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<DIV>I am redoing the setup on my excelleron90 also.</DIV>
<DIV>Randy</DIV>
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<DIV><FONT face=Arial size=2>Further reading and testing my Excelleron confirms your comments, Dean. Thanks for the insights, as allways. I have those DuBro things laying here...may just have to re-do the system. Interesting how these seemingly-insignificant things add up.</FONT></DIV>
<DIV><BR>Bob Pastorello<BR>NSRCA 199 AMA 46373<BR><A href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A href="http://www.rcaerobats.net/">www.rcaerobats.net</A></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean Pappas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 29, 2004 10:42 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Elev. Pull pull Question</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Hello Bob,</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Go buy some DuBro # 867 control horns. They have almost 3/4" of overhang between the bolt and the little hole for the clevis, in the little screw-on pieces.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Use those pieces, but set the bolt and nut aside, and see if the little holes line up with the center of the hinges.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>If not, then drill new holes in the black plastic bits so that they do line up: one straight line through both holes and the center of the hinge.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Now when you get the horns all the same length, it will be much easier to get the throws matched in both directions.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>This is absolutely necessary for matching two elevator halves properly, but is also a good idea for rudders.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>The problem with the stock setup is that the cables slacken at the ends, and tighten at neutral.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>While this might sound like a good thing, it is awful: the servo has to fight the tightening cables as the surface comes closer to neutral,</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>then as it gets there, the surface may try to "spring" to the opposite direction.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>The servo and gear train will prematurely beat themselves up chasing this problem.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>You want the cable tension to be almost constant throughout the throw.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>There will be pictures of this when I get the Excelleron review out the door.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>One of the previous posts pointed to a website that showed the proper geometry.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>DuBro and Rocket City both make parts that are useful, for this problem.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Check DuBro.com and put #867 into their search engine, you can see the lonng overhang part. It's either 5/8" or 3/4" from bolt to clevis hole.</FONT></SPAN></DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=494275614-29112004><FONT face=Arial color=#0000ff size=2>Later,</FONT></SPAN></DIV>
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<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman">d.pappas@kodeos.com</FONT> </P></BLOCKQUOTE></BLOCKQUOTE></body></html>