Type 23 frigate

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HMS Sutherland (F81) MoD.jpg
HMS Sutherland in December 2012
Class overview
NameType 23 frigate
BuildersYarrow Shipbuilders and Swan Hunter
Preceded byType 22 frigate
Succeeded by
Cost£130 million per ship
In commission24 November 1987
Active12 Royal Navy, 3 Chilean Navy
General characteristics
TypeAnti-submarine warfare frigate
Displacement4,900 t (4,800 long tons)[1]
Length133.0 m (436 ft 4 in)
Beam16.1 m (52 ft 10 in)
Draught7.3 m (23 ft 11 in)
SpeedIn excess of 28 knots (52 km/h; 32 mph) HMS Sutherland achieved 34.4 knots (63.7 km/h; 39.6 mph) during high-speed trials in November 2008
Range7,500 nmi (14,000 km; 9,000 mi) at 15 kn (28 km/h; 17 mph)
Boats & landing
craft carried
2 × Pacific 24 RIBs
Complement185 (accommodation for up to 205)
Electronic warfare
& decoys
Aircraft carried
  • 1 × Wildcat HMA2, armed with:
  • 2 × anti-submarine torpedoes (Martlet and Sea Venom ASM to be fitted in 2021/22)
  • or
  • 1 × Westland Merlin HM2, armed with;
  • 4 × anti-submarine torpedoes
Aviation facilities

The Type 23 frigate or Duke class is a class of frigates built for the United Kingdom's Royal Navy. The ships are named after British Dukes, thus leading to the class being commonly known as the Duke class. The first Type 23, HMS Norfolk, was commissioned in 1989, and the sixteenth, HMS St Albans was commissioned in June 2002. They form the core of the Royal Navy's destroyer and frigate fleet and serve alongside the Type 45 destroyers. They were designed for anti-submarine warfare, but have been used for a range of uses.[3] Twelve Type 23 frigates remain in service with the Royal Navy, with three vessels having been sold to the Chilean Navy, and one being retired in 2021.

The Royal Navy's current Type 23 frigates are currently being phased out starting in 2021 and later replaced by the Type 26 Global Combat Ship and the Type 31 frigate.[4] As of 2012 it is planned that HMS St Albans will be the last to retire from the Royal Navy, in 2036.[5][6]


When first conceived in the late 1970s, the Type 23 was intended to be a light anti-submarine frigate to counter Soviet nuclear submarines operating in the North Atlantic. The Type 23 would be replacing the Leander-class frigates (which had entered service in the 1960s) and the Type 21 frigate (a general purpose design that had recently entered service) as "the backbone of the Royal Navy's surface ship anti-submarine force". Although not intended to replace the Type 22 frigate, reductions in the size of the Navy due to the 1998 Strategic Defence Review led to HMS St Albans replacing HMS Coventry, a Type 22 frigate.[7]

Overhead view of HMS Richmond in August 2013

The ships were intended to carry a towed array sonar to detect Soviet submarines in the North Atlantic and carry a Westland Lynx or EHI Merlin helicopter to attack them.[8] It was initially proposed that the frigates would not mount defensive armament. Instead the Sea Wolf missile system was to be carried by Fort Victoria-class replenishment oilers, one of which was to support typically four Type 23s.[citation needed] The Fort-class oilers would also provide servicing facilities for the force's helicopters; the Type 23 would have facilities only for rearming and refuelling them.

As a result of lessons learned from the Falklands War, the design grew in size and complexity to encompass the Vertical Launch (VLS) Sea Wolf system with an extra tracking system as a defence against low-flying aircraft and sea-skimming anti-ship missiles such as Exocet.[8] With the addition of Harpoon surface-to-surface missiles and a medium calibre gun for naval gunfire support, the Type 23 had evolved into a more complex and balanced vessel optimised for general warfare, which introduced a host of new technologies and concepts to the Royal Navy. These included extensive radar cross-section reduction design measures, automation to substantially reduce crew size, a combined diesel-electric and gas (CODLAG) propulsion system providing very quiet running for anti-submarine operations along with excellent range, vertical launch missile technology and a fully distributed combat management system.

