Thumpy writes: Yeah yeah Ok sure. But none of this changes the fact that if you stressed the board into an exaggerated crown, then permeated the ribs ( and board, maybe ) with something that rersists compression, you ought to end up with better crown when you "knock the chocks out". T No argument on that point. P.S. Still, that rib matter has to go somewhere when the board loses crown. Either the rib is compressed longitudinally, over the decades, shrinks, or the rim expands. Probably a combination of all three. This is simpleton stuff. You might at best experience a little end grain crushing from any constraint from the rim. And we are talking reallllly small amounts. As far as being compressed in the face of the soundboard panel itself going flat... well I'm open for any data you might have, but the relative stress levels the rib and panel can handle would kinda indicate to me that you are probably in error. Not to worry tho... that same argument is used to tell me that I am entirely wrong about ribs supporting crown in a CC board to begin with. Back to your point about rim expanding or rib compressing... you ever try that experiment Nossaman sketched a couple years back ... the one about checking out the buttressed arch concept ? I found that rather enlightening myself. Cheers RicB
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