Probably your receiver.
Just make sure everything is connected the right way. Check for cable breaks on all your wires. Also, don't forget to calibrate your ESC again. This is very important. About the fan, I don't know. Probably some dust which makes the fan imbalanced and thus making weird noise.
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Numquam cedunt victores, numquam ignavi vincunt.
Last edited by skyaflake; 11-05-2015 at 12:15 PM.
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