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Investment in Design fitted to :0047 Japan WIDE PRODUCT RANGE: 10 to 23 inch MMD - Standard display series MIL - Naval display series MMC - All-in-one display & computer Type approved by: ABS, BV, ClassNK, DNV, GL, LRS ECDIS, ARPA compliant displays I EC 945 tested Jakob Hatteland Display AS Amsosen, N-5578 Nedre Vats, Norway Tel. :(+47) 5276 3700 - Fax: (+47) 5276 5444 e-mail: jhd-no@hatteland.com - url: http://www.ha Circle 235 on Reader Service Card fyv ffffiiBjmjOiSw • no sjrSieW wSk Circle 247 on Reader Service Card Aerodynamic By David Tinsley With tall, slab sides encasing a multi- deck configuration, the pure car/truck carrier (PCTC) has a characteristically high windage factor, influencing course- Garage Ships keeping, maneuvering and fuel usage. A new series of PCTCs at the top end of the capacity range denotes a particular endeavor by Japanese shipbuilders to raise design performance through close attention to the aerodynamic properties of such vessels. Recently delivered into the long-haul vehicle trade patterns maintained by Mitsui OSK Lines (MOL), the 57.000-gt Courageous Ace embodies a refined form intended to lessen wind resistance and enhance fuel efficiency. Courageous Ace can load by David Tinsley, technical editor 6.400 automobiles of 'standard' size throughout its 13 cargo decks, and is the first of a trio from Minami Nippon Shipbuilding's Oita yard. Another three vessels of the series are in hand at Shin Kurushima Dockyard. The design has been developed in conjunction with Universal Shipbuilding Corp., and is claimed to yield operating bene- fits, such as a higher service speed for a given power, while lessening the environmental impact through reduced emissions of carbon diox- ide, and oxides of nitrogen (NOx) and sulfur (SOx) per unit load. MOL's corporate principles emphasize "safe operation and environmental protection," based on the company's environmental management system, which has led to ISO 14001 certification. The philosophy permeates the newbuild program, and the con- sideration given to the energy implications of aerodynamic form in Courageous Ace sets the pattern for future investments in vehicle carriers. Since the cargo decks in a PCTC extend right forward, encompass- ing the entire length of the hull, the vessel's elevated bow has been aerodynamically rounded and beveled along the bow line to help reduce pressure from head winds. In addition, wind channels have been created along the sides of the vessel at the top of the uppermost garage deck, so as to help counter windage and better maintain a straight course. Test results point- ed to an approximate 20 percent reduction in aerodynamic pressure at the bow in winds of 15-m /sec., thereby promising an improve- ment of about four-percent in fuel efficiency. By reducing leeway, the design is expected to raise fuel efficiency by approximately six in • i breaks up ] 2 Maritime Reporter & Engineering News
