Hey there Steve. Actually... a lot of the confusion comes from the use of just RC and CC as abbreviations. RC boards can have so much compression in them as to be more or less the same as a CC board.... or so little as to become in reality a RC & S board. But to be more specific... the CC term is widely used to describe a board that has flat ribs (flat side glued to the soundboard that is) and relies entirely on the stress interface between the compression built up in the panel as it takes on humidity and tries to expand against the ribs tensioning against it. The whole assembly then bends... or crowns if you will. I suppose we could use RC & CS, CC & CS, and RC & RS for more clarity... but it seems weve settled on CC, RC, and RC & S instead. Cheers RicB Hey Now, Thanks Ric, I think I get the compression thing on a very basic level of course. I was confused about the RC vs RC & S. An earlier post in this bundle used the term Rib Crowned and Supported (RC&S). I was and am following the thread with great interest and learning alot. Thanks for the info. Steve > > Hi Steve. > > RC simply means the ribs themselves are crowned. It says nothing about > how much compression in the panel is use to also support crown against > the downbearing of the string plane. RC & S clearly specifies that the > crowned ribs are doing nearly all that job. The only compression in > that kind of board is present to work against the tendancy of a board to > pull apart during dry periods. > > If you dont understand what compression is about then you are going to > need a more thorough explanation. But there is tons of stuff in the > archives about it. > > Cheers > RicB
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