Page 128: of Maritime Reporter Magazine (September 1996)

PROPULSION TECHNOLOGY — High Speed & Gas Turbine Engines

Seajet 250s, Mai-Mols, has just gone into domestic service in

Denmark. This 40-knot, $31-mil- lion craft, carrying 450 passengers and 120 cars, has two GE LM500 turbines driving four waterjets through MAAG gears.

Japan reports continued promise from the two prototype

Techno-Super-Liners -- very fast, turbine-powered, half-scale freight carriers.

Waterjets are now the only pos- sible means of applying high propulsive power to fast, shallow- draft craft of this type. The light- weight construction would be unsuitable for supporting conven-

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ELECTRIC TRANSMISSION

There is only one large cruise ship (more than 50,000 gt and 1,200 passengers) on order which will not employ diesel-electric propulsion, a clear indication that the principle has come to stay — possibly employing advanced gas turbine prime movers in the future.

All of these ships employ the so- called power station system with several diesel generator sets pro- viding energy for all purposes onboard. The systems are supplied by only three long-established

European manufacturers: ABB (Stromberg); Cegelec (BTH,

Metrovick, GEC and Alsthom); and

STN (AEG). They have since been joined by Siemens, whose initial success is a major one, an 84-MVA plant powered by six Sulzer 16ZA40S engines supplying two double-wound, 21-MW propulsion motors in Princess Cruises' future flagship, the 104,000-gt Grand

Princess. Major American electri- cal engineers have been slow to return to this market in which they were very prominent during earlier brief spells of popularity.

General Electric will supply the five-generator 2 x 25,000-shp machinery for the two 85,000-gt, 2,400-passenger Disney Cruise ships to come from the Fincantieri yards in 1998.

The decision by Carnival Cruise

Lines to adopt the Kvaerner-ABB

Azipod system for the seventh and eighth Fantasy class cruise ships is a step which will also be watched with some interest. The Azipod is a streamlined pod, suspended below the stern of a ship, containing a long, small-diameter electric motor and thrust bearing connected directly to a propeller. It is capable of being rotated unrestrictedly through 360 degrees, dispensing with the need for a rudder, and capable of applying full power ahead, astern and side thrust to any angle on the beam. Elation and Galaxy, both scheduled for delivery in 1998, will have the same power as the others of the class, but applied by two 14-MW

Azipods with tractor propellers.

The advantages are many, namely: control is readily incorporated in (Continued on page 132)

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Circle 225 on Reader Service Card 130 Maritime Reporter/Engineering News