wrote in news:1169496475.404255.84720
@m58g2000cwm.googlegroups.com:


Mustardbuilder wrote:
"Morgans" wrote in news:cZIrh.1221$cZ1.187
@newsfe04.lga:


"Mustardbuilder" wrote

Well, what I was actually asking is if I could laminate the two
pieces
to take the curve in the wing. I realise this is basic stuff for a
lot
of you guyus, but I've never bent realatively thick ply before and
I
don't want to make a mess out of the rest of the wing trying..

Reread what I said. That is how to laminate two, without a mold.
One
should work, though, no problem


Dunno, that's what I was asking. I've laminated two pieces of ply
together before, just was wondering if it was practical or advisable
to
do it curved.

Laminating a curved piece is, if anything, better than laminating
a flat piece, and also better than using a single piece.

Yeah, that's what I reckoned.

If you laminate it on the curve before the glue sets the
laminated plywood will be pre-stressed to the desired curve.

You don't need a mold, you can attach one piece, let it set,
then glue the second piece over it.

Regarding the veneers, the laminated piece should be symetrical.
If the pieces have an A and a B face, they should be laminated
ABBA or BAAB, not ABAB or BABA. The grain on the new front
and back face should be parallel. I'd put the A faces out, ABBA.

Well, the don't really. This stuff is so fine it's beyond belief. For
instance the 1/4 birch IU have is 12 ply and is one direction on one
side and the other on the other side, so it doesn't much matter which
way you put it on.

But I think aircraft and marine plywood is supposed to have A-grade
veneers front and back, right?


This stuff has a grade all the way through..