The Soundboard bit.. RC&S

[Erwinspiano at aol.com]

William
  Good clear post.  We should save this as a  definition has been asked for 
about  3 times this week & it  is a good descrpition of the various design 
processes we frequently speak  of.
  Sincerely
  Dale

Paraphrasing from the weeks  discussion:
 
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.

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.

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).

Hope it helps.
William R.  Monroe



 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20061211/2d4f0fa0/attachment.html