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<DIV><STRONG><EM> Ric/JD</EM></STRONG></DIV>
<DIV><STRONG><EM> Even if a compression Crowned board could bend those
short treble ribs into a 60 ft radius it would be negligibly
measurable. SO 25 % of residual crown of that is almost zip. Del
& others have made the case that the upper treble area is driven
primarily by mass & stiffness due to the smaller board area & stiff
ribs... I agree.</EM></STRONG></DIV>
<DIV><STRONG><EM> I crown these ribs as tight as 15 ft but even so on
a 15 inch rib were only talking scant MM or 2. But I like having something to
push against that resembles real crown.</EM></STRONG></DIV>
<DIV><STRONG><EM> Makes sense?</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>Hi
JD<BR><BR>Your understanding of the RC & S board seems pretty solid to me.
One <BR>point I'm less sure on is the amount of compression in the panel after
<BR>the strings are on. The ribs are more solid as you say... and short ribs
<BR>with tight radii are not all that easy to bend. Yet there is a
stated <BR>goal of applying enough downbearing so that 25 % of the unloaded
crown <BR>remains after stringing. That strikes me as equating to a good deal
of <BR>compression in the panel. Looking around these past few days and asking
<BR>questions in a variety of places... I'm left wondering if there IS any
<BR>direct way of figuring just how much compression a given lateral load on
<BR>a beam will build up in the panel. Perhaps its a matter of looking
<BR>around long enough... perhaps it just hasn't been considered directly
<BR>much for the same reasons that tension along the grain of beams doesn't
<BR>seem to attract too much attention in wood engineering
texts.</FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV> </DIV></FONT><BR><BR><BR><DIV><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Start the year off right. <A title="http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489" href="http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489" target="_blank">Easy ways to stay in shape</A> in the new year. </FONT></DIV></BODY></HTML>