"Professor Freshwaters" ) writes:
I have a set of plans for a Glen-L TNT and I've decided to build it.

The question is what kind of plywood or plywood substitute? The marine
grade ply of 20 or 30 years ago seems to be history.........

Marine ply is available but it is expensive, okume is light and popular
and costs about twice as much as douglas fir. Douglas fir would be good
for a "knock about" boat but I don't know the size of the one you mention.
Okume comes in 1/5" inch (metric standard). Douglas fir seems to start at 3/8"
at lumber yards and you'll have to sort through it for good sheets with no
surface splits or edge voids.

I've used cheap underlayment plywood on my small boats, just painted, no
fibreglass. One is just starting it's 6th season and the face ply is
lifting off in one place (delamination) over a void in the middle ply. I'm
going to have to patch it this season and maybe replace the bottom of the
boat next summer.

--
------------------------------------------------------------------------------
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