[voyager_663rd]

Fixed the servo travel problem.

Now to digital servos. I've only had one previously. The buzzing was something I was told was inherent in them and I was usually able to position the rudder to eliminate it.

However, my new plane has got digitals all round. The ones giving me the headaches are the ailerons.

It seems that just the force of the aileron at rest causes them to buzz. If I lift one up just ever so slightly (as a test) so that no pressure is on the servo arm, the buzz stops.

Sounds like a symphony of mosquitoes. Loud ones at that.

I'm using 2700mah batteries so I'm not concerned about drainage for how little time I'd be in the air but I would like to fix this if possible.

Ideas?

[Oilsands]

The weight of the ailerons and the servo trying to hold the weight is what is causing the buzzing. If they are HiTec servos and you have a programer you can change the pulse width (I think that is the one you need to adjust). Better yet, is to adjust the linkages to give the best mechanical advantage possible for the throws you need, before using the programmer or radio end points to adjust the throws. I fly IMAC so I do not need very much throw, thus I can have fairly short servo arms and adjust the control arm length to give me the throw I need. It may not stop the buzzing completely, but it will reduce it for sure.

[Angus]

Yes get used to it, I tried to work out this very issue this morning with my flaps, tweak the trim just a little and it goes away until I drop the flaps a few times and it is back, ailerons too, flip the stick a bit and it goes away, flip them again and it is back.

The is no doubt that they will buzz very loudly if they are binding or even if the control surface is a slightly tight to move, they are fighting to center themselves that ever so tiny bit.

the weight of the surface will do it too as you discovered

The current draw on a buzzing servo that is not dealing with abnormal load or friction is very little to don't worry about it.

I, just like you find that it drives me crazy

Angus

[RAMJET]

(buzzing)I find with the high res (7955) servo and a 2048 radio ,it's not as bad as the 1024 stuff with the 5955 servos .its a real problem with 7955 and 1024 radio or when the servo has better resolution than the radio(some guys are converting there radio to 2.4 and not getting full 2048 resolution then use a 7955) .remember not all components work well together.you will always get some buzzing even with the best matched setup but try to match things up as mutch as possible.Roger

[Oilsands]

Thanks Angus, forgot to include the binding or tight pivot points.
Thanks for the info Ramjet (roger), did not know that.

[voyager_663rd]

I thought that binding at rest might have been an issue but there is none. The arm is free to move (in fact, there is a bit of slop in the mechanical connection itself which I have no concerns about at all (not on the servo spindle--that's tight.)

Oh well, glad to see I don't have a unique problem. At least I can't hear it once the engine starts up

Thanks folks.

[Oilsands]

It is not so much the linkages binding, but the pivot points may be tight which make the surface not as free to move thus putting a little back pressure on the servo which holds it a bit off center (keeping it from centering) thus causing the buzzing. Just disconnect the linkage and check the suface movement. Usually not much you can do with the pivot points (hinges).