Abstract: A firefighting apparatus comprising at least one Unmanned Aerial Vehicle (UAV) 11, the at least one UAV 11 comprising an engagement mechanism 96, 61 for releasable engagement with a container 22 containing a fire suppressant medium. The apparatus further having a cannon 92 for releasing or directing the fire suppressant medium from the container 22 and a ground support base 10 configured to carry a plurality of containers. A controller in operable communication with the at least one UAV 11, the controller configured to receive and/or or calculate information in relation to the levels of fire suppressant medium in the container 22 carried by the at least one UAV 11 and to direct the at least one UAV 11 to return to the ground support base 10 to replenish, or deposit and replace, the container should the contents of the receptacle be depleted beyond a threshold value.

Abstract: A propulsion system for a multirotor aircraft, the propulsion system comprising: at least one power generation module configured to provide a first source of electrical power to one or more propulsion assemblies of the multirotor aircraft; a control system which is configured to determine the required electrical power demand of the propulsion assembly and calculate a predicted electrical power demand for a following period of time; wherein the control system is configured to alter the electrical power produced by the power generation module such as to produce a power envelope which comprises the electrical power produced by the power generation module corresponding to the predicted electrical power demand; wherein the control system is configured to determine if the power envelope meets the required electrical power demand; and wherein when the power envelope is less than the required electrical power demand the control system is configured to selectively connect a second source of electrical power for supply

Abstract: An apparatus for control of multi-rotor aircraft comprising a rotor arrangement 10 having a plurality of rotors 11, each rotor being located on a rotor arm 12. The forward and rear arms 13, 14 are extensible arms 13, 14 having rotor actuators 15 such that the rotors of the forward and rear arms are movable rotors 16. The rotor actuators 15 are configured to move movable rotors 16 relative to the other movable rotors 16 and fixed rotors 18 of the rotor arrangement 10 such that location of the centre of pressure of the rotor arrangement 10 is adjusted relative to the centre of gravity of an associated multi-rotor aircraft 17.