Power systems group Rolls-Royce has won orders from a variety of customers worth in excess of 70m pounds to supply large thrusters for offshore drilling vessels.The group said that the orders are driven by a greater demand in oil and gas exploration in deep water and harsh conditions, as customers expand their drillship fleets."Numerous drillships with Rolls-Royce thrusters have been delivered in the past few years, making Rolls-Royce the clear market leader for this type of propulsion," said Helge Gjerde, the Senior Vice President of the firm's Offshore division."We are very pleased to see that customers in this industry continue to have confidence in our abilities to support their business with mission-critical systems, products and services."The drillships operate in dynamic positioning mode, using satellite technology to automatically maintain position without anchoring.BC