Soundboard drydown for installation

[Richard Brekne]

Hi Terry.

This is another bit that has bothered me ever since Ron's experiment 
article.  On the one hand one states that the edges of the panel will 
simply crush as it attempts to expand when constrained in the fashion 
the <<buttressed arch>> idea employs.  Yet Ron reports that the panel 
thus constrained simply didn't take on any crown. These two strike me as 
mutually exclusive.  If the edges indeed would simply crush when 
subjected to such pressure ... then what would prevent his experiment 
board from crowning ?  If the edges are strong enough to keep the panel 
from crowning, then it would seem to me that they are strong enough to 
help support crown if they were first asked to..... which of course is a 
different question all together.


    'Course, none of this actually works - the ribs won't shrink much,
    the panel
    top edge will just crush when it expands the 1/10 mm that it might
    move and
    the rim has enough flex to negate any "arch" support.

    Terry Farrell