Stuttering Motor

[BalmyBaldwin]

Recently I have noticed a tendency for my Rc's to stutter when I throw them to full power. Unfortunately this doesn't seem limited to any particular car or any particular motor... Although the car behaves fine when accellerating slowly, if I go straight to full power, the car stutters as it gets there. Any Ideas what could be casuing this? I havn't had any mishaps with the ESC yet (e.g. water) so I'm hoping its not that!

For Info:

Cars with problem: 306 Maxi, TL01, Avante, F201

Motors (inorder of cars) Dynatech 02H, Dynatech 02H, P2K2, black can

ESC: Super Rooster

I always swap around my ESC and RX between cars.

[bholio]

Its either the transmitter, receiver, ESC, battery, motor or car drivetrain. As you've switched motors and drivetrains, it must be in the other electronics. Try switching one at a time if you can and isolate the problem. It sucks, but thats the best way, assuming you have additional electronics to try.

[Top Force Racer]

Here are a few recommendations:

1) Make shure you have the appropriate capacitors and/or Shotky diodes installed on your motor.

2) Make sure your motor brushes are in good condition and your commutator isn't black and/or pitted.

3) Try usinging a receiver pack instead of the BEC.

4) It's possible that either or both your TX and RX crystals are damaged. Try using another set.

5) Try moving your receiver and ESC as far away from your motor as possible.

6) Make sure all connections are in good shape.

I'd also try another radio system in there and if that doesn't work, try another ESC.

[WillyChang]

What battery are you using? If your 7.2V pack has skinny wires or

some high resistance spot along its plugs/circuit, the voltage drop

on full-power could be enough to starve the RX or ESC.

Novak's BEC should be very meaty & have good radio priority, so

that should not cause any problems unless its just your particular

example with an odd fault - unlikely imho.

[mud4fun]

I agree with WillyChang, the super rooster is more than capable of handling massive power and providing error free BEC too. I also found that by making sure the motor brushes were properly bedded in, soldering on new better quality motor leads (I cut down some of the super rooster motor leads which were very long anyway!), using 100amp solid brass (solder on) bullet connectors to the motor leads and making sure the 3 capacitors were fitted as per novaks instructions all stuttering vanished. I am now running a 14x2 via a super rooster using 8.4 volts and I have no problems (now I got my timing issue sorted as well), acceleration is smooth and the ESC delivers max power without problem. I use a futaba 40Mhz receiver.

[Top Force Racer]

Novaks are known for their quality ESCs, yes I agree. However, they are not immune to damage. If a separate RX pack solves the problem, then there's a good chance that the ESC is the culprit.

[BalmyBaldwin]

Cheers for that guys, I will now start trying to eliminate things...

My main problem is it seems to be a little intermitent so this could take a while...[}]

The main question is why this is happening now, as I didn't have this problem until recently[?]

[WillyChang]

If you uninstall your radio gear a lot, could also be as

simple as a broken antenna on your RX or a dodgy connection.

If the ESC doesn't get a clean strong signal it will stutter.

[retro]

Before I started swapping things around, I would try powering everything up and giving all the connectors and wires a good wiggle. If you can reproduce the stuttering by doing that, then it's likely just a dodgy connection and it shouldn't take too long to work out which one. If you're using Tamiya or similar type battery connectors, that would be a good place to start.

[BalmyBaldwin]

Looks like Retro gets the cheese on this one, turns out i've melted part of the tamiya plugs on my batteries and a little bit of wiggling sorted the problem for now, so the question is what plugs to go for? I heard Dean's plugs are good (whoever Dean is[])

[Top Force Racer]

Deans makes good plugs. I used to use their 4-pin power plugs because they were small. Their ultra plugs are a fine choice also. Today, I just hard wire the motor to the esc and use Duratrax's power pole connectors for the battery because they are easier to remove. They are much bigger than the Deans plugs however.