<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: More CC vs RC questions was RE: Killer Octave & Pitch</title></head><body> <div>At 2:58 PM +0100 16/2/05, Richard Brekne wrote:</div> <blockquote type="cite" cite><br></blockquote> <blockquote type="cite" cite>. . . Objectivity often suffers . . .</blockquote> <div><br></div> <div>[then follows with]</div> <div><br></div> <blockquote type="cite" cite>. . . to <<prove>> that one or another method is more or less successfull then another.  Should one actually wish to argue that point . . . then it is simply impossible to ignore that the overwhelmingly vast majority of concert pianists will choose instruments that employ CC boards.</blockquote> <div><br></div> <div>Oh of course - all of the above mentioned concert pianists have tried and discarded RC&S boarded instruments as inferior? Concert pianists choose CC boards because, at this point in the evolution of the piano, they don't have any option.</div> <div><br></div> <div>Why don't you similarly 'prove' that, because most folks travel via wheeled terrestrial vehicles, magnetic levitation must be an inferior concept to wheeled transport? Clearly the proof is there. Almost all humans use wheeled vehicles for their day to day transport.</div> <div><br></div> <div><br></div> <div>At 6:27 AM -0800 16/2/05, David Love wrote:</div> <blockquote type="cite" cite>  Why doesn't compressing the panel make</blockquote> <blockquote type="cite" cite>it stiffer?</blockquote> <div><br></div> <div>I'm not sure that it does or doesn't. It will probably depend on whether the spring rate of the panel assembly is linear or progressive. I don't think anyone has conclusively proven this by observation at this time. I have done some measuring on the test bench, but it remains inconclusive until I do further testing and measuring. I'm not suggesting that it either is or isn't linear. I just haven't measured enough panels to be sure that the observations I have made are reliable and not just an aberration.</div> <div><br></div> <div>In other posts there has been much speculation about which alternative construction method results in more or less stiffness and from which components<font color="#0000FF"> (ribs or panel or compression etc)</font>. However, the ultimate factors which are important to the tonal outcome will be the sound board area distribution, the stiffness<font color="#0000FF"> (or spring rate)</font> of the entire assembly and its stiffness/mass ratio<font color="#0000FF"> (which ideally will also vary for different sections of the scale)</font>, regardless of the design type. In both CC and RC&S the overall stiffness of an assembly will not be equal to the sum of its component-part stiffness. Therefore, to choose one example, the RC&S board will have an assembly stiffness which is considerably greater than just the sum of the free-rib stiffness, plus the free-panel stiffness, plus the free-bridge stiffness. The three parts will come together to provide a much stiffer overall assembly. The same obviously will occur with CC panel construction. I don't think it proves or disproves much to speak about the relative stiffness of one type against the other, since it is possible to vary the stiffness of a CC panel by varying both the rib and panel dimensions, and the RC&S board is almost infinitely variable with regard to its stiffness/mass relationship.</div> <div><br></div> <div>I realise that many believe that some panel compression is required for a satisfactory result - even Dale. But I suspect that we might still be a long way from the end of the RC&S 'development road. In time, even Dale might change his view. I might change mine. But at this time, clearly Dale is getting some wonderful results with his own sound boards. The re-boarded D he took to the recent convention has won many fans. As far as I know, our no. 5  is the only fuller RC&S boarded piano to have a CD made from it. Del and Ron or Terry, any recordings from your pianos out there? The recording of our first CD on no. 5 will be completed today. Greg Newell, I'll let the list know when the CD is being released for sale. I'll put some Mp3 from the sessions on the website sometime soon.</div> <div><br></div> <div>Since there are virtually no pianos out there with RC&S boards for anyone to hear at this time, perhaps before passing judgement, we should all try a couple of the new RC&S construction instruments before rejecting it as inferior technology. I have to tell you that for me, while I am gaining experience and drawing some conclusions, many questions remain.</div> <div><br></div> <div>Ron O.</div> <x-sigsep><pre>-- </pre></x-sigsep> <div><font face="Times New Roman" size="+1" color="#0000FF"><b>OVERS PIANOS - SYDNEY</b></font></div> <div><font color="#000000"><i>   </i></font><font color="#0000FF"><i>Grand Piano Manufacturers</i></font><font color="#000000"><br> _______________________</font></div> <div><font size="-2" color="#000000"><br> </font><font color="#000000">Web http://overspianos.com.au</font></div> <div><font color="#000000">mailto:ron@overspianos.com.au<br> _______________________</font></div> </body> </html>