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Aileron Servo Issue-Head Scratcher

Old 08-18-2011, 05:18 PM
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Default Aileron Servo Issue-Head Scratcher

My Ikon Monocoupe D145 is about 10 years old and flies well. I hadn't flown it since last season, and when checking it out, I found a small aileron servo reversal / bounce on one side. Since I know little, I tried changing Y harness, thinking maybe the connections were bad. Improved it a bit, but not enough. So I changed out the JR servo with a cheap Tower Pro, since that's all I had. Bounce and reversal were gone. I share the transmitter with other models and had to do a servo reverse. That brought an un-commanded full stroke of both aileron servos. What's going on? I replaced the receiver and saw [8D]no change. Then I switched transmitters with another identical JR and the problem was gone. I was ready to go. Except both ailerons went up together and down together. Did I have the radio set for flapperons or something? No. It appears the JR and Tower Pro servos rotate in opposite directions for the same input command. My fix was to flip the servo plate around so the arm was on the inboard side and moved the control horn. It works.

What did I learn? Don't use junk. Use a matched pair of servos. Don't arbitrairly change the receiver when the problem showed up on the transmitter.
Old 08-19-2011, 06:07 AM
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Default RE: Aileron Servo Issue-Head Scratcher

Feedback potentiometers inside the servo, that tell the location of the control arm, to the electronics get dirty (oxidize) without use. The wiping action, as you use them cleans off the oxidation, and everyone is happy again.


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