RC&S question JD

[David Love]

Exactly!  One of the main points of building RC&S boards is the greater
predictability in terms of crown and deflection and ultimately tonal
response in each section of the soundboard.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Sunday, January 27, 2008 1:26 PM
To: Pianotech List
Subject: Re: RC&S question JD


> *Further, if we can't predict this sag, we can't predict the dynamic 
> bearing and angle of string deflection, which means we don't know the 
> pressure and are going to have a rough time of making any rib scale that 
> isn't a shot in the breeze.*

Who says we can't predict rib deflection? One of the first 
things I did after Del ruined my life by getting me interested 
in this stuff was to build a spreadsheet for designing ribs 
from the string scale. Calculating deflection against bearing 
load is exactly how I design rib scales. Works out pretty 
close in the piano after it's built too.