Phillip Ford wrote: > FWIW. The number is 32.2 fps^2 (9.8 m/s^2) at the earth's surface. > > http://www.tcaep.co.uk/science/constant/detail/gravityaccelerationdueto.htm > > Gravitationally, > > Phil F > Thanks Phil, Maybe I have this wrong could you help? The leads in a key lighten the touch when the key is pushed slowly. So for soft playing it looks like they assist in playing the key. At what point do the leads begin to hinder the touch? I am making an assumption but it looks to me like they help up to the point they are accelerated past the speed they would fall. After that additional energy needs to be applied to move the lead faster. As a key is played faster and faster more of it begins to accelerate past the falling point. A lead out toward the end could be hindering the touch and a lead near the balance point would still be helping to depress the key. Please excuse me for making a few uneducated guesses I know it's not the usual high level math and science found on this list. I would be glad if someone could straighten me out on this. John Hartman RPT John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] Rebuilding Steinway and Mason & Hamlin Grand Pianos Since 1979 Piano Technicians Journal Journal Illustrator/Contributing Editor [link redacted at request of site owner - Jul 25, 2015]
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