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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;I have done it on a World Model
Super Sports Senior. The plane weighs 8 lbs and the bell crank was made by
World Models. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;Five years and it still works
perfect with no wear, no slop.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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face="Times New Roman"><span style='font-size:12.0pt'>

<hr size=2 width="100%" align=center tabindex=-1>

</span></font></div>

<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>vicenterc@comcast.net<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 13, 2008 7:35
AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">General
 pattern discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Rudder pull-pull</span></font><o:p></o:p></p>

</div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Have someone done the rudder bell crank system in a pattern plane?<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>--<br>
Vicente &quot;Vince&quot; Bortone<o:p></o:p></span></font></p>

</div>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>-------------- Original message -------------- <br>
From: &quot;Lance Van Nostrand&quot; &lt;patterndude@tx.rr.com&gt; <o:p></o:p></span></font></p>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Jim,</span></font><o:p></o:p></p>

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<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I've done this on heavier IMAC style planes but never
thought it could be done light enough for pattern.&nbsp; If you have thoughts
on this, I am interested.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,</span></font><o:p></o:p></p>

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<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>--Lance</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>

</div>

<div style='font-color:black'>

<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jnhiller@earthlink.net" title="jnhiller@earthlink.net">J N Hiller</a>
<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">General pattern discussion</a> <o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Sunday, May 11,
2008 8:58 PM<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re:
[NSRCA-discussion] Rudder pull-pull<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

</div>

<p class=MsoNormal><span class=EmailStyle21><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Lance I use a bell crank to get equal length arms and
control horns. This allows continued use of full servo travel and removes the
cable tension from the servo shaft and mounting grommets. The servo is
connected with a short link with ball end fittings. It works well especially on
elevators.<o:p></o:p></span></font></span></p>

<p class=MsoNormal><span class=EmailStyle21><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Jim Hiller<o:p></o:p></span></font></span></p>

<p class=MsoNormal><span class=EmailStyle21><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>&nbsp;<o:p></o:p></span></font></span></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> <a
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>Lance Van Nostrand<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, May 11, 2008 5:38 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">General
 pattern discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Rudder pull-pull</span></font><o:p></o:p></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>You all
are so fast on this stuff that by the time I read the post the thread is old.</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Ackerman
exists if the rudder has control horns (as opposed to a wheel, which is very
hard to build into a rudder).&nbsp; The only ideal way to have constant tension
is to use a symmetrical servo arm that is offset from its pivot (servo screw)
the same amount as the rudder control horn attachment point.&nbsp; This will
work every time and is simple, however with a 1&quot; thick rudder post and two
3/4&quot; control horns you will need a 2.5&quot; servo arm (1.25&quot; each
side of center) and the servo throw will only be equal to your rudder throw
(maybe about 30 degrees) which gives you poor mechanical advantage and poor use
of your servo.&nbsp; If you use a shorter servo arm and more servo throw the
cables will go slack.&nbsp; The round servo wheel is a compromise by offsetting
this slack tendency and letting you get more servo throw.&nbsp; It's not a perf
ect match but it can be very close.</span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Anyone
that can do the math on this and present a complete answer can get a
recommendation to advance from a shade tree aerodynamicist to an apprentice.</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>--Lance</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<div style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt'>

<div style='mso-element:para-border-div;border:none;border-left:solid black 1.5pt;
padding:0in 0in 0in 4.0pt;margin-left:40.2pt;margin-right:0in'>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>----- Original Message
----- </span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></p>

</div>

<div style='font-color:black'>

<p class=MsoNormal><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> <a href="mailto:jpavlick@idseng.com" title="jpavlick@idseng.com">John
Pavlick</a> </span></font><o:p></o:p></p>

</div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<div style='mso-element:para-border-div;border:none;border-left:solid black 1.5pt;
padding:0in 0in 0in 4.0pt;margin-left:40.2pt;margin-right:0in'>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>To:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> <a href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">General pattern discussion</a> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Sent:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> Friday, May 09, 2008 9:02 AM</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Subject:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> Re: [NSRCA-discussion] Rudder pull-pull</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Chris,</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>&nbsp;The only benefit
that I know of is that you don't have to deal with the Ackerman angle like you
do with arms / horns. The cable is always&nbsp;the same distance from
the&nbsp;hinge center&nbsp;no matter what the angle is.</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>John Pavlick<br>
<a href="http://www.idseng.com/">http://www.idseng.com</a></span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

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border:none;padding:0in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>----- Original Message
----- </span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></p>

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<p class=MsoNormal><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> <a href="mailto:cjm767driver@hotmail.com"
title="cjm767driver@hotmail.com">chris moon</a> </span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>To:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> <a href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Sent:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> Friday, May 09, 2008 9:13 AM</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Subject:</span></font></b><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'> [NSRCA-discussion] Rudder pull-pull</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>&nbsp;</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>Can someone explain the
benefits (real or otherwise) of the pull-pull <br>
wheel type rudder servo arm vs. a regular servo arm? Is there some real <br>
benefit, or is it bling?<br>
Thanks<br>
<br>
Chris<br>
<br>
<br>
</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><o:p></o:p></span></font></p>

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border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>Stay in touch when
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border:none;padding:0in'><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>_______________________________________________<br>
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