> The nominal C88 standard for the Hamburg D used to be 53 mm. They appear > to have reduced their C88 length to 49 mm in their latest iterations > (since at least 2000). I'm rebuilding a circa 2000 piano at the moment - > in which we're completely re-scaling the treble sections. > > Their latest Ds are heavier in the hitch plate area (which I prefer), > and the scale is fully revised to be shorter than previously, but still > does not conform to an accurate log-style scale. While overall it looks > to conform more or less to log style, there are significant note to note > variations. The breaking percentage with the new scale is even lower > than previously at note F21. So I don't suppose we can expect to see a > scaling improvement in the clones any time soon. Wonderful... advancing to the rear. > I also note that some piano 'designers' have been known to shift the > front pin row instead of the back pin row, to avoid intersection > conflicts. They should be referring to some basic piano-design 101 rules > here. The disastrous effect this practice has on tunability and > stability should be more than obvious. Yamaha moves the entire unison in some models, maintaining the row spacing at the expense of the length progression. I haven't taken a scale from one of these, so I can't say what it does to tensions and break%. As I recall, it's done at a wire size change, so the tension changes may be minimal. Ron N
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