<HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META charset=US-ASCII http-equiv=Content-Type content="text/html; charset=US-ASCII"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #ffffff"> <DIV><FONT face="MS Sans Serif">Del,</FONT></DIV> <DIV><FONT face="MS Sans Serif"></FONT> </DIV> <DIV><FONT face="MS Sans Serif">You're absolutely right - That was a broad generalization, only true under certain specific conditions.  I was careless in my wording.  What I wanted to say was:   heavy hammers transfer a greater percentage of their kinetic energy to the string than lighter hammers.  </FONT></DIV> <DIV> </DIV> <DIV><FONT face="MS Sans Serif">Mike</FONT></DIV> <DIV> </DIV> <DIV></DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid"> <DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=fandrich@pianobuilders.com href="mailto:fandrich@pianobuilders.com">Delwin D Fandrich</A> </DIV> <DIV style="FONT: 10pt arial"><B>To: </B><A title=spalding48@earthlink.net href="mailto:spalding48@earthlink.net">spalding48@earthlink.net</A>;<A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A></DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> 4/23/2004 11:21:42 AM </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Resilience and energy transfer, was Acetone</DIV> <DIV><BR></DIV><FONT size=2> <DIV><FONT face="Comic Sans MS" color=#000080 size=3></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]<B>On Behalf Of </B>Michael Spalding<BR><B>Sent:</B> April 23, 2004 3:57 AM<BR><B>To:</B> oleg-i@noos.fr, Pianotech<BR><B>Subject:</B> RE: Resilience and energy transfer, was Acetone<BR><BR></FONT></DIV> <DIV><FONT face="MS Sans Serif">Isaac,</FONT></DIV> <DIV><FONT face="MS Sans Serif"></FONT> </DIV> <DIV><FONT face="MS Sans Serif"><SPAN class=718481117-23042004><FONT face="Comic Sans MS" color=#000080 size=3> .... </FONT></SPAN>Heavy hammers transfer more energy to strings than light hammers.</FONT></DIV> <DIV><FONT face="MS Sans Serif"></FONT> </DIV> <DIV><FONT face="MS Sans Serif">Mike</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080 size=3></FONT></DIV></BLOCKQUOTE> <DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=3><SPAN class=718481117-23042004></SPAN></FONT> </DIV> <DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=3><SPAN class=718481117-23042004>This is broad generalization that is true only if the velocity of the two hammers stays the same, or at least approximately the same, for a given key strike. They do not. When a relatively light hammer is replaced with a heavier hammer and the key is struck with a given amount of force the velocity of the heavier hammer will be less. How much less is a function of the specific action compliance and transfer efficiency.</SPAN></FONT></DIV> <DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=3><SPAN class=718481117-23042004></SPAN></FONT> </DIV> <DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=3><SPAN class=718481117-23042004>Del</SPAN></FONT></DIV></FONT></BLOCKQUOTE></BODY></HTML>