glassing and filling voids. You'll save money. But if you're on
a schedule and can afford it, consider using better ply to avoid
some/all the glassing.
I ended up making my Long Micro with 3/8" fir marine since the
3-ply 3/8" AC that is available around here (Long Island, NY)
scared me. I glassed the whole exterior with 6 oz cloth (below
the waterline) and 4 oz (above the waterline). The 4 oz is MUCH
easier to handle and I'd do the whole thing in 4 oz if I was
making the boat again.
Good luck!
Dan
Long Micro pages:http://www.znw.com/homepage/zephyr.htm
is 3-ply, occume is 5-ply. 3/8" AC is usually 3-ply but fir marine
and occume is 5-ply. 1/2" AC should be 5-ply (but make sure in
advance).
A void in 3-ply is nasty stuff, you've lost 1/3 of the wood. So it
will
need to be filled--more time and money.
Glassing takes a lot of time, so that's another factor. Much
faster/easier to coat quality ply with a coat or two of epoxy to seal
the grain. If you've got the time, by all means get AC and have
fun glassing and filling voids. You'll save money. But if you're on
a schedule and can afford it, consider using better ply to avoid
some/all the glassing.
I ended up making my Long Micro with 3/8" fir marine since the
3-ply 3/8" AC that is available around here (Long Island, NY)
scared me. I glassed the whole exterior with 6 oz cloth (below
the waterline) and 4 oz (above the waterline). The 4 oz is MUCH
easier to handle and I'd do the whole thing in 4 oz if I was
making the boat again.
Good luck!
Dan
Long Micro pages:http://www.znw.com/homepage/zephyr.htm
--- Inbolger@egroups.com, David Ryan <david@c...> wrote:
> FBBB --
>
> Out where I'm building there are two choices of plywood: AC fir
and
> Marine fir. Given that fir checks weather it's AC or Marine,
there's
> really no choice. You've gotta go with the AC since either one
has to
> be sheathed.
>
> But it was got me wondering.
>
> What is the cost difference between a sheet of AC fir, sheathed
and
> painted vs a sheet of okume, sealed and painted?
>
> My scooner is built of 1/4 inch and 1/2 inch AC fir and I spent
about
> $300 on glass and epoxy, and $250 on the ply. Would I really
have
> saved money using the more expensive plywood?
>
> YIBB,
>
> David
>
> CRUMBLING EMPIRE PRODUCTIONS
> 134 W.26th St. 12th Floor
> New York, NY 10001
> (212) 247-0296
Mr Payson asserts that "shop grade" was merely a lumber yard marking
for banged up sheets of whatever, rather than a plywood industry
grade.
for banged up sheets of whatever, rather than a plywood industry
grade.
>I was looking at PCB's chapter on Tortise in "Different Boats" last
>night and noted that he called for "shop grade" plywood and made a
>distinction between that and "exterior."
>
>What is "shop grade"?
>
>Peter
>
>
>
>--- Inbolger@egroups.com, David Ryan <david@c...> wrote:
>> FBBB --
>>
>> Out where I'm building there are two choices of plywood: AC fir and
>> Marine fir. Given that fir checks weather it's AC or Marine,
>there's
>> really no choice. You've gotta go with the AC since either one has
>to
>> be sheathed.
>>
>> But it was got me wondering.
>>
>> What is the cost difference between a sheet of AC fir, sheathed and
>> painted vs a sheet of okume, sealed and painted?
>>
>> My scooner is built of 1/4 inch and 1/2 inch AC fir and I spent
>about
>> $300 on glass and epoxy, and $250 on the ply. Would I really have
>> saved money using the more expensive plywood?
>>
>> YIBB,
>>
>> David
>>
>> CRUMBLING EMPIRE PRODUCTIONS
>> 134 W.26th St. 12th Floor
>> New York, NY 10001
>> (212) 247-0296
>
>
>
>
>Bolger rules!!!
>- no cursing
>- stay on topic
>- use punctuation
>- add your comments at the TOP and SIGN your posts
>- add some content: send "thanks!" and "ditto!" posts off-list.
I was looking at PCB's chapter on Tortise in "Different Boats" last
night and noted that he called for "shop grade" plywood and made a
distinction between that and "exterior."
What is "shop grade"?
Peter
night and noted that he called for "shop grade" plywood and made a
distinction between that and "exterior."
What is "shop grade"?
Peter
--- Inbolger@egroups.com, David Ryan <david@c...> wrote:
> FBBB --
>
> Out where I'm building there are two choices of plywood: AC fir and
> Marine fir. Given that fir checks weather it's AC or Marine,
there's
> really no choice. You've gotta go with the AC since either one has
to
> be sheathed.
>
> But it was got me wondering.
>
> What is the cost difference between a sheet of AC fir, sheathed and
> painted vs a sheet of okume, sealed and painted?
>
> My scooner is built of 1/4 inch and 1/2 inch AC fir and I spent
about
> $300 on glass and epoxy, and $250 on the ply. Would I really have
> saved money using the more expensive plywood?
>
> YIBB,
>
> David
>
> CRUMBLING EMPIRE PRODUCTIONS
> 134 W.26th St. 12th Floor
> New York, NY 10001
> (212) 247-0296
FBBB --
Out where I'm building there are two choices of plywood: AC fir and
Marine fir. Given that fir checks weather it's AC or Marine, there's
really no choice. You've gotta go with the AC since either one has to
be sheathed.
But it was got me wondering.
What is the cost difference between a sheet of AC fir, sheathed and
painted vs a sheet of okume, sealed and painted?
My scooner is built of 1/4 inch and 1/2 inch AC fir and I spent about
$300 on glass and epoxy, and $250 on the ply. Would I really have
saved money using the more expensive plywood?
YIBB,
David
CRUMBLING EMPIRE PRODUCTIONS
134 W.26th St. 12th Floor
New York, NY 10001
(212) 247-0296
Out where I'm building there are two choices of plywood: AC fir and
Marine fir. Given that fir checks weather it's AC or Marine, there's
really no choice. You've gotta go with the AC since either one has to
be sheathed.
But it was got me wondering.
What is the cost difference between a sheet of AC fir, sheathed and
painted vs a sheet of okume, sealed and painted?
My scooner is built of 1/4 inch and 1/2 inch AC fir and I spent about
$300 on glass and epoxy, and $250 on the ply. Would I really have
saved money using the more expensive plywood?
YIBB,
David
CRUMBLING EMPIRE PRODUCTIONS
134 W.26th St. 12th Floor
New York, NY 10001
(212) 247-0296