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.
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