Killer Octave Question - S shape theory

[Farrell]

Hello Isaac: I have a 1900 180cm (or so) Bechstein grand waiting for remanufacture in my shop. It also has a very impressive and prominent "S"-shaped profile to the soundboard (perpendicular to the long bridge) in the killer octave area. When I take it apart I will need to cut through the board perpendicular to the bridge and get a good photo with a straight-edge next to it.

Terry Farrell
  
----- Original Message ----- 
From: "Isaac OLEG" <oleg-i@wanadoo.fr>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, April 19, 2003 6:33 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)
> 
> This is new to me (and not at all German for what I've heard yet !)
> 
> I'll keep that following soon.
> 
> Isaac OLEG
> 
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> 
> > -----Message d'origine-----
> > De : pianotech-bounces@ptg.org
> > [mailto:pianotech-bounces@ptg.org]De la
> > part de Ron Nossaman
> > Envoye : samedi 19 avril 2003 07:38
> > A : Pianotech
> > Objet : Re: Killer Octave Question
> >
> >
> >
> > >Besides, it doesn't really need to serve this function. It
> > is quite easy to
> > >build any needed crown supporting capability needed into the ribs.
> > >
> > >Del
> >
> > Absolutely. Even the dreaded math necessary to figure the
> > load support
> > requirements and expected characteristics of each
> > individual rib isn't that
> > scary once you've worked it out.
> >
> > Ron N
> >
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