Servo chatter

[sf2]

???hi folks ,I did ask this on rc groups, but thought I'd getter more info here.My servo's in a wing when both TX and Rx are turned on, tend to constanly flicker, chatter, They do seem to work ok tho, but always wether in neutral or over at some pitch, they chatter. They are a couple of GWS BB MG servo's. I have tried some hitecs I have in another plane which all went well so I guess the Tx is ok. I've checked the the battery pack, but am charging another for a second "opinion".
Rc groups suggested a clean of the contacts inside the servo, but they are glued into the wing(just being lazy) thought I'd see if any one had any ideas before I attempt removal and cleaning.

[skyboyken]

Frankly my best suggestion is to spend up on servos. EVERY 'cheap' servo I have ever bought went in the rubbish. Every quality servo I ever bought I still have or was sold in the plane and AFAIK is still giving good service. By 'cheap' I mean 'I chose not to buy the servo I knew would do the job properly and instead bought something cheaper hoping it would do the job'. I finally learned my lesson but it took a while and it was expensive.

Having had my rant now, a practical suggestion would be to check that your hinges are free (disconnect the servo at the control horn and see if the hinges have any restriction at all in their movement) and also check to ensure that each linkage has no binding anywhere in its movement range.

The reason for the chatter is that the servo can't get precisely to the position you have commanded it to move to. If it could, then it would stop trying and the chatter would stop. The 3 main reasons for this behaviour are:

1. Binding in the hinges or control linkages,

2. Slop in the servo gears, and/or

3. Slop or dirt in the servo potentiometer.

Once you have checked the hinges and linkages and corrected any problems if there are any, then the chatter should stop. If it doesn't the only option is to replace the servo with a better one.

Good luck, and Go Great!

Ken.

[thevon]

I haven't been too fussed with the GWS. I've had those same ones and I hate the amount of slop.

One commonly reported cause of chatter is electrical interference from your aerial wire crossing over other wires, or power wire, or something. Seems to mostly not cause problems, but sometimes just rearranging the layout of the wiring in your Rx bay can fix it. Also if your aerial wire crosses a servo wire, it needs to do so at right angles, not run alongside it where it can pick up interference.

Best way to isolate whether it's the servo is to disconnect the wiring from your current RX totally, grab another RX and leave its aerial hanging nice and long, plug those servo connectors into the new RX and power it up and see if it chatters.

Also (long shot) I'm not sure if you've flown this thing yet, but make sure you try it outside. Sometimes in a shed, or near electrical appliances you can get interference and when you take it outside it's clean.

[ezza]

I have used those servos and they are the loudest/chattiest on the market. They make all kinds of noise, all the time, wait till you do a close in flyby.

These servos are strong. I have only ever broken the servo arms. They have alot of power for their size but do have a little slop from new. Fine in most foamies. You do get what you pay for though. They tend to burn out(stop working) after 50 hrs or so of flying. Now that they are in the wing you may as well just go with them.

If/when you decide to upgrade, the JR 362 are exactly the same size in length and hieght, and a touch thinner, so you can snap a couple of those in. This what I did with my old Reaper.

Eric

[felix]

im using gws park servo's in my bee and never had a prob yet even after alot of airtime n abuse at SC.noisy for sure but seem to be reliable.....have had chatter before in a fling and electra and was solved by rerouted the aerial.

[ding]

I agree with everything that has been said here.

I've been using JR servos pretty much since the beginning. In the pattern models they were getting very expensive, but they had a job to do. For the record, the only jr servo I've ever had fail was a 4131 which was a $150 servo

The thing is all servos are different, and all of them are best suited for one application. I used to have 8+kg servos on rudder, 4kg micros on elevators, and digital servos on ailerons... and something small and light on throttle...

One thing that is new to me is that in sloping the strength of the gear train is much more important than in power. In power 1 crash and usually the plane is a write off. If you kill a couple of gears... thats the least of your problems. However with these foamies it's routine for them to take monsterous hits every day. If they are easily broken then it's a right PITA. I found at SC the standard JR's that have always served me well just kept breaking gear trains. So, I put the cheapest of cheap futabas in and I've only done one GT since. I think the jr's were faster, more accurate, used less power, but they weren't the right servo for the job!!

[atmosteve]

Its true, we often get what we pay for, though my newish gws MG2BB mini servos make a racket, they dont chatter at all with JR radio gear. Slop is comparable to base line JR/Futaba/hitec makes but in their case thats not critical in application. I wouldnt put them in an expensive or very fast model, but for knockabout frontside foamies they should be ok, though they do seem to draw a bit of power.. yep.

In fact just mucking with them now, I havent been able to make them misbehave by experimenting with the Rx antenna or batt pack posi in relation to them, unless i do something silly with the rx anrenna wire.

Hope that they come good with some process of problem elimination sf2, but being glued in, old Murphy might have bets on you pulling them out..

[sf2]

Well having a futaba set I guess the JR is out the window(yeh I know futaba in Australia, but I brought it in from the UK when I came). I have Completely drained My battery and recharged, seems to have helped. But as the servo wire tuns out of the L.E of wing into Rx bay it's going to be difficult passing the aerial pass (?)them at 90degrees, it is a few cm below on the side of the fuse.I guess I'll just keep using them and when they pass on hopefully I won't be to far out on the hill or in some dive.
Just don't want to take them out really.But thanks for all the info.
Cheers

[RichardToult]

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