Abstract: There is disclosed a flight control system, the flight control system including a Remotely Piloted Aircraft (RPA) and a ground-based control centre, wherein the RPA and the ground-based control centre are configured to communicate using a plurality of different communication systems, wherein the RPA includes a computer system configured to determine operation risk, wherein the computer system receives input from the ground-based control centre for use in the determination of operation risk, wherein the computer system is configured to select a communication system from the plurality of different communication systems, and to use the selected communication system for communication between the RPA and the ground-based control centre, based on the determined operation risk.

Abstract: A method of, or system for, controlling a pilotless device, uses independent data links that provide multiple, redundant data channels. First, a direct radio link with a ground control station is used to receive command signals that enable a pilot to issue commands to an autopilot in the device, or to directly control the device. Secondly, there is an indirect control link with the ground control station, via satellites, that is used to send command signals to the device and to send back flight information and position data from a GPS or other satellite-based position receiver in the device. Thirdly, there is an indirect position data link back to the ground control station, via low earth orbit satellites, that is used to send back position data from a different GPS or other satellite-based position receiver in the device.

Abstract: A riser system configured to be secured between a surface vessel and a subsea location comprises a primary conduit and an auxiliary conduit extending adjacent the primary conduit, wherein the primary and auxiliary conduits are connected together at an axial location along the riser system via a connecting portion. The auxiliary conduit comprises a composite material formed of at least a matrix and one or more reinforcing elements embedded within the matrix.

Abstract: A riser system configured to be secured between a surface vessel and a subsea location comprises a primary conduit and an auxiliary conduit extending adjacent the primary conduit, wherein the primary and auxiliary conduits are connected together at an axial location along the riser system via a connecting portion. The auxiliary conduit comprises a composite material formed of at least a matrix and one or more reinforcing elements embedded within the matrix.

Abstract: A riser system configured to be secured between a surface vessel and a subsea location comprises a primary conduit and an auxiliary conduit extending adjacent the primary conduit, wherein the primary and auxiliary conduits are connected together at an axial location along the riser system via a connecting portion.