What's all this I hear about Inertia ?

[David Love]

I see you're still having trouble with the math.  If you change the FW then
the BW changes in the opposite directly so any change in the FW will not
change R.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Richard Brekne
Sent: Monday, October 06, 2008 2:58 PM
To: pianotech at ptg.org
Subject: What's all this I hear about Inertia ?

Greetings:

    Then we're defining ratio differently (not to speak for Fenton). 
    Changing the front weight has nothing to do with the action ratio. 
    I believe what Fenton referred to was replacing lead with help from
    the assist spring. Then you do have the same hammers, ratio, BW,
    different leading, because the assist spring takes the place of some
    of the lead.  The action would therefore have lower inertia.  

    David Love

I see you haven't quite understood the balance equation correctly David. 
Changing the Front Weight most certainly and undeniably does change the 
(SW) ratio. A most casual of glances at Stanwoods formula reveals this. 
Again...this is part of why you will find any direct translation to 
another protocoll... the distance one for example... quite difficult at 
best.

Review Stanwoods formula.   R =  (BW + FW - WW) / SW

Clearly a change in FW changes the value of the entire left side of the 
formula, and hence the equivalent  R on the right side.

Cheers
RicB