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Lake-class inshore patrol vessel

From Wikipedia, the free encyclopedia
For other uses, see Protector class and Lake-class patrol vessel.

HMNZS Rotoiti and HMNZS Pukaki in 2010
Class overview
NameLake class
BuildersTenix Defence, Whangārei
Operators
Preceded by
CostNZ$35.8 million (2008) per unit
Built2005–2008
In service2009–present
In commission2009–present
Completed4
Active2 (New Zealand) 2 (Ireland)
General characteristics
TypeInshore patrol vessel
Displacement340 tonnes (loaded)
Length55 m (180 ft)
Beam9 m (30 ft)
Draught2.9 m (9.5 ft)
Propulsion
  • Two MAN B&W 12VP185 engines, each rated at 2,500 kW (3,400 hp) at 1,907 rpm
  • ZF 7640 NR gearboxes
  • Two controllable pitch propellers
Speed
  • Top speed 25 knots (46 km/h; 29 mph)
  • Patrol speed 16 knots (30 km/h; 18 mph)
Range3,000 nautical miles (5,600 km; 3,500 mi)
Boats & landing
craft carried		2 × RHIB with diesel-powered three-stage jet units
Complement36 (includes 4 government agency staff and up to 12 others)[1]
Armament
Notes[2]

The Lake-class inshore patrol vessel (also known as the Rotoiti class and the Protector class) is a ship class of inshore patrol vessels (IPVs) of the Royal New Zealand Navy (RNZN) which replaced the RNZN's Moa-class patrol boats in 2007–2008. All four vessels were originally named after New Zealand lakes. Two of the ships were sold to Ireland in 2022.

Following long-running Navy retention problems in the wake of NZDF "civilianisation", two of the four vessels were tied up, inactive, in a 'Reduced Activity Period' for long periods between 2013 and 2018. In June 2019 the New Zealand Government announced that two of the patrol vessels would be withdrawn from service, and they were decommissioned in October that year. Both were later sold to the Irish Naval Service.

Design and construction

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Conceived as part of Project Protector, the Ministry of Defence acquisition project to acquire one multi-role vessel, two offshore and four inshore patrol vessels. The Project Protector vessels were to be operated by the RNZN to conduct tasks for and with the New Zealand Customs Service, the Department of Conservation, Ministry of Foreign Affairs and Trade, Ministry of Fisheries, Maritime New Zealand, and New Zealand Police. The future duties will include maritime surveillance and boarding, support to civilian agencies such as the customs service and search and rescue duties.[2]

Engine room of HMNZS Hawea

The ships were built in Whangārei by Tenix Defence, and are based on a modified search and rescue vessel for the Philippine Coast Guard, with a different superstructure design. The cost for the four vessels was planned to be NZ$100 million.[2] Friction stir welding was used in the construction of the superstructure, and Donovan Group being the first New Zealand company to use the technique, which is credited as having won them the contract for this part of the vessel's construction.[2][3]

Capabilities and features

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The IPVs will normally be used for inshore tasks within 24 nautical miles (44 km; 28 mi) of the coastline.[2] However, they will have operational ranges of 3,000 nautical miles (5,600 km; 3,500 mi). Together with their improved speed, this will be sufficient to intercept, for example, large off-shore fishing trawlers working illegally in New Zealand waters.[2] Each vessel was intended to achieve 290 available patrol days per year.[4]

M2 12.7x99mm (.50-cal) machine gun on HMNZS Hawea

The ships were intended to have the ability to patrol (including receiving vertical replenishment) in up to sea state 5 (seas rough, waves 2.5–4 m (8.2–13.1 ft)) and have the ability to survive in conditions of up to sea state 8 (seas very high, waves 9–14 m (30–46 ft)). However, boat deployment and recovery will be limited to sea state 4 (seas moderate, waves 1.25–2.5 m (4.1–8.2 ft)). These parameters are much more capable than the Moa class which they replace.[2] The shipbuilder claims "the vessel is more than capable of extending the Crown's operational envelope to Southern Ocean patrol duties". [citation needed]

Irish Naval Service

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In August 2021, an article in the Irish Examiner reported that Ireland's Department of Defence was exploring the possibility of purchasing two of the Lake class inshore patrol vessels for the Irish Naval Service. It was reported that the ships would be used for fisheries protection and patrolling in the Irish Sea following Britain's exit from the European Union. The Lake class vessels are seen as suitable for the calmer conditions of the Irish Sea, and would allow the larger offshore patrol vessels (OPVs) of the Irish naval fleet to focus on Atlantic Ocean operations.[5]

On 13 March 2022 the Irish Department of Defence confirmed the acquisition of the two retired Lake-class IPVs, HMNZS Rotoiti and HMNZS Pukaki for €26 million. The two Lake-class ships are due to replace the Irish Naval vessels LÉ Orla and LÉ Ciara. Both Lake-class IPVs underwent restoration work to bring them to Lloyd's Classification in New Zealand before they were transported to Ireland.[6] The vessels arrived in Cork Harbour on 14 May 2023 after departing New Zealand in early April aboard the heavy lift vessel Happy Dynamic.[7]

These ships are expected to operate primarily in the Irish Sea and off Ireland's South East coast and likely be based in the port of Dún Laoghaire in County Dublin. The vessels may also undergo an armament upgrade from the current three 12.7mm HMGs, to a 30mm or 40mm main gun.[citation needed] On 5 April 2024, the Irish Department of Defence announced that the vessels would be named LÉ Aoibhinn and LÉ Gobnait.[8][9] The ships were commissioned on 4 September 2024 in Haulbowline.[10]

Ships in class

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 Royal New Zealand Navy
Name Pennant no. Commissioned Decommissioned Status
HMNZS Pukaki P3568 14 May 2009 17 October 2019 Sold to Ireland
HMNZS Rotoiti P3569 17 April 2009 17 October 2019 Sold to Ireland
HMNZS Taupo P3570 29 May 2009 In active service
HMNZS Hawea P3571 1 May 2009 In active service
 Irish Naval Service
LÉ Aoibhinn P71 4 September 2024 [10] In active service
LÉ Gobnait P72 4 September 2024[10] In active service

See also

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References

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  1. ^ Rotoiti – P3569 (from the Royal New Zealand Navy website. Accessed 2008-04-21.)
  2. ^ a b c d e f g Welded Bliss – e.nz. magazine, Engineering New Zealand, March/April 2008, Volume 9/2
  3. ^ Friction stir welding at Auckland University of Technology (AUT)
  4. ^ "Royal New Zealand Navy".
  5. ^ "Department of Defence looking to buy New Zealand naval ships". 12 August 2021.
  6. ^ "Announcement of the purchase of two Inshore Patrol Vessels (IPVs) from the New Zealand Government". 13 March 2022.
  7. ^ "Two new Irish Naval vessels to arrive into Cork Harbour tomorrow". 13 May 2023.
  8. ^ "Tánaiste and Minister for Defence, Micheál Martin TD names the two Naval Service Inshore Patrol Vessels (IPVs)". gov.ie. Department of Defence. 5 April 2024. Retrieved 14 April 2024.
  9. ^ "Tánaiste names two navy ships LÉ Aoibhinn and LÉ Gobnait". rte.ie. RTÉ News. 5 April 2024. Retrieved 5 April 2024.
  10. ^ a b c "Two inshore patrol vessels commissioned in Haulbowline". RTÉ News. 4 September 2024.
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