Flying a drone in complex environments can be still challenging even though these flying robots are getting smarter all the time. Drone crashes can happen for a variety of reasons. The Rotorigami ( Rotary Origami Protective System ) is an impact protection system that enables drones to survive challenging environments. It has a:
free-to-spin circular protector that is able to decouple impact yawing moments from the vehicle, combined with a cyclic origami impact cushion capable of reducing the peak impact force experienced by the vehicle.
Such an approach can enable drones to navigate in heavily cluttered environments safely and efficiently. More info is available here.