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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Can’t you determine if it is a radio
problem by switching the servos & channels?<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> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----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>Bob Richards<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, August 11, 2006 6:31
AM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Twin elevator servo issue using Futaba 9 ZAP</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Brian,<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>I think there are two problems. 1) Movement commands
from the radio arriving at the servos at the same time (dynamic) and 2) Control
surface throws matching through the entire range (static).<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>What you are describing is a dynamic problem, ie: does
the radio do all the mixing and send the information to the servos *at the same
time*. In other words, while the servos are moving, one is lagging behind
the other since the radio is processing one channel before the other. Also
adding to the dynamic problem are the speeds of the servos, they must be the
same.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>The other problem is what I was talking about, when
the servos stop, are the control surfaces tracking together. This depends on
the linkage geometry as well as the servos being linear.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>A matchbox attempts to correct both problems. However,
a matchbox only matches 3 points in the entire travel range, and the problem
described (as I understood it) is that the throws don't match halfway between
the neutral and endpoints. It would be nice if there were multiple points
in the range (5, or 7) that could be programmed in the matchbox. This feature
could even be used to program in expo, seperate from the transmitter.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Servos can have linearity problems due to the
manufacturing tolerances of the feedback potentiometers. I have seen pots (not
from servos) that were "adjusted" by milling away material around the
perimeter of the conductive material, but I wonder if anyone does this for the
small servo pots used in our systems.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>IMHO, the processing speed is not as much of a problem
for us, at least in pattern, as we might think it is. It is much more important
that the surfaces end up at the same position, since that will affect the
flight more than the small difference in position *while the surfaces are
moving*.<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Bob R.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>brian young
<brian_w_young@yahoo.com></span></i></b> wrote:<o:p></o:p></span></font></p>
</div>
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margin-left:3.0pt;margin-top:5.0pt;margin-bottom:5.0pt'>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>I think this is a problem with the processing
capability of the TX. You have a progammed mix, it reads one channel then the
next. I had a 9CAP where this problem was very noticable. Now on my 9Z its not
as noticable, it looks like the slave servo is a little slow to catch up. Only
real solution in my opinion is a match box, y-cable or similar device.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>I can sit back and pick which servo is the slaved just
watching the surfaces. <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Im understanding that your endpoints match when the
surface are finished moving, and the middle is matched as well. You should be
able to stop at any point in the travel and the pointers line up, when they
stop moving. If this is the case your linkage would be ok. <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>I think the speed of the servos has passed the
processing speed of the radio.<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>Bob Richards
<bob@toprudder.com></span></i></b> wrote:<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>That might be the cause, or it could simply be a
difference in linearity between the servos.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Bob R.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
<o:p></o:p></span></font></p>
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