Accreditations such as ISO 9001, FSC and PEFC ensure both product quality and choice are achieved. Yorkshire Plywood supply only graded quality plywood, sourced from around the world that meets our exacting quality control standards.
Because each veneer is glued together with adjacent plies having their grains at right angles to each other, plywood is very strong in both directions.
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Lets say you have a fuselage constructed with plywood formers, longerons, and a plywood skin.
Then there is the extreme case of no longerons and the thickest ply which (assuming the longerons and ply have the same density) would be the same as no ply and a solid covering of longerons. Since the ply has a tendency to warp- its best to limit its use to areas supported by spruce longerons and cross members.
ANC-18 says that, in general, a single spar web is stronger that a double spar web of the same weight. Assuming even distribution of longerons, of same density wood, loaded in pure bending, strength would be the same. Originally Posted by Aerowerx So, it would be better to split the "thicker" ply into two thinner plys (hypothetically speaking---not actually) and put something in between that all it does is keep the two separated (but bonded together)? From one skin to the next, on the skin you want very high tensile strength and especially stiffness, no matter the density. In the real world though, simply making structures smaller (larger aspect ratio, smaller diameter of the tail boom) makes it possible to shy away from sandwiches and go full monocoque.
The Czech build sailplane Alpin I own the plans, has just four longerons (20x20mm section) on top, left&right and bottom and 6mm thick plywood ribs spaced 600mm appart, for the tailcone aft of the cockpit.

On only a slight tangent, take a look at the stitch-and-glue method of boat construction used for plywood boats. In short, precalculated plywood panels are cut out flat, wrapped around a couple of permanent frames or temporary molds and then stitched together with plastic ties or copper wire.
I am very surprised never to have seen such a method applied to a homebuilt aircraft, at least for the fuselage. We keep an extensive range of both sheet materials and manufactured laminated panels, bonded panels and wrapped mouldings which are supplied throughout the UK and Ireland from our 3 sites in East Yorkshire. It is aluminum, and I've read that the Zero and the Focke-Wulf 190 were both influenced by the Hughes H-1. This might not translate directly to fuselage design, even though it is basically a beam, just like a spar. In the spar, you're splitting up the web, but keeping the caps the same, in the fuse, you're also splitting up the caps (longerons, more accurately) so that the web area is kept proportionally the same or smaller. Buckling is governing the limits on small planes, such that stiffness, not strength is the driving factor.
You might be able to make the structure a little lighter, but it would be much more difficult to build.

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