Alta-class minesweeper: Difference between revisions

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{{Short description|Norwegian class of minesweepers}}

{{refmore improvecitations needed|date=February 2013}}

{|{{Infobox ship begin}}

{{Infobox Shipship Imageimage

|Ship image= [[File:M352 River Clyde.jpg|300px|''Rauma'' (M352), a Royal Norwegian Navy Alta class minesweeper.]]

|Ship caption=Norwegian ''Alta''-class minesweeper ''Rauma'' (M352)

}}

{{Infobox Shipship Classclass Overviewoverview

|Name=''Alta'' class

|Builders=[[Kværner Mandal]], [[Mandal, Norway]]

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|Total ships completed=5

|Total ships cancelled=

|Total ships active=23

|Total ships laid up=

|Total ships lost=1

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|Total ships preserved=

}}

{{Infobox Shipship Characteristicscharacteristics

|Hide header=

|Header caption=<ref>{{Cite web

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|work=naval-technology.com

|accessdate=2 March 2010

| archiveurlarchive-url= httphttps://web.archive.org/web/20100317183207/http://www.naval-technology.com/projects/oksoy/| archivedatearchive-date= 17 March 2010 <!--DASHBot-->| deadurlurl-status= nolive}}</ref>

|Ship type=[[Minesweeper (ship)|Minesweeper]]

|Ship tonnage=

|Ship displacement= 375 tonnes<ref>{{Cite web |url=https://forsvaret.no/en/facts/equipment/oksoy-class-and-alta-class |title=Oksøy-class and Alta-class - Forsvaret.no |access-date=2017-05-22 |archive-date=2017-07-01 |archive-url=https://web.archive.org/web/20170701010324/https://forsvaret.no/en/facts/equipment/oksoy-class-and-alta-class |url-status=dead }}</ref>

|Ship displacement=

|Ship tons burthenlength= 55.2 metres

|Ship lengthbeam= 13.6 metres

|Ship beamheight= 21 metres

|Ship heightdraught= 2.5 metres

|Ship draught=

|Ship depth=

|Ship power=

|Ship propulsion=*2 × {{convert|2.7|MW|0|abbr=on}} MTU 12V 396 TE84 [[diesel engine]]s<br/>
*2 × Kværner [[Pump-jet|water jets]]

|Ship speed= {{convert|30|kn|lk=in}}

|Ship range={{convert|1500|mi|abbr=on}}

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|Ship boats=

|Ship capacity=

|Ship complement= 32

|Ship time to activate=

|Ship sensors=*[[Oropesa (minesweeping)|Oropesa mechanical sweep]]<br/>
*[[Kongsberg Defence & Aerospace]] (KDA) Agate (Air Gun and Transducer Equipment) acoustic minesweeping system<br/>
*Elma magnetic sweepers

|Ship EW=

|Ship armament=*1 × [[Mistral (missile)|Sadral surface-to-air missile system]]<br/>
*1 or 2 × [[Rheinmetall 20 mm]] AA guns<br/>
*2 × 12.7&nbsp; mm [[machine gun]]s

|Ship armour=

|Ship aircraft=

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}}

|}

The '''''Alta'' class''' is a [[ship class]] of [[minesweeper (ship)|minesweepers]] operated by the [[Royal Norwegian Navy]]. An almost identical class of [[minehunters]] is known as the {{sclass-|Oksøy|mine hunter|4}}.

==Design==

The ''Alta'' class was built by [[Kværner]] [[Mandal, Norway|Mandal]] during 1996 and 1997, while the related ''Oksøy'' class was built in 1994 and 1995. A total of 9nine vessels were built, 5five minesweepers and 4four minehunters. The [[catamaran]] hull is built in a [[Glass-reinforced plastic|fibre-reinforced plastic]] sandwich of very low magnetic signature.<ref>{{cite web |url=http://www.navyrecognition.com/index.php/news/defence-news/year-2013-news/september-2013-navy-world-naval-forces-maritime-industry-technology-news/1253-kongsberg-to-supply-minesniper-mk-iii-mine-disposal-weapon-system-to-royal-norwegian-navy-.html |title=Kongsberg to Supply MINESNIPER Mk III Mine Disposal Weapon System to Royal Norwegian Navy |date=September 20, 2013}}</ref>

Two large fans located on each side create an air cushion between the two hulls and a front and aft rubber skirt, lifting the vessel, giving small drag and a high cruise speed, as well as low susceptibility to the shock of exploding mines since only a small portion of the hull is actually exposed in the water. Propulsion by [[Pump-jet|water jet]], again one in each hull, gives a low acoustic signature. A degaussing system gives the vessels extremely low electromagnetic signature.{{cn|date=March 2015}}

==Ships==

{| class="wikitable"

|colspan=56 align=center|'''''Alta'' class'''<ref>{{cite book|title=Jane's Fighting Ships, 2004-2005 |publisher=Jane's Information Group |isbn=0710626231 |editor=Stephen Saunders |___location=London |pages=517 |date=2004}}</ref>

|-

! Number

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! Commissioned

! Status

|rowspan=6|[[File:Knm-orkla-burning-2002-11-19.jpg|thumb|KNM ''Orkla'' burning outside [[Ålesund]], Norway in November 2002]]

|-

|M350

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|rowspan=5|[[Kværner]], [[Mandal, Norway|Mandal]]

|12 January 1996

|Scrapped some time prior to 23 July 2022<ref>{{cite web |title=Scrapyard Ships |url=https://www.shipspotting.com/photos/gallery?category=70&imo=4907517 |website=shipspotting.com |accessdate=15 February 2023}}</ref>

|

|-

|M351

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|''Orkla''

|

|Destroyed by fire on 19 November 2002<ref name=orklaloss>{{cite news |author=<!--Staff writer(s); no by-line.--> |title=«"Orkla»" har kantret |url=http://www.ba.no/nyheter/article287927.ece |newspaper=[[Bergensavisen]] |___location= |date=26 January 2003 |access-date=29 March 2015 |language=Norwegianno }}</ref>

|-

|M354

|''Glomma''

|1 July 1997

|Sold 2009<ref>{{cite web |title=Sold warships |url=https://www.nettavisen.no/nyheter/forsvaret-solgte-krigsskip/2617355.html |website=nettavisen.no |accessdate=15 March 2020}}</ref>

|

|}

==Service history==

''Orkla'' was destroyed by fire on 19 November 2002.<ref name=orklaloss/> ''Glomma'' is no longer in active service.{{cn|date=March 2015}}Alta was scrapped along with the Oksøy class M341 Karmøy prior to 23 July 2022

==References==

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==External links==

*[http://www.naval-technology.com/projects/oksoy/ Oksøy and Alta class]

*[https://web.archive.org/web/20140201225714/http://www.altaclass.com/ Alta class]

*[https://www.globalsecurity.org/military/world/europe/knm-oksoy.htm Alta / Oksoy Surface Effect Ship (SES)]

{{Royal Norwegian Navy}}

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[[Category:Mine warfare vessel classes]]

[[Category:Minesweepers of the Royal Norwegian Navy]]

[[Category:Active minesweepersMinesweepers of Norway| ]]

{{Norway-mil-ship-stub}}