In spite of just what the ads show you, drones crash continuously. A very good drone will acquire an unplanned descent and ground interface (aka: a crash) in stride, without the need of damaging the frame. It will even involve shields to safeguard the rotors and electronics from hurt. In https://www.aeroindustrial.com/product/matrice-300-parte-15-par-de-aspas-2195-grandes-alturas/