---------------------- multipart/alternative attachment 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 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/2f/08/c8/d7/attachment.htm ---------------------- multipart/alternative attachment--
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