mike hide wrote:


Basically only the strata that are in one direction are actually
contributing to the bending strength. So in terms of solid wood consider it
as a sheet of wood half the thicness of the plywood . In practice support
stringers of solid wood are always a good the deeper the better....mjh


Duane Bozarth wrote:
That's not actually quite right--the glued laminations add significantly
more resistance to bending owing to the glue than if they were not
present entirely (as your model suggests).


moreso than that. even if the cross plies were made of air they would
increase the stiffness of the panel- for the same reason a torsion box
or hollow core door is empty inside.