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I have a new HK Pursuit with a SSS 3660 1620kv motor . It's been running great on 4S batteries. Decided to up the game to 6S. A coworker gave me (4) 3S 2200mAh 30-40C batteries. I rigged two pairs up in parallel, to get capacity up to 4400mAh, and then joined them in serires to get 6S. Boat definitely ran faster than the 4S runs for maybe a minute then stopped. I had to paddle out to get it. On shore, I opened it up and saw just a little smoke come out. Nothing was hot, no batteries, motor or ESC. Disconnect everything then systematically tried tesesting out the various battery sub-assemblies. ESC responded correctly every time. When I pull the throttle trigger, I get a short, SLOW, stuttering turn of the motor then nothing. Still a burning smell hours later. Did I burn the motor out? If so, why? I thought this motor could handle 6s. The prop was not aggressive, x442.IMG_6246.jpg
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SSS are not the highest quality motors out there, but I suspect that the problem may lay with the ESC. A 4400 mAh 30C pack may not supply the power needed, and combined with all the extra wire and high restance plugs is over-stressing the controller with excessive ripple current. What ESC is in the boat?
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It's a Seaking 180A and I used robust (10GA) wire for the harness with OSE 6mm ConnectorsComment
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Wire diameter is less important than short length in reducing inductance. Seven twin connections is a lot of resistance. SK-180 v-3s are not as robust as the v-1. Or maybe you just got a bad one. Part-throttle running heats the ESC a lot. The wrong timing for the motor can overheat the controller. A wet running boat adds heat.
Likely it was a combination of some or all the above. Or it's the motor, have you tried another one?
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Motor is done...
The short, SLOW, stuttering turn says it all. The SK180 V3 is fine if its powering up and causing the motor to turn at all. I use this esc in 3 of my boats and this is common indicator of blown motor.
Throw in a 40mm motor if you want to run 6S and make sure the boat isn't running to wet (to much hull in the water). Center of gravity should be about 10 to 10.5 inches from the transom on that boat.
And I agree with Fluid... too much wire and too many connectors isn't helping the situation.Have fun with that....
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Oh... there is a small chance you have a melted solder connection between the esc and motor. I had a motor act that way once only to find a connection went bad.Have fun with that....Comment
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Thanks so much for the comments. When I put in a single battery, the ESC acknowledges everything normally (3 beeps for 3S, 4 beeps for 4S, 6 beeps for 6S). Hoping its not the ESC as I thought my initial investment was solid on that item.Comment
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When you say
I get a short, SLOW, stuttering turn of the motor then nothing.
First thing I would check is the 3 wires that go from esc to motor
If the solder gets hot or a poor job and lets go a little will give a bad contact and make a motor behave that way
If you have another motor with the same size connectors I would just hook it to the esc to see what happens (stutters or not)Comment
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Have fun with that....Comment
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Here's a short video of the motor trying to run afterwards and one of the infamous run. The wisp of smoke was small but there. Nothing was hot. It was hard to tell but, it seemed like maybe more of the smell was coming from the ESC. Again, I really hope its not the ESC, was planning on replacing the motor eventually anyway. I'll check the connections between the ESC and the motor.
Last edited by ydesigner; 10-30-2016, 03:51 PM.Comment
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