ORIGINAL: CGRetired
Just remember one major issue here. If you fly it to the point of battery exhaustion, you just may not have enough left to operate the receiver and servos. And, I hope you can picture what will happen if you lose the receiver on a landing attempt. This can be a major problem with electrics and beginners. When it starts to get sluggish, LAND IT!!
CGr.
Most speed controllers, if setup correctly, have a low voltage cuttout that cuts power to the motor at a preset level but still supplies power to the servos. Some, used in helis, reduce power to the motor, in either case there should be enough reserve to get back to the runway and land. (lowering the throttle all the way usually will re-activate the motor for a short time)
I am not sure about the RTF models like the Super Cub, is the ESC programmable at all? This may be another drawback of this model?