As I have explained before, I am no scientist, much less an aeronautics engineer. But I gave this question much consideration and then sat down and ritteded out (using two fingers) my thoughts. Java updated, kicked me out of everything and I cannot recover my post.
I'm not doing it all again!!!
So in brief, Pterosaurs were not capable of powered flight, they were gliders. Modern birds are capable of powered flight. To change direction quickly a bird needs to flap its wings to increase the airflow over the tail feathers. It can also alter its wing shape and attitude independently, thus giving varying power from each wing. The pterosaurs, on the other hand, had its greatest airflow at its head. Therefore, positioning of the rudder would be more effective on the head, rather than at the rear. So it seems to me that this might also be the case in a drone with its power source being at the rear, thus pushing the drone through the air, rather than pulling it.
The one thing I do wonder about, in this quest for tight turns, is just how tight can a turn be made at high speed? I would think a tight turn would be partly dependant on the speed of the aircraft. The faster it travels, the wider the turn.