Following is a transcript of the video. This helicopter has dual-crossing rotors for increased precision The K-MAX uses a unique double rotor system where the two rotors cross each other.

It’s got the usual trappings of a drone, but with only a single rotor it clearly can’t be called by any of the standard multicopter names. Helicopter? Close, but not quite, since the rotor ...

report into the crash found cockpit pedals had disconnected from the tail rotor, which had caused the helicopter to spin out of control. The final report into the crash has yet to be released but ...