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Old Jul 09, 2012, 02:15 PM
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Alex Schauer's Avatar
United States, MN, North Mankato
Joined Feb 2011
4,667 Posts
Help!
Mystery ESC Not working correctly!

I have a Mystery ESC, and I used it in my Piper Cub....and that crashed due to overcurrent. It was a cheapo motor from Leader's hobby and they said to use a 40A ESC...I should have known better

But then I tried it (on land) and it still worked fine.
The next time I tried it, it didn't.

The motor sounded different, and it cogged upon startup. But after the cogging it ran. (About a second of cogging)

BBBUUUUT....I wouldn't care about all this if It weren't for that I have about half power. I put it back in my EPP slick and I couldn't even hover!
I thought, hmm well maybe I forgot to charge this battery....
I tried all of my batteries and they proved innocent. Even took a voltmeter to them.

I think this ESC might be toast...but I'm low on funds, so can you guys please try to help?
Thanks!
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Old Jul 09, 2012, 02:36 PM
Wake up, feel pulse, be happy!
C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,425 Posts
What's the ESC's current rating, and how much current was the Cub's motor actually drawing? LH might have suggested a 40A ESC for the motor, but that doesn't tell us anything about how much it was actually drawing.

And we REALLY don't know anything without knowing the ESC's rating.

It sounds like the ESC is on its way out, though. ESC failure symptoms can have a whole lot of variations, but generally if the ESC isn't working properly then it's probably dying or dead.
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Old Jul 09, 2012, 03:48 PM
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Alex Schauer's Avatar
United States, MN, North Mankato
Joined Feb 2011
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It was a 40A esc, and I don't know what the motor pulled.
Should I just toss it?
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Old Jul 09, 2012, 05:14 PM
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Toronto Canada
Joined Dec 2002
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Have you calibrated the endpoint on your ESC?
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Old Jul 09, 2012, 05:14 PM
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Alex Schauer's Avatar
United States, MN, North Mankato
Joined Feb 2011
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Yep
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Old Jul 09, 2012, 05:31 PM
Wake up, feel pulse, be happy!
C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,425 Posts
Ok then, do you have a link to the motor? Also, what prop were you running, and what battery? The more specific info you can give, the better.

Do you have a wattmeter?
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Old Jul 09, 2012, 08:41 PM
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Alex Schauer's Avatar
United States, MN, North Mankato
Joined Feb 2011
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No wattmeter....Yes I know...I should get one.
I was running an 11x5.5E APC
Zippy 2200 3S 35C
3 Standard servos
https://www.leaderhobby.com/product....=9394001224126
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