Strange servo issue

[DukeMinnix]

Servo in question Savox 1230sg

Symptoms: Chattering back and forth quite noticeably at idle. Steers smoothly left and right, returns to center, and continues to chatter left to right. Like a seizure and continues. Under throttle is cuts back the further you go into the throttle curve until at about half to 3/4 throttle the problem goes away.

Mamba Max Pro with external BEC. 2s batteries. Roc412. Also had the same issue when running the stock esc with external bec and 55t brushed motor.

Now here is the funny thing, the part I can not understand. It ONLY does it when I'm running the vanquish method 105s with Rock beast II and CI foam. When I'm running the proline beadlocks with TSL and memory foams, the problem doesn't show at all.

Anyone have ANY clue as to why it would do this and only while using the one wheel and tire combo and not the other?

[Meatwad]

Try taking alot of stuff out of the equation. Wheels/tires off (yeah that's a weird one) and esc unplugged from rx.

If it's still acting up I'd lean towards servo being the problem.

[mikemcE]

Issue is most likely caused by good grip and the servo .
I noticed I had issues with my servo until I went way up . My ruptures and CI foams are great gripping, but really tax the servo .
I'm surprised that would be an issue if your at 6v though.
I did finally give up on Savox due to the chatter and centering


Hang up and Drive

[DukeMinnix]

Originally Posted by Meatwad

Try taking alot of stuff out of the equation. Wheels/tires off (yeah that's a weird one) and esc unplugged from rx.

If it's still acting up I'd lean towards servo being the problem.

as I said, problem only exists with the one set of wheels and tires, when the proline beadlocks and proline tires are installed in place of the vanquish methods and rock beasts, the problem quits.

Originally Posted by mikemcE

Issue is most likely caused by good grip and the servo .
I noticed I had issues with my servo until I went way up . My ruptures and CI foams are great gripping, but really tax the servo .
I'm surprised that would be an issue if your at 6v though.
I did finally give up on Savox due to the chatter and centering


Hang up and Drive

I could see grip being the problem, but it happens after the servo is back at center, not during strong turning or turning at all.

[Meatwad]

Originally Posted by DukeMinnix

as I said, problem only exists with the one set of wheels and tires, when the proline beadlocks and proline tires are installed in place of the vanquish methods and rock beasts, the problem quits.

Rb's on and truck off the ground? Savox are known to be noisy, mine cry all the time

[DukeMinnix]

Originally Posted by Meatwad

Rb's on and truck off the ground? Savox are known to be noisy, mine cry all the time

does it being suspended in the air also. It is noisy regardless of wheel combo, but only does the left to right shuttering with the one.

[Ninomaniac]

Are the tires jelly-like enough to cause the effect? My guess: servo centers, inertia of tires wants to keep steering, servo corrects the overshoot, swings tires a bit back = everything oscillates briefly.

On the other hand, I could be full of crap.

[DukeMinnix]

Originally Posted by Ninomaniac

Are the tires jelly-like enough to cause the effect? My guess: servo centers, inertia of tires wants to keep steering, servo corrects the overshoot, swings tires a bit back = everything oscillates briefly.

On the other hand, I could be full of crap.

negative. filled with crawler innovations single stage tall designed for RBIIs

[mikemcE]

Weight difference between them ?


Hang up and Drive

[DukeMinnix]

I'll have to check, but the front of the prolines are weighted and none of the methods are. taking the larger size and foam into account, I'd say theyre actually about the same, the proline setup may actually be a little heavier

[DukeMinnix]

so its been a slow day at the dealership, and I've done not much besides fool around on the internet, and I ran across this video on youtube. It's of a jittering servo on aircraft and the fix. Basically the guys theory is that the flap weight is providing just enough force again the servo that when moved, it attempts to find center and overcompensates because of gravity/weight of the flap and continues to jitter. He solved this by added a small spec of sticky back foam in between the flap and wing surface and creating just a bit of resistance. Now, I think something similar may be my issue, but I don't have weight pulling on the servo to blame. My servo is having no force put against it at rest. Any theory or possible fix any of you inquiring minds can imagine?

https://www.youtube.com/watch?v=GNI7TaK5POc

[mikemcE]

My Savox servo would twitch and shake when on. I had an issue on my BLE and sent it into Holmes. Long story made short, my castle external bec found a different neutral point, I wonder if that is your issue also. Here's a note from HH about it:



Hang up and Drive

[DukeMinnix]

So long story short, I need to do away with the external BEC

[DukeMinnix]

If this is the case, why does it jitter with only the one set of wheels and tires? That's the part I can't seem to figure out. It's almost like I have some sort of electrical interference or something

[DukeMinnix]

Well, I put the wheel combo giving me issues up for sale, they sold quick. So I guess I'll start over with a different second wheel and tire combo and hope for the best. If I have the issue again, I'll pop the servo off and throw a different on.

If anyone has had a similar issue and has a possible fix to try, I'm still all ears. Local guy bought the wheel combo so I'll have them another few days until he takes possession.

[DrewHammer]

You seem to have done a pretty good job convincing yourself that it's the wheels/tires when this is not the case.

If you're running an internal BEC from the ESC and an external I'd start by removing the power wire from the ESC plug and running strictly on the external BEC.

I'd be willing to bet there's something wrong with the servo, probably a feedback potentiometer that's starting to go bad. The new wheel/tire combo didn't cause it, it just exposed it.

[DukeMinnix]

Originally Posted by DrewHammer

You seem to have done a pretty good job convincing yourself that it's the wheels/tires when this is not the case.

If you're running an internal BEC from the ESC and an external I'd start by removing the power wire from the ESC plug and running strictly on the external BEC.

I'd be willing to bet there's something wrong with the servo, probably a feedback potentiometer that's starting to go bad. The new wheel/tire combo didn't cause it, it just exposed it.

internal BEC was eliminated

You may be right about the servo, just found it odd that the problem only happened with the one particular set of wheel and tire combo.

[mikemcE]

Weight and offset of the wheels is slightly different, the servo has issues centering, which is Savox quo.....


Hang up and Drive

[DukeMinnix]

Originally Posted by mikemcE

Weight and offset of the wheels is slightly different, the servo has issues centering, which is Savox quo.....


Hang up and Drive

That's where I'm leaning also. Just like the wing needed some interference in the video I posted, I think the softer memory foam with weighted wheels is giving that resistance, where as the stiff CI foam and unweights VPs are not

[hillclimber]

Is that sc-1230sg waterproof?
Can't fond a clear answer any where

Sent from my SM-G930T using Tapatalk