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

[David Love]

One other comment.  I think it's very likely that the RC&S board is more
predictable and controllable and takes stress off the panel which
increases longevity of the system for all the reasons previously
mentioned.  I'm all for controllability, predictability and longevity.
However, what I would like to know (without having to take on the
impossible--for me at present--task of trying to build two boards in
order to compare), is whether, all other things being equal and for the
period that they are functioning to their capacity, the RC&S and the CC
board are acoustically equivalent.  No value judgments here.  I've heard
both and both will produce good sounding pianos.  But do they produce
equivalent sounding pianos.  This question is somewhat rhetorical,
though please feel free to answer if so inclined.  The engineering
issues are one thing, the acoustic result of those engineering decisions
may be another.  And if they both produce good sounding pianos but
different sounding pianos, it might be good to get a handle on what
those differences are.  Or maybe I'm just chasing the untamed ornithoid.



David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of David Love
Sent: Sunday, February 13, 2005 9:24 PM
To: 'Pianotech'
Subject: RE: More CC vs RC questions was RE: Killer Octave & Pitch Raise

If I may try to answer my own question having read back through this
thread.  The stiffness of the panel is produced by applying whatever
downbearing is required to achieve it.  The difference being that the
ribs take the stress of supporting the bearing over time rather than the
panel and therefore the stiffness of the panel is likely to hold up for
longer avoiding the inevitable compression set if the panel were
supporting the bearing alone.  

OK.  So do you then have to compress the RC&S panel more to achieve the
same stiffness as the CC panel because the CC panel has a bit of a head
start, as it were?

And just how flat can you squash the RC&S board before you run the risk
of a problem, assuming you think you might need to squash it flat in
order to achieve a desired tonal quality.  

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of David Love
Sent: Sunday, February 13, 2005 9:05 PM
To: 'Pianotech'
Subject: RE: More CC vs RC questions was RE: Killer Octave & Pitch Raise

Not to belabor this point, but just to clarify for my own understanding
(because this point confuses me), if the ribsets support all the bearing
as if the panel wasn't there, how does the panel achieve the requisite
stiffness to do what it needs to do?

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Ron Nossaman
Sent: Sunday, February 13, 2005 8:13 PM
To: Pianotech
Subject: Re: More CC vs RC questions was RE: Killer Octave & Pitch Raise


>AHEMMMMMMM!   I believe you three are the only ones designing primarily
rib
>crowned and supported soundboards. But I do not think you three are
the
>only ones building that type!
>
>Geeeesh! I don't get no respect around here!
>
>Terry Farrell


Yea, you're right, you got me. Clumsily worded - sorry. BTW, I got one
of 
those pretty B panels you made for me ribbed Saturday with another of
those 
rib sets designed to support bearing as if the panel wasn't there at
all. 
Bridges are roughed in, laminate capped, and marked for drilling.
Tomorrow 
afternoon, I'll locate them on the soundboard with the plate, and... I'm

looking forward to hearing this one when it comes together.

Ron N

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