Motor glitching

[eckloss]

jOne thing I've noticed with my 72nd SSN 22 setup is that from time to time the motor/prop glitches. When I try to get forward thrust the motor sometimes spits and skips, and the rudder will jitter a bit.

Any ideas?

e.

[salmon]

Erich,
If I was to take a swing at guessing, I would first look to your ESC. Is there a setup process for that ESC? Can you swap it out? Also, as big as that monster is, are you making extra long runs to the servos or ESC?
If so, maybe a noise suppressor might be in order.
Peace,
tom

[crueby]

You do have capacitors from the motor leads to the motor can? Without that glitches are common. Otherwise, look for metal on metal rubbing somewhere, keep the ESC as far from the receiver as possible too.

Beyond that, keep the rum away from the crew...

[eckloss]

I don't know how A caused B, but I gave a slight amount of slack in the prop shaft (shortened the dog-bone ever so slightly), and that seems to have solved the problem. It's noisy as all hell when the motor runs, but it works. I think the motor was stressing too hard to turn the shaft and somehow caused the problem.

[salmon]

Good troubleshooting Erich.

[bigdave]

Sometimes I have found the glitching can come from the drive line.
Especially if it's metal on metal.
Metal U-joints will do this. But dog bones not so much. But it's possible.
I always run 3 caps on my motors as well.
One from each lead to the case, and one across the leads.
Some do only one or the other.
Glad you fixed the issue. BD

[crueby]

In the pictures on the other thread, it looks like you are using a brass or some other metal dog-bone, so having that rubbing on the metal fittings (dog teeth? whatever its called) could be the source of the interferance, and be why changing the tension on it matters. Changing to a nylon or other plastic core would help, as long as you pick a strong enough material.