First Order For Dolphin Propulsion System

Seven Seas Voyager, the new 50,000-gt cruise ship under construction by T. Mariotti at its Genoa yard for delivery to Radisson Seven Seas in 2003, will be among the first ships to be equipped with the new Dolphin podded propulsion system, a system which was jointly developed by STN ATLAS Marine Electronics and John Crane-Lips.

Podded propulsors of the system are designed to deliver 2x 7,000 kW at 170 rpm. Main features include integration of a powerful electric drive into a hydrodynamically optimized pod below ship, resulting in a directly-driven propeller. Extensive CFD analyses and model tank tests have led to the development of a pod shape with enhanced efficiency and maneuvering characteristics.

Dolphin has been developed for power ranges extending from 3 MW to more than 19 MW and is suitable for a wide variety of vessels designed for high speed and good maneuverability operation. With a continuous rotation angle of 360 degrees in the vertical axis, the pod ensure optimum maneuverability for commercial vessels as well as those engaged in offshore dynamic positioning.

The standard drive of the fixed-pitch propeller includes an air-cooled six-phase synchronous motor; gears, shaft systems, rudders and stern thrusters forming part of conventional electric drives are not required. The system's shaft is protected within its casing by a combination of face and lip seals.

In addition to the Dolphin system, the scope of delivery by STN ATLAS Marine Electronics and John Crane-Lips for Seven Seas Voyager includes a complete propulsion system with synchro-converters, control and joystick system, diesel alternators, and a highvoltage distribution assembly with propulsion and main transformers as well as bow thrusters.

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Maritime Reporter Magazine, page 54,  Apr 2001 Voyager

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.