Greetings all, I read with interest the postings concerning crown and the rim influence on it. I have often wondered if a bridge attached to the ribs, with no soundboard would be able to withstand the down pressure. I am skeptical that the soundboard itself, what with soft thin wood, actually provides much support. That a board is still crowned with glue joint failure around the rim doesn't tell me much. Would not the joints of the ribs to rim actually have a lot more bearing on crown maintenance? From a structural standpoint, the principle of arches seem to describe the transfer and containment of bearing pressure. When you vector the downward force from an arch, you see that there is a transfer of pressure from straight down to a more lateral direction, where the pressure meets the case, ( and any centripedal apparatus that may be in the area.......(:)}} So, has anyone ever considered that the ribs alone might support a bridge, and the soundboard itself does very little? Or to ask another way, how long would a board remain crowned if there were no ribs? Regards, Ed Foote
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