Leadtongue,
Yea, we also saw that. The amps pulled, using a watt meter, were well within the ESCs ability. I don't remember the exact numbers, but checking amp draw is ALWAYS part of the build and a good margin of safety is built in. As a plus to Castle Creations, they warrenteed both ESCs with new ones. The only thing we could figure with the 2nd ESC starting to burn was a major malfunction upon impact or some big voltage spikes when the first one fried. Without rudders, she's pretty much uncontrollable when one motor shuts down. If I were to build one, I'd disable the BECs and run a seperate UBEC to power up the Rx & servos. This was not the case with this model, although 4 small servos on 3s shouldn't have been a problem. I've gone to using UBECs on everything. Good luck.

Rick