Mark Davidson wrote: > > Ricb wrote: > > >Nice stuff Mark. I would think a few hundred such samples > >would be a good basis for a real meaningful data base > >from which to start drawing conclusions. > > Isn't that about the number of pianos you have there at the conservatory? > Or maybe we could do something like a "Piano key inertia road show" where > people bring their old pianos in and we measure their key MOIs. We have fifty five right now. 18 grands. Still.. its a start. Maybe a few of us should agree on means and standards and actually compile a d-base to see what pops up ?? > > >How do you explain the FW's being higher values then > >MOI in the bass, and then lower for the rest of the piano ? > > Not sure there's any real relationship like that. Measuring different > things, different units, etc. I just put them on the same graph because it > helps to see that yes, the big dips and bumps do come at the same places. > Also remember that an unleaded key is almost balanced - the FW results > mostly from lead, while only about 30-40% of the key inertia in the bass is > due to lead, so these curves will look a bit different. Key inertia will > never go much below 20 kg cm^2. (Different slopes and Y-intercepts, your > math teacher would say) I'm sure. But still... if that same thing keeps on showing up piano after piano ... then I'd be curious as to a more definitive explaination as too why. > > -Mark > > RicB
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