<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html xmlns:v="urn:schemas-microsoft-com:vml" = xmlns:o="urn:schemas-microsoft-com:office:office" = xmlns:w="urn:schemas-microsoft-com:office:word" = xmlns:st1="urn:schemas-microsoft-com:office:smarttags" = xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=us-ascii"> <meta name=ProgId content=Word.Document> <meta name=Generator content="Microsoft Word 10"> <meta name=Originator content="Microsoft Word 10"> <link rel=File-List href="cid:filelist.xml@01C51581.3A3910B0"> <o:SmartTagType = namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style>  </head> <body lang=EN-US link=blue vlink=purple = style='tab-interval:.5in' id="role_body" bottomMargin=7 leftmargin=7 topmargin=7 rightMargin=7> <div class=Section1> 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.<o:p></o:p> <o:p> </o:p> <div> David Love <st1:PersonName>davidlovepianos@comcast.net</f= ont></st1:PersonName> = <o:p></o:p> </div> -----Original = Message----- From: = pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of <st1:PersonName>Erwinspiano@aol.com<= /font></st1:PersonName> Sent: Thursday, February = 17, 2005 7:10 PM To: pianotech@ptg.org Subject: Re: More CC vs = RC questions was RE: Killer Octave & Pitch Raise <o:p> </o:p> <div> In a message dated 2/16/2005 12:19:41 A.M. Pacific Standard Time, davidlovepianos@comcast.net writes:<o:p></o:p> </div> <blockquote style='border:none;border-left:solid blue = 1.5pt;padding:0in 0in 0in 4.0pt; margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'> effect of softer hammer, softer panel, might produce a tone that while having adequate power (loudness) might not have the balance of = partials to make the tone interesting, lively, expressive, you choose your favorite word.  So control of the panel's EMC, while seemingly = not as critical for purposes of achieving stiffness in the assembly = overall, might still be very critical in order to achieve a certain tonal balance.<o:p></o:p> </blockquote> <div>    David<o:p></o:p></spa= n> </div> <div>   I think this is possible & is my thinking. When panel compression  exsists some dynamic tension between the rib being = bent up a bit by the panel compression & the rib wanting to pull it back down creates continual static & dynamic reactive = force. Perhaps some of this is healthy & building boards  attempring to = shape & mold certain characterisitcs is very = interesting.<o:p></o:p> </div> <div>  I've been logging all the data per given board to keep track of the design parameters & then draw a conclusion based on the sound I get. = Ie original rib width,height,length. New rib crown width ,new length, Panel thickness , tapering ,where & how much. = Rib tapering etc.<o:p></o:p> </div> <div>  I installed the Mason board with cut-off, fish and altered rib heights = & widths, weds. & when the clamp came off in the morning = & it already had a very healthy & vibrant boom/rap even though the tight = bond surely isn't thoroughly cured. This is not usually the case. = <o:p></o:p> </div> <div>   Dale<o:p></o:p> </div> <div>  <o:p></o:p= > </div> </div> </body> </html>