Key Leads and Inertia

[A440A@aol.com]

 Richard  writes:

<< If we simply know some general consequences for
various configurations of key leading... those can be made to conform to just
about any given FW specification easily enough... or what ? >>

The leads that are closer to the center of the key will move less distance 
and at a slower inch per second rate than leads out at the end.  Since the  
inertial effect of mass  seems to be exponentially linked to speed,   keys so 
leaded should demonstrate less inertial resistance to heavy playing than 
those that is not.  
   I have found that leading the keys inboard like this,(part of the original 
Steinway "Accelerated Patent) makes for a better feeling action.  I think 
this is because of less change in inertial resistance as the force of the 
playing increases.  

And just for fun,  If we accept that key bending is setting the limit on 
power an action is capable of, the leads in the center of the key will still 
be moving when the front of the key has hit the punching.  (if the key is 
flexible enough to bend under a heavy stroke, then the portion of the key 
near the balance point will lag behind the outer extreme end,no?) .  So,  it 
may be that the key with the leads near the balance point will function as a 
mechanical capacitor, releasing energy after the end of the key, (and finger) 
has stopped moving.  



Ed Foote RPT 
www.uk-piano.org/edfoote/
www.uk-piano.org/edfoote/well_tempered_piano.html