The Vertical Launch Sea Wolf surface-to-air missile system was designed for and first deployed on the Type 23. Unlike conventional Sea Wolf, the missile is boosted vertically until it clears the ship's superstructure, and then turns to fly directly to the target. Consequently, the ship's structure does not impose no-fire directions that would delay or inhibit missile firing in a conventionally launched system.

Although the Type 23 is officially the "Duke" class, and includes such famous names as HMS Iron Duke (which had been the name of the battleship HMS Iron Duke, Admiral Jellicoe's flagship at the Battle of Jutland), five of the names had previously been used on classes known as the "County class": Kent and Norfolk were names given both to 1960s guided missile destroyers and Second World War-era County-class heavy cruisers, while Monmouth, Lancaster, Kent and Argyll revived names carried by First World War-era Monmouth-class armoured cruisers. This use of Ducal and County names broke a tradition of alphabetical names for escort ships which had run in two – not unbroken – cycles from the L-class destroyers of 1913 to the Daring-class destroyers of 1950; this progression was revived with the Amazon-class Type 21 frigates of 1972–1975, and continued with B and C names for most of the Type 22 frigates of 1976–1989. However, the D names have since been used for the new Type 45 Daring-class destroyers, the first of which entered service in 2009.

It was reported in 1998 to the House of Commons that: "Type 23 frigates achieved approximately 85–89 per cent average availability for operational service in each of the last five years with the exception of 1996 when the figure dropped to just over 80 per cent due to a number of ships experiencing a particular defect. This discounts time spent in planned maintenance."[9]

Unlike the Type 45 destroyer, the "Type 23 frigate does not have the capability or configuration to act as flagship and is not tasked in this way."[10]

Programme costs[edit]

Prior to the Falklands War the cost of the Type 23 frigates was estimated at £75 million each (September 1980 prices)[11] Changes following the experiences in the Falklands, including improved damage control and fire precautions,[12] led to an increased cost estimated at £110 million (1984–85 prices)[11] By 2001, the Ministry of Defence said the cost of HMS Norfolk was £135.449 million and the remaining ships would have a final cost between £60 million and £96 million each. The Ministry of Defence said in 1998 that the Merlin ASW helicopter was costing them £97M each (this was for an order for 44 airframes), and that this was 57% of the cost of Type 23.[13] From this it can be calculated that the cost of Type 23 was £170.1M each. The Government's declared policy for construction contracts for Type 23 was "...competition, the aim being to secure best value for money for the defence budget." while maintaining "sufficient warship-building capacity to meet likely future defence requirements and a competitive base"[14]

HMS Norfolk was the first of the class to enter service, commissioned into the Fleet on 1 June 1990 at a cost of £135.449 million GBP, later vessels cost £60–96 million GBP.[15]

Upgrades and future technologies[edit]

The Type 23's propeller is specially designed to reduce underwater noise during anti-submarine operations.
Type 997 Artisan 3D radar on HMS Argyll following her 2010 refit

Mid-life refit[edit]

The class underwent[when?] mid-life refits which lasted 12–18 months and cost £15-20m. Aside from refurbishment of the mess decks and drive train, the ships are being fitted with a transom flap which can add up to one knot (1.9 km/h; 1.2 mph) to the top speed[16] and reduce fuel consumption by 13%, and Intersleek anti-fouling paint which added two knots (3.7 km/h; 2.3 mph) to the top speed of Ark Royal.[17] Although the top speed of the Duke class is commonly quoted as 28 knots, the caption of an official Navy photo suggests that Lancaster was capable of 32 knots even before her mid-life refit.[18][19] The Sea Wolf Mid Life Update (SWMLU) improves the sensors and guidance of the missiles, point defences are further improved with new remotely operated 30 mm guns, and Mod 1 of the Mk8 main gun has an all-electric loading system and a smaller radar cross-section. The communications and command systems are also upgraded.

