Page 25: of Maritime Reporter Magazine (May 1989)

generators on cruise ships. The use of shaft generators on a cruise ship means that high propeller speed must be maintained at small propel- ler pitch when cruising. This seri- ously decreases propulsion efficien- cy and increases the level of propel- ler-induced vibration.

For cruise ships it is therefore important to sail according to a combinator curve. Tremendous sav- ings in fuel consumption at partial speeds as well as a lower vibration level will be the results. On many of the most recent deliveries the elec- trical power is produced by auxilia- ry engines that burn heavy fuel oil.

Examples of such references are the

Sovereign of the Seas, Birka Prin- cess and Amorella.

Diesel electric machinery is a very elegant and sophisticated way to propel a ship. The main advantage is the flexibility achieved in this way. If the ship has machinery built according to the power house con- cept, there are several engines con- nected to a common electrical sys- tem from where both propulsion and auxiliary power are taken. By dividing the machinery into several units, it is relatively easy to program a load control system that will keep the engine loadings on optimal lev- els at all times. This is particularly successful if the machinery com- prises engines of different unit sizes.

In this way harbor conditions will be covered by the smaller engines and cruising condition by the larger en- gines or by a combination of differ- ent sized engines.

Diesel electric machinery usually has higher initial costs, but on the other hand it offers possibilities for secondary savings. It is all too easy to disqualify the diesel electric ma- chinery by looking at initial costs alone. However, these advantages may be difficult to estimate. There is more freedom to place the ma- chinery in areas of the ship where a diesel mechanical machinery could not be placed. The machinery can be placed for optimal stability and space utilization. In this way the total cost of the ship can be reduced.

There are some recent Wartsila Die- sel references with diesel electric propulsion: Wartsila Marine Indus- tries' newbuildings for Carnival

Cruise Line and the sail cruisers for

Wind Star Cruises and SMT built by Ateliers et Chantiers du Havre in

France.

In conclusion, even if selection of machinery for cruise ships has tradi- tionally been difficult in the past, the latest developments in medium- speed engine technology have made this job considerably easier. Wartsi- la has developed a complete range of medium-speed engines well suited to all sizes and types of cruise ships, and Wartsila Diesels have become one of the prime choices in high- class, high-powered cruise ships.

For free literature giving full in- formation on Wartsila engines,

Circle 62 on Reader Service Card

Skinner Names Gaughan

Chief Of Staff At DOT

Department of Transportation

Secretary Samuel K. Skinner re- cently named John Gaughan as

May, 1989 his chief of staff at the DOT. Mr.

Gaughan is the former Maritime

Administrator, a position he held since 1985.

The appointment of Mr. Gaugh- an means that two top level posts at the DOT have been filled by person- nel from the maritime sector. Prior to Mr. Gaughan's appointment,

President Bush named Elaine

Chao, chairman of the Federal

Maritime Commission, as Deputy

Transportation Secretary.

Marine Interiors

To Supply Seating

For 300-Passenger Boat

Marine Interiors, Whidbey Is- land, Langley, Wash., a division of

Aluma-Feather Corporation, has been selected as the manufacturer for all interior seating on board a new 300-passenger catamaran.

Called the Wave Piercer, the

Circle 221 on Reader Service Card high-speed luxury ferry will be built by Nichols Brothers Boat Builders of Whidbey Island, Wash., for use between Nantucket and Boston,

Mass.

Marine Interiors selection pro- vides another addition to its recog- nition as an industry leader in the marine transit area.

For free literature describing Ma- rine Interiors products,

Circle 4 on Reader Service Card 27

Clear the decks with Concept! !J J * |

Combined as a single unit, the monitor, keyboard and processor unit can be either bulkhead or deck mounted.

The processor can be separated from the combined monitor and keyboard unit by up to 15 metres.

The monitor can also be separated from the keyboard and processor.

Further extensions can be made with the inclusion of remote monitors. c o n c e p t A & - < ~>

Kelvin Hughes Ltd

New North Road, Hainault. Iliord. Essex IG6 2UR, England

Tel: 01-500 1020 Tlx: 836401 Fax. 01 500 0837

Kelvin Hughes (Singapore) Pte Ltd 450 Alexandra Road. Inchcape House 01-00

Singapore 0511

Tel: 473-2108 Tlx: RS23482 Fax. 479 6672

Kelvin Hughes A/S

Nordhavnsgade, OK 8000, Aarhus C. Denmark

Tel: 6-137788 Tlx: 64710 Fax, 6201833

KELVIN HUGHES