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April 2011 www.sname.org/sname/mt conditions up to sea state 6 and can survive the larg- est waves in the Southern Ocean. Trials and training Both ships have successfully undergone extensive sea trials followed by a period of crew training and ship testing. Otago was handed over to the RNZN in February 2010 and Wellington followed several months later, in May. In December 2010, the Otago and Wellington carried out one of their first com- bined patrol/supply missions to Campbell Island in the Southern Ocean. During the voyage, the vessels encountered relatively rough weather and reportedly handled it well. e OPVs have a twin screw, geared diesel pro- pulsion plant, with controllable pitch propellers. e main engines are 12 cylinder Ruston RK280 diesels, rated at 5,400 kW each. ese engines are an excellent match for the OPVs because they have relatively high power to weight ratio and good fuel eciency, even at relatively low power levels. e propulsion plant is therefore quite exible and the ships can achieve 22 knots in sea state 4, but also operate for an extended period at low patrolling speeds of 8 to 15 knots. At low speeds, the OPVs trail a shaft in order to shut down one engine, enabling them to conserve fuel and pre- vent carbon buildup in the engines. To handle the OPVsĀ electrical demand including the bow thruster, three ship service diesel genera- tor sets, each of 530 kW capacity, are located below deck in a compartment independent from the main machinery. In addition, a single 100 kW emergency generator is located in a compartment in the deck- house starboard side on deck 01. OFFSHORE PATROL VESSEL BUILDERBAE Systems (was Tenix Defence) OWNER/OPERATOR Royal New Zealand Navy DESIGNERSTX Canada Marine DELIVERY February and October 2010, respectively CLASSIFICATION LRS 100A1 SSC PATROL MONO G5 ? ICE CLASS 1C, LMC UMS SHIP CHARACTERISTICS LENGTH OVERALL 278 ft., 10 in. (85 m) LENGTH, WATERLINE 254 ft., 7 in. (77.6 m) BREADTH MOLDED 45 ft., 11 in. 14 m DEPTH, MAIN DECK AT SIDE 22 ft., 4 in. 6.8 m DESIGN DRAFT 11 ft., 10 in. 3.6 m INSTALLED POWER 14,480 h.p. (10.8 MW) MAXIMUM SPEED 23 knots RANGE6,000 nautical miles at 12 knots ENDURANCE28 days TECHNICAL FEATURES TWO MAN RK! DIESEL ENGINES 2 x 7,240 h.p. (2 x 5,400 kw) TWO GEARBOXES ZF W63000 NRH TWO SHAFTS WITH CPP Propellers ? 2.8 m diameter (5 blade) FUEL OIL 370 m 3LUBE OIL 12 m3FRESH WATER 46 m 3AUXILIARY SYSTEMS THREE MAN D LE! SSDG 3 x 530 ekw ONE MAN D ! LE! EDG 1 x 103 ekw ONE BOW THRUSTER 1 x 600 h.p. (1 x 450 kw) SPECIAL FEATURES WEAPONSOne MSI 25mm DS25M AUTSIG naval gun system Two M2HB QCB 50 calibre Browning machine guns HELICOPTER FACILITIES Kaman SH-2G Super Seasprite at 6,115 kg maximum takeo weight Helicopter landing deck, hangar, refueling, and traversing systems AVIATION FUEL 5,540 U.S. gallons (21 m 3)SPECIFICATIONS: OTAGO AND WELLINGTON Otago and Wellington are capable of carrying out patrol missions in conditions up to sea state 6 and can survive the largest waves in the Southern Ocean.