through Reintjes ZWVS 440/1 two-speed gearboxes. Manoeuvring is enhanced by the incorporation of a pair of 51kW bow thrusters. The generator sets take the form of a pair of Caterpillar C2.2 Ts with a capacity of 2 x 22.5kW/28.0kVA.
A Sea Axe Stan Patrol 5009 for Cape Verde is approaching completion. Te first example of the Twin Axe, a wind
turbine support vessel, was exhibited at Seawork 2011 in Southampton in the UK in June. Designated as a High Speed Support Vessel, or HSSV, it has now been delivered to MarineCo in the UK. Mr Gelling said the company had paid
particular attention to the design of the shape of the tunnel on the Twin Axe.
“Te tunnel has a very rounded shape,” he explained, “much more than is the case in a conventional catamaran.” Both the hull and the superstructure are constructed out of aluminium. The main engines are a pair of
Caterpillar C32 TTA B units that provide up to 1790kW (2400bhp) in total. Te engines drive fixed-pitch propellers
Special features Apart from its dramatically improved performance compared with a conventional catamaran, the first Twin Axe has a number of special features. Tese include: bow fendering designed for impact speeds of more than 3knots without damage to the ship’s structure; an aft wheelhouse/accommodation block for lowest possible accelerations; a flexibly mounted wheelhouse for lowest possible noise levels; and a two-step gearbox for maximum bollard pull without engine overload at zero speed. MarineCo’s Twin Axe also has a cargo deck for 2 x 20ſt containers (maximum 15tonnes); a diving/rescue platform aſt; and a three-point mooring system. The design can also be customised to meet user-specific requirements with, for instance, a moonpool and extra accommodation. Another option is the ability to transfer fuel from the vessel for use by equipment used to service a wind turbine. Mr Gelling said a vessel with the
same hull type has also been ordered by GeoSea, part of the DEME group in Belgium, which will also use the craft to service offshore wind turbines. The company is also developing a 46m Twin Axe intended for use as a 35knot crewboat for around 150+ passengers. Te same design could also be used as a platform for the Ampelmann offshore access system, which can be used to transfer men and equipment from a vessel to an offshore wind turbine, another vessel or an offshore platform. Te company is also considering applying the Twin Axe concept to patrol boats and survey vessels in the 26-46m size range. Orders for Sea Axe vessels also continue
The Twin Axe takes the Sea Axe concept and applies it to catamarans. Warship Technology October 2011
to be placed by a wide range of customers. Among them are fast support vessels for the offshore oil and gas sector for use in the Middle East and in the Mediterranean, a number of pilot boats, tenders and super yacht tenders. WT
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