<DIV>John,</DIV>
<DIV>I don't know how much key leads really affect moi in the total picture of things, since the leads serve at least two purposes; one, as a "counter weight" to what weight there is bearing down at the capstan, and two, as moi regulator of sorts. But the leads seems to affect the total moi more than it appears.</DIV>
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<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Vince,<BR><BR>I am not sure what your customer is relating to but the evidence seams <BR>to be that adding leads to the keys does not raise the total MOI of the <BR>action very much. This is because the increase in angular motion from <BR>the key to the hammer increases the Moi of the hammer much more than <BR>than than the 5/1 leverage we usual think about.<BR><BR>I figured the MOI for the three action parts of a typical note. The <BR>hammer was 8 gms and there were three leads in the key. The front arm of <BR>the key was 25cm and action leverage was 5.3/1 with a BW of 35gms. Here <BR>are the number for the MOI as adjusted for reflected MOI:<BR><BR>Key MOI = 10,307 gmcm^2<BR>Wippen MOI = 3149 gmcm*2<BR>Hammer and shank MOI = 165,528 gmcm*2<BR><BR>There may be many virtues for keeping leads out of the keys but I can't <BR>see how it makes very much difference to the perceived weight
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