>Sorry, that wasn't very clear... was it? I meant a wide board and very long >too -9'3" I think - can't remember seeing a cut-off bar either. The ribs are >short in height, and a bit thick. I have real concerns about the longevity >of these pianos especially if there is little or no crown! > >Cheers >Mark Bolsius Let's do a general rib nomenclature alert first, since this seems to come up occasionally. If we use "long" and "short" for the end to end "length" of ribs, "thick" and "thin" for the "height", and "wide" and "narrow" for the "width", when someone says the ribs are short, thin and wide, there's a minimum of confusion - theoretically. I'm not so sure there's a longevity concern here. If there is in fact little to no crown in these pianos, then the intended soundboard impedance isn't produced by high compression levels in the panel, but rather by the multitude of ribs. If the panel isn't under high compression levels, the assembly doesn't have the built in self destruct mechanism of a compression crowned board. If there's no unnaturally high strain being placed on materials incapable of supporting it in the long term, the life of the structure should be comparatively long. Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC