just finished my ultra stick 40 and one of the aileron servos is making a buzzing noise all the time is this anything to worry about?

I assume that it's not a digital servo. If it is digital then the buzz is normal. If it's not a digital servo then the buzz is not normal. First thing to do is disconnect the control surface and see if the buzzing stops. If it does stop then something in your control setup is putting pressure on the servo and forcing to try and stay centered, which is causing the buzz. Check all of the control setup for that servo and see if you can find out what it binding or putting pressure on the servo.

Ken

Yes. If it is a digital servo, it is probably something in the linkage causing a bind. They start to hum, sing, complain that they are under a load. If it is an analog, it may be a bind also, or a defective servo.

Disconnect the serov lead and feel the movement of the arm. Is it sticking or hard to move? Is it clicking as you move the arm. If yes, fix the servo or replace it.. Replace would be the best bet. For the cost of a $25 servo, it just isn't worth the cost of the whole plane, engine, and radio equipment.

Just like old food in your frig, when in doubt, throw it out.

Don

Before you go taking things apart...

Just tap the aileron up and down. If the buzzing stops, don't worry about it - the engines vibrations will do the same thing as your tapping does.

they are digital ds821 i am gonna check the linkage first thanks for the replies!

If they are digital servos then a small "buzz" or "hum" is normal and you really don't have anything to worry about.

Ken