Gene Nelson wrote: > Curious again - I have wondered about this. Is it not true that a CC > board is likely at its maximum stiffness because of compression prior to > applying the string load? String load pushes the board back toward it's > at rest/nuteral (for lack of better term) position which should mean the > board becomes less stiff under load?? > Gene Exactly backward. CC boards get their stiffness as the already compressed panel is compressed to the point that it won't compress any more, under bearing load. This is why CC boards need at least a minimum bearing load to function, and an RC&S board can work with a much broader range of bearing load, getting their stiffness from the beam support of the ribs. Ron N
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