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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'>Gray,<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What type and brand of servos were you
using? I’ve had oscillation problems when using JR digital servos and
noted it on range checking. I swapped out the JR servos with Airtronics
digitals and the problem went away.<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Did you by chance check the battery
performance on the Rx pack with a similar load that was being placed by the
servos? I would be curious what the discharge curve looked like after the crash
if the Rx pack survived, assuming there is data with a higher discharge rate
closer to the servo load…Looks like your planning on testing this…<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I had an instance with a FM Rx where the
plane just shot down to a 45 degree during a level flight path. I was told by
folks watching that I couldn’t have put that much stick in to make the
plane react like that. When I landed I found the antenna coiled up. After I
fixed that it did it again. I then switched to a PCM Rx with all Futaba digital
servo’s and never had another problem in that plane.<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It was also suggested that my crystal was
cracked or bad on that Rx. When Airtronics looked at it they could find
anything wrong with the Tx or Rx and replaced the crystal in the FM Rx anyway.
I’ve used that Rx in sport planes with no problems since.<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Perhaps Mark Atwood may chime in…<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’m not sponsored and I’m not
a Stylus expert, just curious. I fly the Stylus Tx and the PCM Rx.<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><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Larry
Diamond</span></font></st1:PersonName><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><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>
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<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>Gray E Fowler<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 02, 2008
9:25 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]
Ideas on radio beserkness-cause of crash??</span></font><o:p></o:p></p>
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12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>Hey Anthony</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Never
set up that warning function. Several people have indicated a low battery.
Lance thinks fractured crystal...10 years old, stored in my garage at 105F to
25F or so. Every battery failure I have seen (none were mine) the radio flat
out quit. Lance and I are going back out today, better equipped (long
pants-machetes!!!) If I find it I can re-test the battery..It tested about 150
MAH of its rated capacity, but I do not have the tester drain the crap out of
the volatge.</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Man
that plane flew good....9 lbs 15 oz...My skills are so deteriorated.</span></font>
<br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
</span></font><br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radomes and Specialty Apertures<br>
Technical Staff Composites Engineering<br>
Raytheon</span></font> <br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><b><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif;font-weight:bold'>Anthony Romano
<anthonyr105@hotmail.com></span></font></b><font size=1
face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'> </span></font><br>
<font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>Sent
by: nsrca-discussion-bounces@lists.nsrca.org</span></font> <o:p></o:p></p>
<p><font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:
sans-serif'>09/02/2008 09:18 AM</span></font> <o:p></o:p></p>
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<p class=MsoNormal align=center style='text-align:center'><font size=1
face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>Please
respond to<br>
<st1:PersonName w:st="on">General pattern discussion</st1:PersonName>
<nsrca-discussion@lists.nsrca.org></span></font><o:p></o:p></p>
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<p class=MsoNormal><st1:PersonName w:st="on"><font size=1 face=sans-serif><span
style='font-size:7.5pt;font-family:sans-serif'>General pattern discussion</span></font></st1:PersonName><font
size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>
<nsrca-discussion@lists.nsrca.org></span></font> <o:p></o:p></p>
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<p class=MsoNormal><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif'>Re: [NSRCA-discussion] Ideas on radio
beserkness-cause of crash??</span></font><o:p></o:p></p>
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<br>
</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Hi Gray,<br>
What a huge bummer. Did you have the low rx alarm function turned on? On the
Stylus that is a switchable function that will drop the throttle to alert you
to a low rx voltage. Now I am paranoid and have to go check mine.<br>
Have heard of similiar "brown out" type of behavior with a Nimh rx
battery failure. Hope you can recover the aircraft. This time of year the
growth in most places can swallow anything.<br>
Many solid flights for almost ten years on my Stylus but it is serviced every
winter.<br>
<br>
Anthony<br>
<br>
<br>
<br>
</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><br>
To: NSRCA-discussion@lists.nsrca.org<br>
From: gfowler@raytheon.com<br>
Date: Tue, 2 Sep 2008 08:30:17 -0500<br>
Subject: [NSRCA-discussion] Ideas on radio beserkness-cause of crash??<br>
<br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'><br>
Guys</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> <br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'><br>
Yesterday on my 4th flight of the day my PCM Stylus went nuts. PCM program was
set for idle throttle and about 5-6 clicks(trim wise) of up elevator-all other
surfaces neutral, and this was tested as such by turning off the transmitter. As
I passed by center I noticed that I could not gain altitude and the the
throttle started going from idle to high...then ailerons started oscillating
small left-right deflections. I cut the throttle to the kill position but the
engine persisted up-down bursts. I was able to do a 180 degree turn with
aileron coming back to center...never losing altitude, but unable to change the
altitude,elevator seemed unresponsive. As I passed by center again I was losing
more and more control. The plane flew over the wooded area south of the field
at about 200 feet high, I could not turn and the ailerons rolled the plane
upside down and it went straight down into the trees. This whole episode last
about 45 seconds. Cannot find the plane, and remnants of Gustav are headed my
way.</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> <br>
<br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'><br>
Plane was new had about 10 flights on it.</span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'><br>
New battery..NiMH 5 cell pack -no regulator (ran 5 cell packs for years, no
regulator) <br>
Reciever-1999 Stylus PCM-never crashed, wrapped in foam</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><font
size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
New switch</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font><font size=2 face=sans-serif><span
style='font-size:10.0pt;font-family:sans-serif'><br>
Transmitter-1999 Stylus, never been serviced, never had problems</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <br>
</span></font><b><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif;font-weight:bold'><br>
What would cause a PCM receiver to do such a thing?</span></font></b><font
size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>
If I had and intermittent signal, once the receiver did get a signal the only
two throttle signals should have been idle (PCM hold) and off (transmitter). I
am going to send the transmitter in just to get checked.</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'><br>
Thanks guys....<br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radomes and Specialty Apertures<br>
Technical Staff Composites Engineering<br>
Raytheon</span></font><o:p></o:p></p>
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