RE: 8611 problem
 

Well, it's not a power problem, Paul brought his load tester over and the powerbox reads right at what it should be, going to change out the leads next and then servo's if needed.

RE: 8611 problem
 

Guy's,,,, Remember Digital servos are always trying to find neutral. When flying, the neutral is established with air flow top and bottom. If you simulate the airflow, just a gentle netural hold, all the noise will go away? WHMC

RE: 8611 problem
 

I wish it was that easy, but at neutral the servo's are fine and steady, it's during deflection that they're bouncing, and not just a little bit, but more like 1/4", that movement is way to much!

RE: 8611 problem
 

I have had similar problems with other JR servos when I used 5 cell packs. I use a lot of the 8611A. If you drop the voltage to under 6.0 I bet the problem will go away, at least that is what Horizon has advised me to do. they will only recommend up to 6 volts now. I use Lion on areulator set at 5.7 volts, large turbine aircraft, and the 8611A has plenty of power at that voltage.

RE: 8611 problem
 

Hey Scott,

What was found out very early on in the 8611 was that the top case was cracking where the bearing sits when the servo was used in extreme 3D applications. Flying them in jets, and other models has never been a problem.

The difference between the two is the new upper case which has enlarged bosses around the bearing holder, a newer motor with more torque, and a different amp to handle the upgraded motor. Either servo will work fine for us in the jet arena.

Hey Wex,

all of my experience tells me one of your flap linkages isn't delivering the best geometry and mechanical advantage. IF you adjust it will go away. On teh other hand, the nice thing about the 8611A is it is so robust it can handle the smaller items when we miss a bit and it will not be effected during operation if it bounces a bit when idle.

RE: 8611 problem
 

John, it does seem to do it more when I have a full charge in the batts', but again, it does stop if I just touch it. I know when deployed, the air is enough to stop any problems (proof is in the flying/landing of the plane..no problems). The linkage is adjusted fine...I just thought it funny that only one would do it.

Thanks for the advice though!

Wex

RE: 8611 problem
 

We measured the powerbox servo output voltage under a loaded condition (1 amp and up) and it is supplying 5.6 volts - nothing close to being over 6 volts. The problem seemed more to me like a weak signal issue not a voltage supply issue.

PaulD

RE: 8611 problem
 

HI BOLI ,I HAD THE THING ON ONE OF MY JET ,WHAT I FOUND WAS THE SERVO SHAFT SUPPORT WAS CRACK

RE: 8611 problem
 

Lowell,</p>

</p>

I am not saying the linkage isn't adjusted correctly, what I am saying is the mechanical advantage is such that there is a load on the servo when in the up position. It won't be an issue in flight..</p>

RE: 8611 problem
 

Thanks John. It really hasn't been a problem at all. Just a nuesance!!</p>

I appreciate the help.</p>

Lowell</p>

RE: 8611 problem
 

Hey John. I wish thetech help guysat Horizon would admit to the servos being ok on a freash charged 5 cell pack because, for at least a year, whenever I call with a servo issue, the reps consistently state that the servos should not be operated at over 6 volts, as per the info on the packaging. i use mostly 8611A.

RE: 8611 problem
 

Unfortunately our customer support only has what is written in front of them. And then we have to look at how they interpret it. The packaging states 6 volts, but as we all know a 6 volt pack comes off the charger at around 7.2 or so, and then drops to a pretty solid 6.4 - 6.6 depending on amount of current draw. Most of our customer support guys do not fly or operate the stuff like the rest of us. So all they have is what they read. It would be awesome to have a customer support team that flies all the time but this is just not the case.