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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jim W.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>J N
Hiller<br>
<b>Sent:</b> Wednesday, November 10, 2010 8:32 PM<br>
<b>To:</b> General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] Control surface/linkage setup<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span class=EmailStyle20><span style='font-size:10.0pt'>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></span></p>
<p class=MsoNormal><span class=EmailStyle20><span style='font-size:10.0pt'>Jim
Hiller <o:p></o:p></span></span></p>
<p class=MsoNormal><span class=EmailStyle20><span style='font-size:10.0pt'><o:p> </o:p></span></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:black'>-----Original Message-----<br>
<b>From:</b> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b>On Behalf Of </b>Michael
Cohen<br>
<b>Sent:</b> Wednesday, November 10, 2010 5:12 PM<br>
<b>To:</b> NSRCA<br>
<b>Subject:</b> [NSRCA-discussion] Control surface/linkage setup</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='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><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'><br>
<br>
</span><span style='color:black'>Mike Cohen</span><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:black'><br>
</span><span style='color:black'>D4</span><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p>
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