In spite of just what the advertisements tell you, drones crash continuously. A very good drone will just take an unplanned descent and floor interface (aka: a crash) in stride, without harming the frame. It may even include things like shields to safeguard the rotors and electronics from harm. It https://www.aeroindustrial.com/product/phantom-4-pro-v2-parte-137-par-de-aspas-9455s/