I think a half step pitch raise adds almost 4000 pounds of tension. So a quarter step pitch raise (25 cents) should be around 1000 pounds. I should have said "typical" pitch raise not "nominal". But you have a lot more experience with this than I do Joe! On Fri, Apr 2, 2010 at 4:53 PM, Joseph Garrett <joegarrett at earthlink.net>wrote: > Ryan said: > "A nominal pitch raise can easily add 1500 pounds of tension to the > structure > of a piano. I'm not guessing how much or in which ways the structure moves > around, but we certainly know that it does." > > Ryan, > The first statement is NOT true! Of course, you're idea of a "nominal pitch > raise" and mine can be worlds apart. If you were raising pitch, on a modern > piano, from A=435cps to A=440cps, you would add a little more than 500 > pounds overall tension. That I would consider, a "nominal pitch raise". > As for the structure moving, that is an established fact, that can be > proven time after time. How it moves is a whole nuther thang.<G> > Joe > > > Joe Garrett, R.P.T. (Oregon) > Captain, Tool Police > Squares R I > > > > -- Ryan Sowers, RPT Puget Sound Chapter Olympia, WA www.pianova.net -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100402/89ea2a69/attachment.htm>
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