I have seen the RC Cobra helicopters, and thought "Wouldn't that be an entertaining way to chase off predators?"
The hawk sitting on a perch watching your hens.
The 'coon/fox heading for the
chicken coop.
The squirrel who thinks you fill the bird feeder just for him.
Perhaps even the brown bear raiding your trash bin.
It would put the fear of the Almighty into almost any critter.
All from the comfort of your front porch, without even spilling your beer.