<div class="gmail_quote">On Thu, Feb 21, 2008 at 7:25 AM, Mike Spalding <<a href="mailto:mike.spalding1@verizon.net">mike.spalding1@verizon.net</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> John,<br> Don't you also need to know something about the fiber orientation in the<br> CF layup?  Been a while since I played with any of this, but I recall<br> being told by a CF supplier that they can vary the modulus by a factor<br> of 2 or 3 by adjusting the fiber orientation.  Of course, that was in<br> rectangular sections, and maybe the options are more limited in tubular CF?<br> Mike</blockquote><div><br class="webkit-block-placeholder"></div><div> </div></div>Yes, you would need to know the modulus of elasticity.  And from the little bit I've read, MOE will vary with CF material.  It depends on how it's manufactured.  I think the tubes are merely rectangular sections joined together, but I might be wrong about that.  For the CF tubes I've looked at, MOE varies from 18 to 20.3.  Steel is around 28 to 30 depending on the alloy.<div> <br class="webkit-block-placeholder"></div><div>A wise man once told me you can measure the <span class="Apple-style-span" style="font-style: italic;">actual </span>deflection of the lever by using weights attached to a rope, and noting how much it flexes.  Numbers on paper don't always exactly correspond to real life.  Actual deflection would be nice to know.</div> <div><br class="webkit-block-placeholder"></div><div>As I said before, deflection does play a part in how we feel the pin moving, but it's probably less important than we would first think.  (Assuming a good lever -- not el cheapo.)</div> <div><br class="webkit-block-placeholder"></div><div>In my own anecdotal experience with different levers, added mass is sometimes helpful.  It is more tiring after a long day of tuning, however.</div><div><br class="webkit-block-placeholder"> </div><div>-- <br>JF<br><br></div>