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<div class=Section1>
<p class=MsoNormal><span class=EmailStyle24><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Jim you are absolutely right on with this advise. I've been surprised
with unequal travel more than once even though the pushrod to servo arm and pushrod
to hinge angles were both 90 degrees, especially on ailerons whey rotate on
different plains.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle24><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Bottom line is be prepared to change the servo arms during bench setup
or just tweak the TX settings, but I'm kind of old school and like to get as
close as I can adjusting the linkage first. <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle24><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>I've also noticed that changing aileron endpoint settings equal amounts
often results in unequal travel and I always use a deflection indicator.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle24><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Jim<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle24><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if !supportEmptyParas]> <![endif]><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> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>Woodward, Jim R (US SSA)<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, November 11, 2010
6:01 AM<br>
<b><span style='font-weight:bold'>To:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Control surface/linkage setup</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Instead
of setting the arm at 90 degrees then trying to work equal throws from there,
instead, set the servo arm position at the center of the control surface
travel. For instance, if you set the arm at 90 degrees, adjust your
pushrod to center the aileron control surface, then measure throws (like with a
Jerry Budd laser meter), you’ll find that the up and down throws probably do
not match. 90 degrees on the servo arm is just one variable in the
geometry of the setup.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Instead.
Set your ATV to 140% (or the max that will not bind the surface), then measure
up/down on the ailerons. Move up/down and take note. The Up travel
might be more than the Down travel (or pull direction has more throw than push
direction). This is because one direction is gaining mechanical advantage, and
one side is losing it. If you move the servo horn “ahead” in the
direction the gain was occurring and reset the pushrod length to center the
surface then measure again. You will find that the total throws are
closer together. Now that the “result” of the servo motion is equal, <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Work
this method until the throws are equal up/down and you will not have to use the
Left/Right ATV or differential settings to achieve equal throw. <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Jim
W.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in;border:none;mso-border-top-alt:solid #B5C4DF 1.0pt;
padding:0in;mso-padding-alt:3.0pt 0in 0in 0in'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'>
nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>J N Hiller<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, November 10, 2010
8:32 PM<br>
<b><span style='font-weight:bold'>To:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Control surface/linkage setup</span></font><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle22><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Be
careful selecting servo arms. A believe there are 3 different spline drives in
use. When selecting aftermarket arms get the ones specifically intended for the
servo brand you are using such as 'JR' or 'Futaba'. Someone did a really nice
write-up on this some months back but I don't remember where I dead it.<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle22><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Jim
Hiller <o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><span class=EmailStyle22><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.0in'><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>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>Michael Cohen<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, November 10, 2010
5:12 PM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA<br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion]
Control surface/linkage setup</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>I have a
question for the list about control surface/linkage setup. I
remember a K-factor article which mentioned making the servo arm is
as close to a perfect 90 degrees as possible at neutral. This is what
the little 1-2-3-4 on the stock plastic servo arms are for. You
simply rotate the arm until 90 degrees is achieved. However, with
aftermarket heavy duty plastic or metal arms, is there any other solution other
than sub-trim? I am concerned about the “stock” arms deflection under
load and like to use the aftermarket products, but on some servos on my
airplane, this leads to a lot of sub-trim, which is also
not preferable. Thoughts?</span></font><font size=2
color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black'><br>
<br>
</span></font><font color=black><span style='color:black'>Mike Cohen</span></font><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black'><br>
</span></font><font color=black><span style='color:black'>D4</span></font><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
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