Killer Octave Question - one of those Erards !

[Isaac OLEG]

Hello,

If some are interested, I have some pictures of a simple Down bearing
gauge showing front and back bearing on a 1907 Erard (OK a straight
strung one)- have a nice 3 or 4 mm crown.
The piano was located under a glass roof for many years, have a very
large crack, and ribs un glued.

Does not prove much (and was of course ribbed with crowned ribs at
this time I guess)


But still a very nice tone

Best to all

Isaac OLEG

Entretien et reparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de A440A@aol.com
> Envoye : jeudi 10 avril 2003 02:44
> A : pianotech@ptg.org
> Objet : Re: Killer Octave Question
>
>
> Greetings,
>    The killer octave is usually supported by the section of
> belly rail that
> is farthest from buttressing.  The normal connection of the
> plate to the
> belly rail at the plate's "horn" provides resistance to
> outward movement, and
> the rails connection to the case at the treble end,
> likewise.  However, the
> ribs that must support crown under the killer octave bear
> against the
> bellyrail at its greatest unsupported span and it just
> might be one reason
> that this section of the piano loses its bearing first.
> (The rib under the
> C5 on a Steinway O meets the bellyrail approx. halfway
> between the plate horn
> and the treble end of the rail).
>    Many other reasons could go into the equation, too.
>
> Ed Foote RPT
> www.uk-piano.org/edfoote/
> www.uk-piano.org/edfoote/well_tempered_piano.html
>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>