Dennis, Inertia is a function of mass and velocity. My system describes mass as strike weight and velocity as strike ratio in terms that are usable by piano makers and technicians. Hammers have evolved to an upper limit that is very well defined by the weight of Steinway concert grands and which correlate very closely with my "full" projection zone. Is there an argument with what is used on 90% or so of all performance pianos? David C. Stanwood
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