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

[Erwinspiano@aol.com]

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Dave
  Another variable to keep in mind is that many of us are  using sitka spruce 
panels & the older designs used predominantly a softer  eastern wood. Softer 
wood under compression requires more thickness for strenght  to survive. WHere 
as Sitka is stiffer denser having the greatest strength to  wieght ratio. SO 
it can be thinner in the designs of any kind. It depends on  your idea of mass 
in the panel too.
    I keep that in mind when I'm choosing panel  thickness. This is also a 
variable that could effect part of the equation for  hammer selection.
 I.E> many old Stwy A 2s had panels routinely .360 in  the main part of the 
panel. With Sitka .320 to 340 is plenty even if you were  stricitly compression 
crowning.
  Dale

Well I meant that  more as a question than a statement.  One thing that does 
interest me is how  CC vs RC&S methods influence, either in design  or 
execution, the relationship between mass and spring rate and how that might  relate 
to proper hammer matching.   Which system,  for example, tends to have a  
thicker panel?  It seems that the  CC panel is generally thicker in the center and 
tapered toward the rim whereas  the RC&S panel is slightly thinner and more 
uniform in thickness (except  maybe around the bass perimeter).  Is that 
correct?  Might not the difference in mass  distribution of the CC panel explain 
differences in hammer matching and  potentially some tonal differences?  It seems 
that the CC panel requires a  much denser and possibly less flexible hammer 
than the RC&S board (at  least in my experience).  Whether  the tone production 
potential between the two with appropriate hammers is  net/net, is something I 
can't really answer but do wonder about.  The subject might point to some  
differences. 
 
David  Love
davidlovepianos@comcast.net  





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