An excerpt from my book Pianos Inside Out illustrates that the hammer slows down (the distance it travels every two millimeters of key travel becomes shorter) as the key reaches the let off point. By my observations from this series of photos, also confirmed by my measurements, in this action...
Book_p284.pdf
See matching posts in thread - It requires setting up a hard landing for the ke...
See matching posts in thread - As part of these discussions I set up an action ...