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<DIV><FONT face=Arial size=2>The only servo that was old was the throttle servo
and I changed that and I forgot to mention that on one of those corrective
actions I changed the switch also. Yeah, I think the Saito probably does vibrate
more than the O.S. I feel that the connection to the battery is solid
because I charge on the way to the field bouncing along in the car and if there
was an intermittent in that line the E drop would kick out my charger and
that has never happened through many cycles, but thanks for the feedback
guys.</FONT></DIV>
<DIV><FONT face=Arial size=2>G.</FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 07, 2006 4:57
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] RF
Interference</DIV>
<DIV><BR></DIV>
<DIV>It can't be the receiver, you replaced that.</DIV>
<DIV>I seriously doubt it is the landing gear, and it probably isn't
metal-to-metal noise, since you had glitching while handling the
antenna/rx.</DIV>
<DIV> </DIV>
<DIV>Vibration induced.</DIV>
<DIV>Handling the RX caused problems.</DIV>
<DIV>Changing the RX made the problem go away for a few flights.</DIV>
<DIV> </DIV>
<DIV>I suspect you have a faulty connector to the RX, possibly a servo
connector, but more likely the battery/switch harness. When you plugged
in a new RX, you disturbed the bad connection enough to possibly make it a
good connection until more vibration caused it to go faulty again.
Coincidental to the engine/gear replacement, or possibly the wiring was
disturbed during this change, or the Saito may vibrate more than the OS.</DIV>
<DIV> </DIV>
<DIV>Just my 2CW.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>"george w. kennie" <geobet@gis.net></I></B>
wrote:</DIV>
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<DIV><FONT face=Arial size=2>Hey Guys,</FONT></DIV>
<DIV><FONT face=Arial size=2>Looking for some input here regarding RF
interference. </FONT></DIV>
<DIV><FONT face=Arial size=2>I lost Javelin number 3 this morning which I
had been having glitching problems with for over a month. </FONT></DIV>
<DIV><FONT face=Arial size=2>Originally I had been flying the plane with an
OS-70 surpass II , but when the motor lost performance I decided to go for a
little more oomph and installed a Saito 91 which was actually 2 oz. lighter.
The Saito drove me nuts 'til I finally figured out the Low speed needle
and then I became very satisfied with the extra performance. The next
performance improvement I decided on was to replace the wing mounted gear
which was prone to bending even on greasy landings, so I picked up a set of
carbon-fiber gear (one piece) and bolted the unit to the bottom of the fuse
just ahead of the wing which solved all the ground handling problems and
also gave extra prop clearance. Now these two mods were executed about the
same time and subsequently I started to experience glitching problems. When
it first manifested itself it was in the nature of the throttle servo
pulsing intermettently on the ground during warm-up and then it would smooth
out and I would take off and fly and it would seem O.K. Feeling
uncomfortable with this condition I decided that I must have some metal to
metal contact somewhere. Due to the fact that the 91 shaft was longer than
the 70 I was forced to push the engine back all the way in the engine mount
and I thought the carb might be contacting one of the bolt heads holding the
mount to the firewall. Well, I corrected that problem only to find at my
next outing that I still had Intermittent throttle pulsing. Back to the
drawing board, I next decided that the receiver was suspect as it had been
through a previous incident, so I installed a different receiver. Next
time out the plane flew like a charm and I had about 4 outings with no
glitches and then on my 5th outing I got a resumption of the throttle
pulsing ( actually, all servos were jittering, but the throttle audibly let
you know it). I actually flew some flights like this and would experience
serious glitches on the same maneuver in the same position within the
maneuver repeatedly. It also seemed to be vibration related as I found
that when I shut off the motor in flight the glitching would cease.
Then I decided that the wiper on the throttle servo might
be bouncing on the surface of the resistive element and giving me
spurious signals within the system, so I decided to change out the throttle
servo. In the process of disconnecting the throttle servo from the receiver
I had inadvertently left the receiver ON and when I lifted the
receiver things started jittering,.......aha, pulling on the antenna wire
was giving me spastics ! O.K., got ya, ya buggar! Spun out to
the LHS and picked up a new antenna and figure VOILA home free ( with a
little knawing feeling of wonder about why did the first receiver do the
same thing? Do I have two receivers with broken antennas, after all I
have strain reliefs on these things hmmmmm ???) </FONT></DIV>
<DIV><FONT face=Arial size=2>Well I show up at the field today with the new
throttle servo and new antenna and start the engine which purrs like a
kitten with no pulsing. GOTCHA ! Taxi out to the center of the runway,
switch to low rates and feed it the oysters. Beautiful long low gradual
climb out to 5 ft wherupon the right wing goes to KE position (L to R
take-off), I slam in full left aileron and left rudder and it didn't budge
as the nose came down and the right wing made contact with terra firma
Pogoing the thing to oblivion.</FONT></DIV>
<DIV><FONT face=Arial size=2>I had to go get petrol, and as I'm driving I'm
doing the Sherlock thing, thinking, the only thing I changed is the motor
and then It hit me! Holy Smoke, I put carbon fiber gear on that buggar.Could
I be getting some kind of reflections from that thing to the antenna?? After
all, The symptoms are identical to the symptoms that occurred when the
antenna was broken.</FONT></DIV>
<DIV><FONT face=Arial size=2>So you can see what my question is here. Has
anyone experienced any kind of interference caused by using carbon fiber
gear? I remember some of the guys with carbon reinforced fuses talked about
how they had to run the antenna outside of the fuse. Also the Javelin has
that chrome monokote under the transparent blue and I've heard about
that causing potential interference, but I have had two previous Javelins
with the antenna run the same way ( on the outside of the bottom of the
fuse) With no interference problems and many many flights.</FONT></DIV>
<DIV><FONT face=Arial size=2>What ch'all think? Ed Alt? Any of
you electronic gurus?</FONT></DIV>
<DIV><FONT face=Arial
size=2>Georgie</FONT> </DIV>_______________________________________________<BR>NSRCA-discussion
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