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September 24, 2018, 07:29:31 AM

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Author Topic: Foamy Wot4 ESC is faulty, no interest from the supplier.  (Read 262 times)

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Offline FlyinBrian

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Foamy Wot4 ESC is faulty, no interest from the supplier.
« on: September 12, 2018, 13:22:15 PM »
Bought a foamy Wot4 at the end of May, to replace a n old one that I shredded through a hedge.
Flying the new Wottie last week - on about its 12th flight perhaps 15th and the motor started "stuttering" and made weird noises. Landed, checked things out and put in a new battery. The ESC would not start the motor just rocked the prop back n forth.

I had earlier on ( after a prop change ) checked current draw which was 32A dropping after a 30 sec period to about 28A so motor or ESC not overloaded. Later after about an hour I tried again and the motor ran but again with the hesitation and stuttering.

Contacted the supplier Kings Lynn Model shop, I was told that the model had probably nosed over at some point and stalled the prop resulting in the ESC failure. All I can say is that it is a cr.p ESC that fails from a little nose over. I have stalled motors many times without issue however this one can not take it.
Attitude of KLMS is - No replacement - full stop!
« Last Edit: September 12, 2018, 13:46:37 PM by FlyinBrian »
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Offline PDR

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Re: Foamy Wot4 ESC is faulty, no interest from the supplier.
« Reply #1 on: September 12, 2018, 14:34:38 PM »
If it's "rocking back & forth" it sounds like the ESC isn't actually blown - the magic white smoke is probably still trapped inside, but one of the three ESC-motor wires is disconnected, so it may be fixable.

Take the prop and cowl off and move the esc to outside the aeroplane. Then STILL WITH NO PROP connect a battery and set the throttle to about 25% (not critical). If it's "rocking" then manipulate each of the wires at the ESC, at the connector and at the motor. If moving in one of these places make the motor run or stutter differently then that's where the failed joint is. On most ARTFs it's often the wire-to-connector joints that can benefit from better soldering. If it's at the ESC end then you'll want to cut away some of the heatshrink jacket to get at the joint. If it's at the motor it may still be fixable, or it may be a failed winding.

But a generic 40A ESC isn't a bank-breaker (a tenner plus connectors, typically), so if you can't get any joy from KLMS (RCMF's charlieC is the one to talk to about that) then at least returning it to the air won't need a major investment.

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Offline jwb

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Re: Foamy Wot4 ESC is faulty, no interest from the supplier.
« Reply #2 on: September 12, 2018, 23:40:21 PM »
I had a similar problem with a Foame Acro Wot, which had had many hundreds of fights.  Assumed it was the ESC, bought and fitted a new one but still the same.  Checked the motor and one of the windings had gone open circuit.  The moral is, assume nothing and check everything before buying a replacement.

Offline grj

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Re: Foamy Wot4 ESC is faulty, no interest from the supplier.
« Reply #3 on: September 14, 2018, 09:16:35 AM »
You might also try unplugging the speed controller from the motor and check the solder joints on the plugs and sockets. I've had a joint fail but not come off completely, resulting in the same issue. Pull each plug hard, to be sure.


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