More CC vs RC questions was RE: Killer Octave & Pitch Raise

[Terry]

Maybe one thing being overlooked here is that, while panel stiffness is
increased by applying downbearing, the panel has a significant amount of
stiffness even with no compression at all. Even before it's ribbed, the
panel has stiffness. I don't know how the numbers would actually work out in
a working soundboard, but perhaps its not inconceivable that a CC board
could end up with similar stiffness as a RC&S board - by varying panel
thickness or whatever - maybe it's just that stiffness is achieved in part
by different means (and that may only be a small percentage of total
stiffness).

If what I am suggesting holds any water at all, it may be then that the two
systems might not necessarily produce greatly divergent tonal qualities.

Terry Farrell


> If I may try to answer my own question having read back through this
> thread.  The stiffness of the panel is produced by applying whatever
> downbearing is required to achieve it.  The difference being that the
> ribs take the stress of supporting the bearing over time rather than the
> panel and therefore the stiffness of the panel is likely to hold up for
> longer avoiding the inevitable compression set if the panel were
> supporting the bearing alone.

SNIP
>
> David Love
> davidlovepianos@comcast.net