Touchweight Goodie

[Richard Brekne]

Richard Brekne wrote:


Another little point thats interesting to see is that a 6.0 ratio 
comprised  of different top action / KR values doesnt  end up yielding 
the same BW with all other values being  equal

Put 12 in for top action ratio, and 0.5 for KR... yeilding  a 6.0 
balance weight ratio... or SWR if you like. Observe the resulting BW's 
on the far right collum.  Then put int 11.12 for top action ratio and 
0,54 for KR... also yeilding a 6.0 overall ratio.... and note that the 
resulting BW is nearly 1 gram higher.

Perhaps 1 grams difference is slightly less the of earth shaking 
significance... but it does clearly show that the Stanwood Balance 
Equation doesnt quite show as clear a picture of the weight 
relationships in the grand action as we thought.

http://www.pianostemmer.no/files/kr-to-bw-effect.xls

Cheers
RicB