don't buy the ESC, I have one, a 50amp on a copterx XL430 motor, the soft start is a joke, my copterx BA jumps a qurter of a turn every time I start it up, the motor has loads of power, probley to much, but I like it in the BA, I will keep the motor but get a cheaper 40 amp ESC with a super soft start, if I was you I'd do the same,
copterx stuff is quite good, well made and not cheap rubbish, shame about the ESC but thats life,
I'm think of trying this one unless some one says bad things about it,[link=http://www.hobbypartz.com/volcano-40a-brushless-electric-motor-speed-controller-esc.html]ESC[/link]
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