A drone hitting the tail rotor of a helicopter will drop it right out of the sky. A drone crashing into the leading edge of a jet's wing will hole it mightily (

A drone hitting the tail rotor of a helicopter will drop it right out of the sky. A drone crashing into the leading edge of a jet's wing will hole it mightily (there's a video online if you google it.) Birds can do serious damage too but birds usually try to avoid low, slow aircraft. Drones don't.