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

[Greg Newell]

Dale,
         How do you determine this? Is there some formula?

Greg Newell



At 09:51 AM 2/18/2005, you wrote:
>   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
>
>

Greg Newell
Greg's piano Forté
mailto:gnewell@ameritech.net