Hi Dave It doesnt, thats the whole point. The ribs take care of all this. When the panel is glued to the ribs the entire assembly takes on enough stiffness to do the job. But the panel itself plays a much less important role in this regard. All this is predicated on the idea that that panels main job is to move the air via a stricktly transverse vibrational behaviour, and to provide a platform for the bridge and ribs to each do their respective jobs. In the CC board, the panel takes on much more responsibility for both the total stiffness of the assembly, and crown support. Just how much the ribs do or do not support crown in this system is IMO still an open book. I see a lot of declarations about what is or isnt true, but I've yet to see anything conclusive. Cheers RicB Not to belabor this point, but just to clarify for my own understanding (because this point confuses me), if the ribsets support all the bearing as if the panel wasn't there, how does the panel achieve the requisite stiffness to do what it needs to do? David Love
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