HK ESC + Turnigy Motor Timing Issue - RC Groups
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Mar 17, 2012, 02:27 AM
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lipoflyer's Avatar

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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Mar 17, 2012, 04:11 AM
Registered User
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?
Mar 17, 2012, 12:52 PM
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Doug Bartley's Avatar
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
Mar 17, 2012, 06:02 PM
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lipoflyer's Avatar
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
Mar 19, 2012, 12:10 AM
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Doug Bartley's Avatar
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
Mar 19, 2012, 08:41 PM
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lipoflyer's Avatar
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???
Mar 20, 2012, 11:19 AM
Suspended Account
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.
Last edited by buracho topspin; Mar 20, 2012 at 11:25 AM.

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