<HTML><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><meta content="MSHTML 6.00.6000.16674" name="GENERATOR"></head><body bgcolor="#ffffff"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; FONT-WEIGHT:Normal;">I don't know. Unless they are mini servos, i''d doubt it.<br>Jon </span><br><br><hr><span style="font-size:10pt;font-family:Tahoma; font-weight:bold">From: </span><span style="font-size:10pt;font-family:Tahoma; font-weight:normal;">bill thompson <billt2@verizon.net></span><br><span style="font-size:10pt;font-family:Tahoma; font-weight:bold">Sent: </span><span style="font-size:10pt;font-family:Tahoma; font-weight:normal;">Saturday, July 05, 2008 4:26 PM</span><br><span style="font-size:10pt;font-family:Tahoma; font-weight:bold">To: </span><span style="font-size:10pt;font-family:Tahoma; font-weight:normal;">General pattern discussion <nsrca-discussion@lists.nsrca.org></span><br><span style="font-size:10pt;font-family:Tahoma; font-weight:bold">Subject: </span><span style="font-size:10pt;font-family:Tahoma; font-weight:normal;">Re: [NSRCA-discussion] Servo question</span><br><br><div><font face="Arial" size="2">Jon</font></div><div><font face="Arial" size="2">I have some #4721 & #4131 are the pots adjusted the same as the #3421's?</font></div><div><font face="Arial" size="2">Bill T.</font></div><blockquote style="border-left-color:#000000;border-left-color:auto;border-left-style:solid;border-left-width:2px;margin-left:1px;margin-right:0px;padding-left:5px;padding-right:0px"><div style="FONT: 10pt arial">----- Original Message -----</div><div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><b>From:</b> <a title="jonlowe@aol.com" href="mailto:jonlowe@aol.com">Jon Lowe</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-discussion@lists.nsrca.org</a></div><div style="FONT: 10pt arial"><b>Sent:</b> Saturday, July 05, 2008 2:55 PM</div><div style="FONT: 10pt arial"><b>Subject:</b> Re: [NSRCA-discussion] Servo question</div><div><br></div><div><font face="Arial, Helvetica, sans-serif">3421's have the pot shaft driven directly by the output shaft. If you reach down thru the hole for the servo arm screw with a jewelers screwdriver, there is a slot that can be used to adjust centering of the pot which is a press fit into the gear. The pot shaft may have slipped in the output gear. Pot shaft could be binding, or the output gear may be cracked internally allowing the shaft to slip. You could just need a new output gear. I'd try adjusting it to see how easy it slips. A VERY small movement of the pot shaft will affect centering in a BIG way, so be careful. Perhaps, the pot may also be coming apart or wearing badly internally, affecting centering. Definitely determine the cause or send it back to have at least the pot replaced, along with the gears.<br><br>Years ago, many servo pots were driven like this, and didn't caouse a problem except for servo pot wear. Replacing pots after 25 flights was not all that uncommon. Most (all) larger servo pots anymore are indirect drive to help prevent pot wear. 3421 is probably just too small to do an indirect drive.<br></font></div><div><br></div><div id="sig7585" style="CLEAR: both"><font size="+0">Jon Lowe</font></div><div><br></div><div><br></div>-----Original Message-----<br>From: chris moon <cjm767driver@hotmail.com><br>To: nsrca-discussion@lists.nsrca.org<br>Sent: Sat, 5 Jul 2008 12:47 pm<br>Subject: [NSRCA-discussion] Servo question<br><br><div id="AOLMsgPart_3_6d6b51bf-7e60-404a-b7ed-ead326f954d9"><style>#AOLMsgPart_3_6d6b51bf-7e60-404a-b7ed-ead326f954d9 .hmmessage P {
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</style> Ok, here is a brain teaser for you experts.<br><br>On Sunday 2 weeks ago I went out flying maybe 4-5 flights. All was<br>fine. When I got to the flying site on Friday for the Lake City<br>contest, I made a practice flight and the plane was climbing like mad.<br>I got it down and found that 1 of the elevator halves was about 3/8" up<br>from the other. Before the flight, I checked the operation of the<br>elevators and they were moving correctly but I don't remember<br>specifically if I paid any attention to if they were centered<br>perfectly. Now, nothing was changed between the the last time I flew<br>and this flight. The transmitter was on the right model. The linkage<br>had not slipped, nor had the control horn bent. The control surface<br>showed no sign of trauma from a severe bump possibly causing a stripped<br>gear. The servo (JR 3421sa) was functioning 100% normally it was just<br>the center had changed on it's own. I removed the servo arm (alum - not<br>stripped either) and moved it one spline and adjusted the sub trim<br>slightly and flew a few test flights and the contest with no problems.<br>Now at home, I removed the servo to send it back and inspected it and<br>found nothing abnormal. The gears all look fine. Here is what I have<br>eliminated:<br><br>servo arm - not stripped<br>servo gears - not stripped<br>pushrod and linkage - no play and not slipped on the clevis threads<br>transmitter - correct model selected and could not be elevator pot in<br>transmitter since it did not affect the other elevator servo's centering<br><br>I am sending it back for a check up but just was wondering if anyone has<br>had any similar experience ever or if they have any possible causes.<br><br>Thanks<br><br>Chris<br><br><br><br><br><br><hr>Making the world a better place one message at a time. <a href="http://www.imtalkathon.com/?source=EML_WLH_Talkathon_BetterPlace" target="_blank">Check out the i'm Talkathon.</a>=</div><div id="AOLMsgPart_4_6d6b51bf-7e60-404a-b7ed-ead326f954d9" style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: rgb(0,0,0); FONT-FAMILY: Tahoma,Verdana,Arial,Sans-Serif; BACKGROUND-COLOR: rgb(255,255,255)"><pre style="FONT-SIZE: 9pt"><tt>_______________________________________________<br>
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