I build a quad, and i use arducopter to run this.
I have done all the calibrating, but when i use the throttle one motor is starting up a second after the other 3... I have not done anything with the ESC, i tried to connect a programming card to see if the ESC had some other programming, but the ESC didn't support programming card...
I use this [url=http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=4204]ESC[/url]
and this [url=http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8622]Motor[/url]
I am about to test tomorrow when it's less windy to see if it matters... Today it just drafted to one side, but if i tried to tilt it back it worked...