More CC vs RC questions was RE: Killer Octave & Pitch Raise

[David Love]

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It's an extension of the rim inwards toward the bridge from behind at
the upper end of the piano.  It's designed to reduce the amount of
excess soundboard area at the very top of the scale.  It's called a fish
because the shape of the extension is somewhat fish shaped.  Maybe Terry
or Ron have a picture they could post.  
 
David Love
davidlovepianos@comcast.net 
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of David Ilvedson
Sent: Thursday, February 17, 2005 7:50 PM
To: pianotech@ptg.org
Subject: Re: More CC vs RC questions was RE: Killer Octave & Pitch Raise
 

Sorry for my ignorance but what is the "fish"?

David Ilvedson



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Original message
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Received: Thu, 17 Feb 2005 22:09:52 EST
Subject: Re: More CC vs RC questions was RE: Killer Octave & Pitch Raise



In a message dated 2/16/2005 12:19:41 A.M. Pacific Standard Time,
davidlovepianos@comcast.net writes:
effect of softer hammer, softer panel, might produce a tone that while
having adequate power (loudness) might not have the balance of partials
to make the tone interesting, lively, expressive, you choose your
favorite word.  So control of the panel's EMC, while seemingly not as
critical for purposes of achieving stiffness in the assembly overall,
might still be very critical in order to achieve a certain tonal
balance.
   David
  I think this is possible & is my thinking. When panel compression
exsists some dynamic tension between the rib being bent up a bit by the
panel compression & the rib wanting to pull it back down creates
continual static & dynamic reactive force. Perhaps some of this is
healthy & building boards  attempring to shape & mold certain
characterisitcs is very interesting.
 I've been logging all the data per given board to keep track of the
design parameters & then draw a conclusion based on the sound I get. Ie
original rib width,height,length. New rib crown width ,new length, Panel
thickness , tapering ,where & how much. Rib tapering etc.
 I installed the Mason board with cut-off, fish and altered rib heights
& widths, weds. & when the clamp came off in the morning & it already
had a very healthy & vibrant boom/rap even though the tight bond surely
isn't thoroughly cured. This is not usually the case. 
  Dale
 

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