One thing I forgot to mention in all my blabbering.
ALWAYS try to keep the airplane upwind. (Wind blowing in your face). If it gets downwind too far, the "Goddess of little Airplanes" can take control and you can lose orientation and in most cases lose it all.
Just as in Full Scale aircraft, the weather is part of the equation. Getting caught in the air when a rainstorm hits, with an electric plane can be a serious problem. Lost one that way. Water and electricity do not mix well at all. We wont discuss thunderstorms and the 4 ft antenna in your hands.