I have been playing around with the Apprentice S for a short while but I'm pretty confident and have picked up learning to fly quickly. I can now fairly confidently: loop the loop, outward loop, barrel roll, do low passes and relatively long inverted flight. However, the Apprentice S is limited with aerobatics for example the rudder is not sufficient enough to knife edge and I would like to know what people recommend as a second plane for more aerobatics. Preferably, it would be electric, fairly cheap and not ridiculously hard to fly. I am not too sure whether to go with a war bird, 3D etc. Any ideas?