https://www.theregister.co.uk/2018/02/16/helicopter_crash_drone/
The crash was first reported this week by telly station
Live 5 News,
in South Carolina, USA< which saw a copy of a police report stating
that a Robinson R22 helicopter struck a tree and landed on its side.
The Robinson, which is a typical basic training light
helicopter, was being flown by an instructor and a student. The
instructor reportedly told police that his student was practising hover
taxi manoeuvring over rough ground on Daniel Island, a peninsula near
the southeast US coast port city of Charleston.
During a turn, the instructor reportedly claimed he
saw a white "DJI Phantom quadcopter" headed towards them. He took
control of the helicopter, allegedly to evade the drone, but the
aircraft's tail rotor struck a small tree. Though he got the helo down
onto the rear of its landing skids, it then turned over.
WELL.... if the pilot is telling the truth anyway. i would think DJI would know from its database if any phantoms were flying around there.