[ 137 ] drag and improve efficiency when fins are in use and when not deployed. The head boxes were optimised and ‘smoothed’ to become part of the hullform. FREQUENCY CONVERTERS ON ELECTRIC MOTORS Frequency converters have been fitted on most large electric motors and these are used on systems such as the cooling systems. The motors provide power to the systems, but are not always kept at full load, and can benefit from being connected to a frequency converter which is a device that converts one frequency of alternating current (AC) to another frequency of AC. BATTERY HYBRID PROPULSION The generators and the batteries provide electrical power to the propulsion system which is transferred electrically to each propeller via a motor controller and electric motor. The system has multiple generators and multiple motors and batteries connected to a common electrical bus. By using hybrid or electric propulsion, there is inbuilt flexibility that not only reduces emissions and optimises fuel consumption, but the system is lighter and takes up less space, with lower noise and vibration levels and reduced maintenance costs. ULTRA-ECONOMIC ENGINES The four Wärtsilä 16V31 generators are designed to provide efficiency and a good emissions performance across a broad range of operating parameters. The mediumspeed four-stroke engine holds the Guinness World Record for lowest fuel consumption. The generator’s modular design enables a significant reduction in maintenance time and costs, thereby improving power availability and reducing the need for spare parts. The generators will retain their high efficiency and environmental values throughout the entire lifecycle of the ship, delivering a low fuel consumption over a wide operating range, with a high cylinder power. HULL PAINT AND TRIM OPTIMISATION The ship’s hulls are coated with Jotun SeaQuantum Classic S antifouling paint. It provides excellent protection and incomparable hull performance. This is achieved through highly predictable and stable self-polishing characteristics, reducing hull deterioration, friction and speed loss. To further reduce hull resistance, a trim optimisation system has been fitted, resulting in a reduced demand on power. LIGHTING LED lighting has been fitted throughout to reduce electrical load. The dimming system and daylight sensors in passenger spaces reduce lighting levels when not needed. Passive infrared (PIR) or motion sensors in back-of-house spaces guarantee that lights, save for emergency lights, are only on when required. Lights can still be switched on manually if need be. Crew cabins are fitted with hotel-style card switches so that TVs and lights are only available when the key card is in the slot. “ By using hybrid or electric propulsion, there is inbuilt flexibility that not only reduces emissions and optimises fuel consumption, but the system is lighter and takes up less space, with lower noise and vibration levels and reduced maintenance costs” LEGACY
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