rapid passenger entry and egress, so that turn-round times could be improved at peak periods. Another requirement was to retain usability of the top deck usable, with seating and access stairs. Working with BMTNGA, FBMA
have come up with a catamaran that incorporates a single large passenger deck with a full-width superstructure and bridge. Although steel construction was considered for its strength properties, calculations showed that the resulting structure would have been too heavy and aluminium, the material used in the existing vessels, was instead selected. However, higher material gauges and scantlings have been specified for areas likely to experience high docking stresses. Tis has resulted in a design displacement of 130tonnes, including provision for 2.5tonnes of fuel, a tonne of potable water and another tonne of black water. Te new vessels are 40.9m loa, similar
to the existing craft, and 38.6m at the waterline. Maximum beam is 12m (compared with 10m) and hull draught is 1.6m (compared with 1.7m). Each of the twin hulls is of conventional form with long parallel sides, tapered symmetrically towards the bow, and moderate V planing sections further aſt. The exterior has side fairings that
sweep forward from the front end of the passenger accommodation to the bows, forming protection for the foredeck. An upward sweep of the sheerline forward gives the bows extra buoyancy. A pronounced full-length strake at gunwhale level, along with diagonal strakes located aſt of midships, help protect the hull from alongside contact. Side decks aſt derive overhead protection from faired outward extensions of the upper deck. Bicycle stands located on the after deck will enhance Wightlink’s utility for commuters who use morning and evening services.
Propulsion requirements Te vessel is propelled by two 820kW CAT/ Cummins KTA38 diesel engines driving conventional propellers via ZF 3050 gearboxes. Propellers were chosen as they offer a lower-cost solution over waterjets and also have a lower underwater profile. Tank testing was undertaken to validate this decision and designers concluded that the drive combination meets Wightlink’s
Ship & Boat International March/April 2009 RWO Anzeige
60x269.indd 1
Wightlink specified a more rugged structure for its new catamaran design to better withstand docking procedures in inclement weather conditions.
requirement for a service speed of some 20kts at 85% mean cruise rating. Te engine room, located aſt under the rear passenger cabin, also accommodates Volvo generator sets. Te vessel is steered by twin rudders located close abaſt the propellers so that prop-wash can be applied against them to enhance manoeuvrability. Te power installed is less than half the 4000kW available from two 16-cylinder MTU diesels in each of the present craſt, resulting in lower acquisition and running costs. Another cost reduction feature is that the design allows for operation by an on-board crew of three personnel rather than the 4-5 crew that man the existing craſt, reflecting improvements in control and navigation technologies. FBMA won the prime contract to
supply the craft after an international tender process, and the two vessels are being built at FBMA’s shipyard at Cebu in the Philippines. They are due for delivery this year, with service entry of the first provisionally scheduled for July. BTMNGA were able to base the design partly on two 40m 354-passenger craſt it designed for service at Setubal in Portugal. FBMA is able to produce and market BMNGA designs as a result of an agreement concluded between the two companies three years ago. Te new vessels are designed to High Speed Code 2000 Category A standard and meet Maritime and Coastguard Agency and EU regulations. The UK-flagged craft will also meet Lloyd’s Register 100A1 SSC G3. Te new vessels are part of a £9 million investment in the Portsmouth- Ryde operation, including shoreside retail facilities and other improvements. SBI
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