"patrick mitchel" wrote in message ...
A friend was given a reference to the use of plywood as a spar in the ca-65
skyfly. Was unaware of the use of ply as a spar in aircraft. Perhaps a
laminated spar with all the veneers running the same direction, but with
half running parallel to the chord????? Anyone have knowledge of said
homebuilt? Thanks Pat

Probably they're referring to use of plywood in the spar structure.
Many wooden airplanes use built-up spars in which lumber is used to
carry the tension and compression loads, and plywood is used to keep
the lumber in its proper place. My Jodel has a box-type spar making
extensive use of plywood, with the face veneers running in various
directions to take maximum advantage of the ply's strength. That spar
carries all the wings loads: lift, drag and torsion. It's the only
spar in the wing, and is the single most complicated part in the
airplane. And the strongest.

Dan