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<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
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size=2><BR>Dale,<BR>Those ribs were originally built into a CC board. How can
a <BR>compression crowned board get mechanical support from the rib <BR>scale,
however "good" the scale looks? The ribs in CC boards <BR>resist the crown
that panel compression is trying to form and <BR>maintain, and just put more
compression load on the panel. </FONT> -----Ron</BLOCKQUOTE>
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<DIV> No, I get all that Ron, but if the ribs are built significantly
taller & of stiffer material by design then more panel
compression can be taken out of the equation. Another thought is, &
I've witnessed this quite a few times is, that Stwy A's (1 & 2"s) in
general can produce a pretty wonderful sound even with a flat or
flattish board providing there is some small but consistent bearing load
still intact so in this case it would seem that there are enough impedance
factors about the rib scale to make the system work rather well. Ok maybe a
freak of nature but it happens fairly frequently. </DIV>
<DIV> About 5 years back I had such an long A I was going to
resell it. It had Steinway hammers which were quite soft & made
it sound really good. It was hard to imagine that a new board would make
it sound much better. It truly sounded glorious but it was a spec job
& I don't sell old boards very often. I didn't do any thing to the
action until later for a really good A b comparison.</DIV>
<DIV> So I built a board with the same number of ribs
making them crowned at about 60 ft. Made em taller but not much. Used sugar
pine in the bottom & yellow pine in the top. The sound was
cleaner and the sustain was about the same which was awesome. It just
had it!!</DIV>
<DIV> I attribute much of this to the original basic rib scale
design. Something was working or several things were. Do you see what
I'm saying?</DIV>
<DIV> I'll crunch some numbers & see what I got. I greatly
Appreciate the design sharing & information swap.</DIV>
<DIV> Thanks</DIV>
<DIV> Dale</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2><BR>It's
an entirely different system. Do a bearing load analysis <BR>on the ribs as
load carrying beams and see what the numbers <BR>say. They'll say that the rib
scale isn't adequate to support <BR>bearing without substantial panel
compression support.<BR><BR>Ron N</FONT></BLOCKQUOTE>
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