Uav with protective outer cage

Unmanned aerial vehicle (UAV) comprising an outer protective cage, a propulsion system mounted inside the outer protective cage, a sensor support system fixed on the outer protective cage and a sensor system coupled to the sensor support system, wherein the sensor system is coupled to the sensor support system via a coupling mechanism that comprises a spring coupling exerting an elastic bias against the sensor system towards an operating position, the sensor system being retractable into the outer protective cage against the elastic bias of the spring coupling upon collision with an external object, and wherein the coupling mechanism further comprises a load limited releasable rigid coupling providing a stable rigid positioning of the sensor system in said operating position, the rigid coupling being releasable upon exercise of a collision force greater than a predetermined threshold.