I've tried "out flying" the hawks and I agree that it can't be done. They can fly circles around anything I've chased them with. They also have the obvious advantage of having a self contained control system VS a guy standing 300 feet away with a radio in his hands.

If a nice, quiet glider had a shrieking siren that the pilot could activate by surprise... it would either scare the bird away, or infuriate it even more.......