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Servo jitter

So I just build my 2nd mini arrow. I flew it today for first time it flies like a dream even better then my first version however I noticed while checking my craft that when I accelerated the throttle past 50% my left servo would shake and end up at full up deflection is this just a bad servo or could something else be wrong


Legendary member
Hard to tell from the picture. I could not see any control rods or control horns.
Are you saying the servo goes full up while bench testing?