<pre style="color: rgb(0, 0, 0); font-size: 9pt;"><tt>Jim</tt></pre><pre style="color: rgb(0, 0, 0); font-size: 9pt;"><tt> Nick is making a rib crowned board of some kind...right Nick?  </tt></pre><pre style="color: rgb(0, 0, 0); font-size: 9pt;"> Most of the time I am talking about a rib crowned system dried to no more than 5.5 %. or 6% depending on where it goes</pre><pre style="color: rgb(0, 0, 0); font-size: 9pt;"><tt>I also make rib crowned and supported boards. Both have styles have far more initial crown than C.C. boards.</tt></pre><pre style="color: rgb(0, 0, 0); font-size: 9pt;"><tt>Apples, oranges, apples , oranges...bananas?.... I like em all </tt></pre><pre style="font-family: 'Comic Sans MS', sans-serif; color: rgb(0, 0, 0); font-size: 9pt;"><tt> </tt></pre><pre style="font-family: 'Comic Sans MS', sans-serif; color: rgb(0, 0, 0); font-size: 9pt;"><tt>One difficulty in this discussion is that Nick is (correct me if I'm wrong, Nick) talking about a CC system, and I am talking about a Rib crowned system. I think Dale may be referring to a hybrid system. If we talk of 3 different structural systems as if they are the same structural system, thing get mushy...an apples and oranges thing. Jim Ialeggio</tt></pre> <div style="font-family: 'Comic Sans MS', sans-serif; clear: both;">Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos www.Erwinspiano.com Phone: 209-577-8397 <tt><tt>     </tt></tt> </div> <div style="font-family: arial, helvetica; font-size: 10pt; color: black;">-----Original Message----- From: Jim Ialeggio <jim@grandpianosolutions.com> To: pianotech <pianotech@ptg.org> Sent: Sat, Dec 1, 2012 12:39 pm Subject: [pianotech] Belly talk <div id="AOLMsgPart_0_a899b52f-e354-433d-b339-2a24c8ddf548" style="margin: 0px;font-family: Tahoma, Verdana, Arial, Sans-Serif;font-size: 12px;color: #000;background-color: #fff;"> <pre style="font-size: 9pt;"><tt>HI Dale < In the case cited the piano in question was an Stwy A-2 and having done quite a few A-2s both ways... Right. This is where the complexity of the system in general and each individual belly comes into play. I can see a reasoning why the sound might be a little different between the single and double crown, but I really don't think I would attribute it the 3 dimensionality of the system as Nick is suggesting. Rather I could see it as distributing the tail "bend down" in a more evenly trended fashion across more of the long bridge rather than localized at just the tail. I used to attribute more stiffness to the shape of the crown itself. But after watching these things behave in and out of the piano the crown shape in and of itself, at least in a minimally compressed rib crowned board, really does not seem to be doing much in and of itself. As I say, this was not my opinion originally but it certainly is where I'm going right now..at least until suppertime<G>. However, to be clear my opinion is being formed regarding the RC&C structure in particular, not a compression system. One difficulty in this discussion is that Nick is (correct me if I'm wrong, Nick) talking about a CC system, and I am talking about a Rib crowned system. I think Dale may be referring to a hybrid system. If we talk of 3 different structural systems as if they are the same structural system, thing get mushy...an apples and oranges thing. Jim Ialeggio -- Jim Ialeggio <a href="mailto:jim@grandpianosolutions.com">jim@grandpianosolutions.com</a> 978 425-9026 Shirley Center, MA </tt></pre> </div>  </div>