Most likely you need a BEC. I made the mistake in telling myself I didn't need one, right before a crash with my SA. Needless to say, I ordered a 5amp BEC the same day. For your setup, a 3amp BEC will do just fine. Don't listen to anyone that says you don't need a sepererate BEC. Both my 25amp and 35amp align cutoff on me, even just for a split second, and the last one was disasterous. These ESC's come with crappy BECs that were designed for very light servos of 3 or less running on an FM only receiver. I don't even think they handle more than 1 amp of current before they starve the ESC of it's own power to process signals. Get a good BEC or crash. Hope it works out.