Killer Octave Question - S shape theory

[Farrell]

I must say that my S-shaped soundboard Bechstein is about the thinnest sounding pianos I have ever heard!

Terry Farrell
  
----- Original Message ----- 
From: "Delwin D. Fandrich" <pianobuilders@olynet.com>
To: <oleg-i@wanadoo.fr>; "Pianotech" <pianotech@ptg.org>
Sent: Saturday, April 19, 2003 2:09 PM
Subject: Re: Killer Octave Question - S shape theory


> 
> ----- Original Message -----
> From: "Isaac OLEG" <oleg-i@wanadoo.fr>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Saturday, April 19, 2003 3:33 AM
> Subject: RE: Killer Octave Question - S shape theory
> 
> 
> > I repost that as I will have a discussion with a colleague about it.
> >
> > S shape as took by the soundboard under the bridge in the killer zone
> > being seen as a valuable profile from a stability point of view,
> > bridge top being shaped in prevision of this set. I believe that one
> > can eventually compute or ascertain where the inflexion point will be
> > installing under the load.
> >
> > Reflex ion after having seen that harpsichord builders are supposedly
> > wanting this shape to install on their soundboards, for the same
> > stability reason (resistance to moisture change)
> 
> I shouldn't think the S-shaped soundboard distortion found in many, if not
> most, pianos possesing compression-crowned soundboards can be considered a
> desirable feature. Or something that would be designed into either the piano
> or the harpsichord. It is the natural result of the compression-crowning
> technique being used to make an overly large soundboard and then loading
> that soundboard along an off-center bridge.
> 
> Del
> 
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