Renner "Turbo Wippens" ?

[A440A@AOL.COM]

 Hi all, 
<feels the warm toasty of a glowing ember here.....(:)}}>
I wrote
 
>>   the additional
>>spring will allow an action to be biased toward a lighter feel, but if they
>>are used in an attempt to correct geometry problems, the piano will >>still
feel unresponsive.

And Bill responds
  
<big snips>. 
>Although the springs may change the feel of and action with bad
>leverage or mass, they will not change those aspects of the feel having >to
do with bad mass or leverage. Helper springs should  not be chosen >because
they can correct bad leverage. They won't. You may be able to >use the change
in feel they may offer in a situation of bad leverage, but >don't use them
because you think they'll clear up a leverage or >hammer weight problem. They
won't.
     
    Bill spoke to the problem more clearly than I did, but I think that is
what I was trying to say.  If springs are needed, it is usually because the
hammer is too heavy for that action, and if this is the case, "the piano will
still feel unresponsive". 
      The springs do not change the initial inertia that is felt under
fortissimo playing, thus it seems that the power saturation levels would still
be lower if they have been used to compensate for a hammer that is heavier
than optimum. ( that is probably a separate thread). 
    I suppose we should have a dialogue on that term, "responsive".  I really
think that is at the heart of all we do in the action. It combines action
weight, friction, inertia, hammer hardness, etc and balances them all against
the "wet-ware", ( pianists expectations......)
Regards, 
Ed Foote
(trying to be responsive himself..........)