A further refit is expected, with HMS Argyll being the first to receive this Life Extension (LIFEX) Upkeep. Amongst the upgrades will be the replacement of the Sea Wolf missiles with the new Sea Ceptor anti-air defence missiles;[20] these were first test-fired from HMS Argyll on 4 September 2017.[21]

Sonar 2087[edit]

Sonar 2087 is described by its manufacturer as "a towed-array system that enables Type 23 frigates to hunt the latest submarines at considerable distances and locate them beyond the range at which they [submarines] can launch an attack."[22] Sonar 2087 was fitted to eight Type 23 frigates in mid-life refits between 2004 and 2012; the five oldest Type 23 frigates, HMS Montrose, Monmouth, Iron Duke, Lancaster and Argyll are not scheduled to receive Sonar 2087. These ships will instead continue to be employed across the normal range of standing Royal Navy deployments. The Chilean Navy is procuring a number of Sonar 2087 towed arrays from Thales Underwater Systems to equip its multipurpose frigates.[23]

Artisan 3D radar[edit]

The Type 23's medium-range radar will be replaced by BAE Systems Insyte Type 997 Artisan 3D radar. It is a medium-range radar designed to be extremely modular and highly configurable to provide a cost-effective high-performance radar, capable of operating effectively in littoral zones and improving air-defence, anti-surface (anti-ship) and air traffic management capabilities of the Type 23 frigates. Protection measures are also added to maintain detection ranges even when attacked by complex jammers.[24][25] HMS Iron Duke is the first Type 23 frigate to have received the Type 997 Artisan 3D radar during her refit in 2012–13.[26] It will be fitted to all T23's as well as the assault platforms (LPD) – HMS Albion and HMS Bulwark, the Helicopter Platform (LPH) – HMS Ocean and the two Queen Elizabeth-class aircraft carriers are also planned to be equipped with the same radar. The project was worth £100 million and the contract was announced on 4 August 2008.[27]

HMS Iron Duke received her new Type 997 Artisan 3D radar in 2013. It is claimed the radar is five times more capable than the Type 996 radar it replaces.[28][29]

Common Anti-Air Modular Missile[edit]

CAMM(M), the maritime variant of the Common Anti-Air Modular Missile, is intended to replace the Sea Wolf missiles on the Type 23 frigates starting from 2016. CAMM(M) has a longer range of 1–25+ km compared to the 1–10 km offered by the Sea Wolf missile. An option exists to give the missile a surface-attack capability, though it is currently understood the Royal Navy will not take that option, because of cost.[30] Like Sea Wolf, CAMM(M) will be VLS launched; however due to its design, CAMM(M) can be packed much more tightly into the VLS, with up to four CAMM(M) fitting into the space occupied by one Sea Wolf missile.[31] CAMM(M) is known as Sea Ceptor in Royal Navy service.

Martlet Lightweight Multirole Missile[edit]

On an unspecified date in early 2019, HMS Sutherland tested a modified mounting for the 30mm cannon which incorporated a launcher for five 'Martlet' Lightweight Multirole Missiles, by firing four of them at a small speedboat target at the Aberporth range in Wales. The concept of mounting the missile alongside the 30mm Bushmaster cannon was tested just 5 months after the idea's conception.

