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Servo "Buzzing"

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Old 03-12-2002, 04:58 AM
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Old Dutch
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Default Servo "Buzzing"

In setting up flaps, I find that I cannot get rid of a slight buzzing in one servo, while it is in the neutral position. On this servo I have a servo reverser. I have adjusted the pot on the reverser to get equal throws. I have ruled out noise, and the TX pot should not be the problem, as I get the same results with 2 new TX;s. That leaves me to believe that the linkage adjustment is the culprit. But when I work with the linkage adjustmet, trying to relieve what must be tension, I screw up the equal throw of both flaps. All is now working but I have this buzz. Not real loud but it is there. Not to worry? Should I just leave it as is and fly? I am concerned that the buzzing indicates stress on the servo, which could cause it to fail. Can someone please help me with this???Thank you in advance for you consideration.
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Old 03-12-2002, 09:46 AM
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bob_nj
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Default Fromm what you describe

it sounds like you can just forget about it and go fly. What kind of servo is it, and does the linkage move freely when disconnected from the servo? Some servos do hum as they hunt for and keep their neutral positions_Bob
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Old 03-12-2002, 02:04 PM
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Default Servo "Buzzing"

Thanks for your input Bob. The servo is a new Hitech BB. I also had a Futaba in there, same results. The pushrod is only about 4" long, and a straight shot, no binding, etc. One thing that I did not previously mention, is that when I shut off the switch to the RX this particular flap drops about 1/2 inch. I relate this to the fact that I have used the pot on the reverser to center it, and when I shut off the power, it returns to the actual servo neutral. If this doesn't make sense, it's only because this is over my head. I've built a dozen models, but this is my first one with flaps. It is a 1/5 scale Cessna Skylane that I have put a lot of money and close to 400 hrs. of fun (hard work) into. Sure don't want to see it dump because of this one little glitch. Guess I may be over reacting to the buzz . I just thought of another thing. I can use the sub-trim function on my TX to relieve the buzz, but then my flaps are not positioned where they should be. So, no doubt the problem is directly related to the link adjustment. For now, I'm not going to do anything further with it. The servo holds the flap firmly in both up and down positions. Thanks for your help.
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