Hmmm. 54 pounds per cent. Ok. I hadn't thought to make that formulation but as you said it is interesting enough to make the effort worth the it I think we are looking at plate flex at this level. Board flex is negligible. Al Sanderson proved that by measuring the notes of an upright, removed the bass strings remeasured and plotted the differences. The middle section went up some and then down toward the treble brace but dropped to 0 at the other side of the brace. That proved to me it is all plate compression not board compression. Neat little trick he pulled. He just put the graph up, said how it was obtained. I looked at that for a few seconds and then the flashbulb went off. Al had been contending this for years and I didn't believe him until I saw that graph. Q.E.D. I just love graphs. A column of numbers is not informative to me but graph it and I grasp it. Have a nice day friend. Newton
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