C.Lose Square Piano

[Richard Brekne]

Hi Dale

I suspect you are probably right, and that the general idea was a flat
board with minimal support from the ribs. That being said, they always
seem to fail at the same place, so I just thought maybe it was possible
to brace the panel a bit stronger in that area, and add just a little
bit of crown.

I am not really sure, of course just how much impact that will have on
the sound...ergo I'm asking for feedback and advice. I take it you mean
that I should probably stick to basically the same configuration as the
origional ??

Cheers
RicB

> Erwinspiano@aol.com wrote:
> 
>  Richard.Brekne@grieg.uib.no writes:
> 
>      Hi Joe
> 
> 
>      As far as the reasoning for the ribs... take a gander at
>      this picture with the shape of the bridge roughly drawn in.
>      Seems to me they were maybe thinking that this ribbing
>      pattern would support the bridge area against downbearing.
>      One rib traces the bridge almost dead underneath for most of
>      the bass lower treble. The two longest ribs run on either
>      side, and along with the cross rib they perhaps were meant
>      to hold the whole area up.
> 
> 
>   Ric ,your assuming that maker added any appreciable downbearing at
> all to the system.  After working with so many good sounding uprights
> over the years which had negligble bearing it may be safe to say that
> that most uprights are mainly  mass driven systems not requiring much
> ribbing support except to keep the board more rigid even though it's
> flat.  I suspect your square & many like it are the possibly the same
> kind of concept.
>   Dale





-- 
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html