The intended role of the Martlet is to further extend the Type 23's capabilities against small, fast moving targets beyond the current 30mm, GPMG and Minigun options to provide a long range 'stand-off' ability. It is not yet clear whether the Royal Navy intends to equip any more Type 23s with the system.[32]

Anti-ship missile[edit]

A replacement for the ageing Harpoon anti-ship missiles is being studied as an interim measure until the Future Cruise/Anti-Ship Weapon (FC/ASW) joint programme between the UK and France is completed in the 2030s.[33][34][35] The interim replacement missile is planned to be fitted as a stopgap to five of the newer Type-23 frigates as the Harpoon's out-of-service date (OSD) is in 2023.[36][37]

Weapons, countermeasures, capabilities and sensors[edit]

HMS Montrose firing a Sea Wolf missile
HMS Richmond firing a Harpoon anti-ship missile
HMS Northumberland fires her 4.5-inch Mark 8 naval gun
Anti-air warfare
  • Type 997 Artisan 3D radar installed/being installed on 12 of 13 vessels replacing previous Type 996 Mod 1, 3D surveillance and target indication radar.
  • 12 of 13 frigates are being upgraded with 32-cell Sea Ceptor GWS.35 VLS canisters[38] (range of over 25 kilometres, 16 mi) as replacement for previous Sea Wolf SAM. HMS Argyll was the first ship to receive Sea Ceptor, completing refit in February 2017.[39] As of 2021 in addition to Argyll, Westminster, Montrose, Northumberland, Kent, Lancaster, Richmond and Portland have all received Sea Ceptor systems. Somerset is scheduled to return to service with Sea Ceptor during 2021, while the refits of Iron Duke and St Albans are underway. Sutherland will be the final frigate to receive the upgrade starting in April 2021.[40][41] The 2021 defence white paper announced that Monmouth will not receive the upgrade and, together with Montrose, would be retired early.[42] Monmouth was formally withdrawn from service in June 2021.
Anti-ship warfare
Anti-submarine warfare
  • The Seagnat decoy system allows for the seduction and distraction of radar guided weapons, through active and passive means.
  • Type 182 towed torpedo decoys.
  • Type 2070 towed torpedo decoy system.
  • Thales defence Scorpion Electronic Counter Measures/UAF-1 ESM Jammer. Used to confuse or block enemy radar making the Type 23 frigate harder to detect and or locked onto by enemy radar/sonar guided weapons.
Electronic systems
Additional capabilities
  • The Type 23 frigates have sufficient space to embark a small detachment of Royal Marines and their equipment.


HMS Westminster moored at South Quay in London

On 21 July 2004, in the Delivering Security in a Changing World review of defence spending, Defence Secretary Geoff Hoon announced that Norfolk, Marlborough and Grafton were to be paid off. In 2005 it was announced that these three vessels would be sold to the Chilean Navy, to be delivered in 2008. In September 2005 BAE Systems was awarded a £134 million GBP contract to prepare the frigates for transfer. ex-Marlborough, ex-Norfolk and ex-Grafton were sold to Chile for a total of £134 million. The letter of intent for purchase was signed in December 2004, followed by a formal contract on 7 September 2005.[45] ex-Norfolk was handed over by the Defence Logistics Organisation and BAE Systems and commissioned into the Chilean Navy on 22 November 2006, and named Almirante Cochrane (FF-05) (after Lord Cochrane, a naval hero to both the British and Chileans). Ex-Grafton was delivered to Chilean Navy on 28 March 2007 at Portsmouth and renamed Almirante Lynch (FF-07). Ex-Marlborough was delivered to Chilean Navy on 28 May 2008 at Portsmouth and renamed Almirante Condell (FF-06).[citation needed] As of 2021, these three ships remain in service with the Chilean Navy and are being upgraded by Lockheed Martin Canada by the local ASMAR shipbuilding company.[46]

The five oldest ships in Royal Navy service are classified as General Purpose ships, and are primarily homeported at Portsmouth. The remainder are equipped with the Type 2087 Towed Array Sonar, and are primarily tasked with the anti-submarine warfare mission. These eight ships are based primarily at Devonport.[47] The Type 23 ships in the Royal Navy are due to be replaced in service by the Type 26 ASW and Type 31 general purpose frigates.[48] The 2021 defence white paper indicated that both Montrose and Monmouth are being retired early, with Monmouth actually withdrawn from service in June 2021.[42] Thereafter, the oldest remaining Type 23, HMS Argyll, is due to be decommissioned in 2023, with approximately one ship per year decommissioned after that.[41]

