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Old Mar 17, 2012, 01:27 AM
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lipoflyer's Avatar
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HK ESC + Turnigy Motor Timing Issue

Running a 270kv Turnigy 5060 with a 17x8 prop
ESC is a 60-70 HKSS

Motor throttle up fine for 30 seconds then starts to jump between low throttle and high throttle. ESC is cold, Motor is cold.
Pull the power and straight away plug it back in you will get another 30 seconds before the same problem occurs.

Any ideas what might be wrong here?
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Old Mar 17, 2012, 03:11 AM
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Letchworth, Great Britain (UK)
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Some ESCs pulse the motor to notify you they've reached lvc. Could this be what's happening? If so, is your battery fully charged, and large enough to supply the amps your motor wants? Or is your ESC set for the wrong cell-count?
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Old Mar 17, 2012, 11:52 AM
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Canada, ON, Owen Sound
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You are likely hitting LVC as previously mentioned. Unplugging/replugging gives the battery a little time to recover. If your using too small a battery (mah), that would easily explain the 30 second run time. Even a large battery with a too low "C" rating can do the same thing.
Try a battery with at least 5000mah capacity, I'd suggest a 30C rating in whatever cell count you use. That would deliver the amps required with the capacity to sustain flight times. FWIW Doug B
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Old Mar 17, 2012, 05:02 PM
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I am no way near LVC and i'm using a watt meter to determine that

Before it does it you can hear a couple of metalic clunks and then it starts throwing the prop around
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Old Mar 18, 2012, 11:10 PM
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Check magnets and bearings, clunking could indicate a loose magnet(s) or a damaged bearing. HK motors are rather famous for throwing magnets, and bearing issues. FWIW DougB
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Old Mar 19, 2012, 07:41 PM
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I've always found their motors to be good and had no issues.

I have true two motors of the same size/make with the same results. I'm suspecting the esc is the cause.

Is it possible to reflash an esc???
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Old Mar 20, 2012, 10:19 AM
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Sounds to me like the ESC and I would try it with another motor. Also, what is the max voltage rating for the ESC? I think it's 22 volts, are you exceeding that?

The only other thing that would cause that would be one winding in the motor shorting out as the motor spins up.
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