<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.5730.11" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY style="WORD-WRAP: break-word; khtml-nbsp-mode: space; khtml-line-break: after-white-space" bgColor=#ffffff> <DIV><FONT face="Bookman Old Style">Steve,</FONT></DIV> <DIV><FONT face="Bookman Old Style"></FONT> </DIV> <DIV><FONT face="Bookman Old Style">Paraphrasing from the weeks discussion:</FONT></DIV> <DIV><FONT face="Bookman Old Style"></FONT> </DIV> <DIV><FONT face="Bookman Old Style">Steinway NY builds CC boards, and most everyone else on the planet builds RC boards. A few of us small shop rebuilders are designing, building, and installing RC&S boards. Currently, I don't think there is a RC&S board piano being produced commercially. I expect that to change, hopefully soon.<BR></FONT></DIV> <DIV><FONT face="Bookman Old Style">RC & S does not require the soundboard panel (and ribs) being dried prior to glue-up to the extent that the classical RC method calls for.  RC&S needs no help from panel compression to support string bearing.<BR></FONT></DIV> <DIV><FONT face="Bookman Old Style">The purpose of designing crown into an RC&S board is to provide an opposing spring for the string downbearing, just like with RC and CC boards (and to prevent cracking in the dry seasons). The difference is that the crown support comes pretty much entirely from the ribs in the RC&S boards, and either partially or entirely from the panel in RC and CC boards (respectively).<BR></FONT></DIV> <DIV><FONT face="Bookman Old Style">Hope it helps.</FONT></DIV> <DIV><FONT face="Bookman Old Style">William R. Monroe</FONT></DIV> <DIV><FONT face="Bookman Old Style"> </DIV></FONT> <DIV><FONT face="Bookman Old Style"></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV> <DIV>What is the difference between RC (Rib crowned), and RC&S? I thought someone said here a few days ago that they were ecentialy the same. True? Another post mentioned something about mesuring the crown with a string or something like that. Is there a simple explanation of that process?</DIV> <DIV> </DIV> <DIV>Steve</DIV> <DIV>Pura Vida</DIV> <DIV> </DIV></DIV></BLOCKQUOTE></BODY></HTML>