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<DIV> <STRONG><EM>RIc</EM></STRONG></DIV>
<DIV><STRONG><EM> In my practice when someone orders a An RC
board the ones I make will transfer much of the load bearing capacity to
the ribbing. Be aware that in my RC boards the ribs are made taller
& of stiffer materials with tight radii The compression componenet will
vary between 5 to 5.5% mc at time of pressing depending on what type of climate
the piano is going to. Nevada/Arizona etc. gets the lower
MC & the bay area gets 6% or higher. In either case, because of
prevailing MC in the mentioned climate, the panel compression will end up being
roughly similar at there final destinations. Customization is great. If I
had to ascribe a percentage of crown support from this type of board I'd just be
guessing at 20 to 30% as opposed to a purelly C.C. design.</EM></STRONG></DIV>
<DIV><STRONG><EM> All boards must benefit from the interface..hey it's a
form of plywood. Beyond that it's many variable dynamic stresses in the panel
that make it work....or not.</EM></STRONG></DIV>
<DIV><STRONG><EM> Dale</EM></STRONG></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>A RC
board can be said to have curved ribs... but beyond that it can <BR>either
rely largely on panel compression and the stress interface this <BR>creates
with the ribs, or it can be a pure RC and S board. All depends <BR>on
how much compression the whole assembly process ends up putting into <BR>the
board.<BR><BR>Cheers<BR>RicB</FONT></BLOCKQUOTE></DIV>
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