Lowflyer281

Im pretty new when it comes to bulding and repairing, i bought my Funtana 90s used and it flys great but when i used the left alieron it kind of jumps up which really effects the flying. I made a video for you to see http://www.youtube.com/watch?v=8yvO3S2Oju0 Does anyone know what can cause this?

sensei

Try a new extension to the servo, it may be a feedback problem, I have seen this several times in the last 40 years or so.

Bob

zx32tt

My Feedback: (9)

You don't mention what brand/number the servo is, but my guess is that the potentiometer is worn or of poor resolution. A brand new Hextronic exhibits this exact same problem. Basically, the servo travel overshoots the input. Check all the connections, but my guess is that the servo has seen better days.

790

Best solution is to replace the servo.

That said, if you like to fix things and have the skills then repair it. Here's a good tut about servos:
http://www.rccrawler.com/forum/showthread.php?t=142369