I was always planning to tape the inside seams with 4oz eglass, was
just thinking about not glassing the whole inside with a single sheet.
High center is not something I had thought about... Beach takeoffs and
landings could create that situation. The wood I am using is 1/8th
Okume and I wonder if an extra 4" strip down the keel line would
suffice on the inside assuming Im a carefull paddler (could still get
into rough conditions though)

Found some good info on stress tests done for cedar strips but none of
them were only glassed on one side.

Manufacture is liable if I sink and die based on their reconmendations
so they can only say to follow the directions.

Thanks for all your posts so far

wrote:
The wood I am using is 1/8th Okume

If you're using plywood that thin, do yourself a favor and glass it on
both sides. Unless you screw up by making huge fillets and endpours,
your boat is going to be featherweight anyway (probably under 30#), so
what difference is an extra couple of pounds for full inner glass going
to make? Unless this is strictly an experiment to push the limits of
light weight, what's the point? Do you want a boat that you can actually
paddle regularly without worrying about damaging it?

There's a concept in cycling commonly called "stupidlight", the
lightening of components to the point that you sacrifice functionality
and durability. It applies to kayaks too. Light weight is not the be-all
and end-all and there are limits to how light a plywood boat can be. If
you really want something ridiculously light, build one of Platt
Monforts "Geodesic Airolite" boats. http://gaboats.com/

I'm with Brian on this. Re. endpours, many of clc kayak builders left out
endpours and replaced them with full-length sheer clamps. First longer than
required clamps are glued, then cut to a bevel at bow and stern using a
string streched from bow to stern as a reference with side panels spread to
required width with a stick. If you don't plan to hit things directly with
bow or stern I think sheer clamps will provide sufficient strength and
you'll save a lot of weight. My rowing shell doesn't have endpours.