Helicopters are pretty safe (well, not quite as safe as airliners but not bad, just stay away from the really small ones). But rotorstrikes  with metal&#x2F;plastic composites change the equation in a fairly bad manner. Especially a tail rotor would be pretty easy to break with a 3 pound drone and losing the tail rotor on a helicopter makes your day suddenly much more interesting.<p>Has there been a controlled test where someone flew a drone purposefully into the rotor of a helicopter?