So let me get this straight... You are stating outright, an RC & S board that in unloaded state has known values for rib dimensions and radii and panel compression of basically zipp diddly at glue up MC.... that in this state... the application of a known degree of downward stress (derived from residual crown and the above already knowns) has no direct relationship on how much panel compression results ? Cheers RicB I can see that you don't. Percent is a meaningless measure of compression in this case. David Love davidlovepianos at comcast.net www.davidlovepianos.com I dont see the relevance to the question about how much compression gets imparted into the panel when a given RC&S board gets subjected to enough downbearing to reduce its crown to 25 % (
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