Soundboard stiffening

[gordon stelter]

If the ribs are firmly suported on the ends they will
not be trying to straighten the board out, as they
will be kept in an upward arch independent of board
crowning or gluing.
     Thump

--- Richard Brekne <Richard.Brekne@grieg.uib.no>
wrote:
> Delwin D Fandrich wrote:
> 
> >
> >/On reflection I suspect this was because the
> initial load support came
> >entirely from compression within the soundboard
> panel while the ribs (though
> >lightly crowned they were also moderately bent as
> in a compression-crowned
> >soundboard system) were actually working to
> straighten the panel. /
> >
> This part I've heard before... and still scratch my
> head about... tho 
> the useage of the word "support" may be the clue to
> my ponderments.
> 
> >/Once the
> >ribs reached their neutral configuration they began
> helping the compressed
> >panel in supporting the load rather than fighting
> it, hence increasing the
> >spring rate of the system./
> >  
> >
> But this is not something I've heard before. In
> essence a declaration 
> that ribs do indeed (at some point) help in
> supporting the load.... in a 
> CC board. Tho why  should his support suddenly exist
> as soon as the ribs 
> are flat instead of being there all the time
> (perhaps countered by the 
> tendancies of the ribs to straighten to a lessening
> degree as said ribs 
> approach becomming straight).  
> 
> >>I thought your
> >>position was that
> >>there is essentially no difference in behavior or
> performance
> >>between an RC
> >>and a CC board.
> >>
> >>Phil Ford
> >>    
> >>
> >
> >Not quite. It is my position that soundboard
> systems of both types can be
> >made to sound essentially the same. At least
> initially. Their behavior and
> >performance may well be different, especially as
> time goes by.
> >
> >Del
> >
> >
> >  
> >
> _______________________________________________
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