Name Pennant No. Type Builder Laid down Launched Commissioned Mid-life upgrade Status
 Royal Navy
Norfolk F230 Marconi Marine (YSL), Scotstoun 14 December 1985[49] 10 July 1987[49] 1 June 1990[49] N/A To Chile as Almirante Cochrane
Marlborough F233 Swan Hunter, Wallsend 22 October 1987[49] 21 January 1989[49] 14 June 1991[49] N/A To Chile as Almirante Condell
Argyll F231 GP Marconi Marine (YSL), Scotstoun 20 March 1987[49] 8 April 1989[49] 31 May 1991[49] Jun 2015 to Feb 2017[41] In active service[50]
Lancaster F229 GP Marconi Marine (YSL), Scotstoun 18 December 1987[49] 24 May 1990[49] 1 May 1992[51] March 2017 – December 2019[41] In active service[50]
Iron Duke F234 GP Marconi Marine (YSL), Scotstoun 12 December 1988[49] 2 March 1991[49] 20 May 1993[49] From January 2019[41] In active service[50]
Monmouth F235 GP Marconi Marine (YSL), Scotstoun 1 June 1989[49] 23 November 1991[49] 24 September 1993[49] Early decommissioning[41] Withdrawn from service June 2021
Montrose F236 GP Marconi Marine (YSL), Scotstoun 1 November 1989[49] 31 July 1992[49] 2 June 1994[51] October 2014 – July 2017[41] In active service[50]
Westminster F237 ASW Swan Hunter, Wallsend 18 January 1991[49] 4 February 1992[51] 13 May 1994[49] November 2014 – January 2017[41] In active service[50]
Northumberland F238 ASW Swan Hunter, Wallsend 4 April 1991[49] 4 April 1992[49] 29 November 1994[51] May 2016 – May 2018[41] In active service[50]
Richmond F239 ASW Swan Hunter, Wallsend 16 February 1992[51] 6 April 1993[49] 22 June 1995[51] August 2017 – February 2020[41] In active service[50]
Somerset F82 ASW Marconi Marine (YSL), Scotstoun 12 October 1992[49] 25 June 1994[49] 20 September 1996[51] From November 2018[41] In active service[50]
Grafton F80 Marconi Marine (YSL), Scotstoun 13 May 1993[49] 5 November 1994[49] 29 May 1997[49] N/A To Chile as Almirante Lynch
Sutherland F81 ASW Marconi Marine (YSL), Scotstoun 14 October 1993[49] 9 March 1996[49] 4 July 1997[51] From December 2020[41] In active service[50]
Kent F78 ASW Marconi Marine (YSL), Scotstoun 16 April 1997[51] 27 May 1998[51] 8 June 2000[51] January 2017 – August 2018[41] In active service[50]
Portland F79 ASW Marconi Marine (YSL), Scotstoun 14 January 1998[51] 15 May 1999[51] 3 May 2001[51] February 2018 – March 2021[41] In active service[50]
St Albans F83 ASW Marconi Marine (YSL), Scotstoun 18 April 1999[51] 6 May 2000[51] 6 June 2002[51] From July 2019[41] In active service[50]
 Chilean Navy
Almirante Cochrane FF05 ASW Marconi Marine (YSL), Scotstoun 14 December 1985[49] 10 July 1987[49] 22 November 2006 N/A In active service
Almirante Condell FF06 ASW Swan Hunter, Wallsend 22 October 1987[49] 21 January 1989[49] 28 May 2008 N/A In active service
Almirante Lynch FF07 ASW Marconi Marine (YSL), Scotstoun 13 May 1993[49] 5 November 1994[49] 28 March 2007 N/A In active service

In fiction[edit]

See also[edit]


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    HMS Sheffield 2012 – to be superseded by a T45 Destroyer
    HMS Coventry 2001 – to be superseded by HMS St. Albans, a T23 Frigate.
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External links[edit]