<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; = FONT-FAMILY: Arial" bottomMargin=7 bgColor=#ffffff leftMargin=7 topMargin=7 = rightMargin=7> <DIV><FONT size=3>If I understand rib tapering theory correctly (and = maybe I don't - so please correct me), the straight tapering that Del and Ron O = use is based on engineering principles that suggest such a design will best = support a centered load more-or-less evenly along the length of the rib (and = allow freedom of movement at the ends). Whereas the constant thickness rib = with the sculpted tapers at the ends lends itself better to a compression-crowned = soundboard where the constant thickness of the rib will tend to induce development of consistent crown as the panel hydrates (and allow freedom = of movement at the ends).</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>I realize there is everything in between also, but = isn't that the big picture?</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>Terry Farrell</FONT></DIV> <DIV> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><FONT id=role_document face=Arial color=#000000 size=2>  By the = way you sent this thru last week & I didn't have time to say it was very well = described & if one takes time to really anaylisze the dynamics of = this rib design the vibrational effiecncy of this shape  rib = seems ... transparent.  </DIV> <DIV> <DIV>   The way you described it made it crystal = clear in my thought process  & I hope others.  I catch on quick = after a long time!</DIV> <DIV>  What about using the same approach with a solid rib.  The only difference in our procedure as to shape =  has been not using as much of a straight taper at the rib end. </DIV> <DIV>    Vibrational waves emanating at the bridge = & radiating outward is all s.o.p. thought and this rib design whether it = be laminated or not seems to aid the idea of the soundboards center as = the starting point for vibration & also showing the most movement. = </DIV> <DIV> </DIV> <DIV>  Dale</DIV></DIV></BLOCKQUOTE></FONT></BODY></HTML>