S-80 Plus-class Isaac Peral (S-81)
Class overview
BuildersNavantia
Operators Spanish Navy
Preceded byScorpène class
Cost
Built2005–2028 (planned)
In commission2023-present
Planned4
Building3
Completed1
Active1
General characteristics
TypeSubmarine with air-independent propulsion (AIP)
Displacement2,965 t (2,918 long tons) submerged[2]
Length81.05 m (265 ft 11 in)
Beam11.68 m (38 ft 4 in)
Draught7.3 m (23 ft 11 in)
Propulsion
  • 1 shaft Etanol-AIP
  • 3 bio-ethanol engines (3 × 1,200 kW) MTU-16V-396SE-85L
  • 1 electric motor (3,500 kW), 1 AIP fuel cell unit (300 kW)
  • Vulkan couplings RATO-S G-561W. 280 kN·m [3]
Speed
  • 12 knots (22 km/h; 14 mph) surfaced
  • 19 knots (35 km/h; 22 mph) submerged
Range8,000 km (5,000 mi)
Endurance30-55 days in immersion
Test depth460 m (1,510 ft)
Complement32 (plus 8 troops)
Armament6 × 533 mm (21.0 in) torpedo tubes with DM2A4 torpedoes and Harpoon missiles UGM-84 Sub-Harpoon block II.
NotesAIP reactor autonomy: 28 days

The S-80 Plus class (or Isaac Peral class) is a Spanish class of four submarines being built by the state-owned[4] Spanish company Navantia at its Cartagena shipyard for the Spanish Navy. In common with other contemporary submarines, they feature air-independent propulsion.

The class has its roots in the late 1990s, and Spain ordered the submarines into production in 2003. Due to problems with the design, it had to be extensively redesigned in the 2010s, and a Spanish government budget crisis forced additional delays. The submarines are as of 2023 slated to begin entering service in the same year. On November 30, 2023, the first submarine of the class entered service with the Spanish Navy

They are oceanic submarines of medium tonnage with the capacity to carry out long duration missions in scenarios far from their base, acting with a minimum level of indiscretion.[clarification needed] They will have an integrated platform control system that allows operation with a reduced endowment[clarification needed] and a high degree of automation with remote control. The characteristics of this class of ships place them at a level close to those of nuclear propulsion.

The lead boat in the class, the Isaac Peral [es], the first unit in the series, was launched by King Felipe VI and his daughter, Princess Leonor, heir to the throne, on 22 April 2021 at the Cartagena shipyards, entered to service in 2023, after originally being targeted for 2011. The remaining three boats are slated to be delivered in 2024, 2026 and 2028. The S-80 class has also been offered for export.

History

Submarine Mistral (S-73) of the Agosta-class submarine (S-70). It was in service until 2020. Galerna (S-71) and Tramontana (S-74) are still active.

In the 1980s France began studies for the replacement of their S-60 Daphné-class diesel submarines. The French shipyard DCNI (Direction des Constructions Navales International) came up with an all-new design called S-80, with a teardrop hull and new weapons and sensors, which the French government ultimately decided[when?] not to fund.[5] DCNI then proposed a cheaper option called the S-90B, an S-70 Agosta-class submarine with limited improvements which was again rejected by the French but which was exported to Pakistan.[5] Meanwhile, Spain faced the same problem in replacing their Daphnés, known as the Delfín class in Spanish service, as part of Plan ALTAMAR. The firm Bazán (later Izar, and then subsequently, the Spanish state-owned Navantia[4]) started on a new design but when it started to look like the S-80, it was agreed to collaborate in a joint venture[clarification needed] based on the French S-80.[5] This joint design was shown at Euronaval [fr] in October 1990.[5]

The end of the Cold War meant that funding dried up and the joint venture had to wait until 1997 for their first sale - to Chile - of the new design,[6] which was designated the Scorpène class in export markets. The same year Spain started to look again at its requirements, and in 1998 they indicated that they would buy four Scorpènes,[5] optionally with an air-independent propulsion (AIP) system for greater endurance when submerged. A staff requirement for the S-80 Scorpène variant was completed in October 2001.[7] This was soon overtaken by events, as the Armada (navy) became more interested in using submarines for power projection than in a more static, defensive role.[7] This shift was codified in guidance of January 2002 from the Chief of Naval Operations and in the strategic defence review of February 2003.[7] The new requirement called for a larger submarine with better endurance and land-attack missiles, which became known as the S-80A design. This was an AIP submarine with a hull diameter of 7.3 metres (23 ft 11 in) compared to 6.2 metres (20 ft 4 in) for the Scorpène family, a submerged displacement of around 2,990 tonnes versus 1,740 tonnes, larger rudder surfaces and a different fin position.[7]

The Spanish government approved the purchase of four S-80A submarines in September 2003 and signed a contract with Izar on 24 March 2004.[8] The original deal was €1,756m to design and build four submarines,[8] about €439m per boat, but by 2010 this had increased to €2,212m[9] (€553 m/boat). The plan envisaged the first boat to be delivered in 2011 but government dithering over who should supply the combat system pushed it back to 2013.[7] In 2011 Spain's budget crisis further delayed the first delivery until 2015, with the remaining boats being delivered at one year intervals until 2018.[10] Construction of S-81 began on 13 December 2007.[11] In January 2012 the names were announced, honouring three engineers who made submarines and the first commander of Spain's submarine force respectively - Isaac Peral (S-81), Narciso Monturiol (S-82),[12] Cosme García (S-83) and Mateo García de los Reyes (S-84).[13]

By May 2013, with over US$680 million of the project's US$3 billion budget for the four submarines spent, an overweight issue was discovered and eventually made public. Navantia engineers had miscalculated the weight of the submarines by some 100 t (98 long tons; 110 short tons) of the total 2000 tonne mass of the submarines, more than enough to sink the submarines if not fixed.[14] As of 2013 Navantia announced the issue would delay the delivery of the first submarine to the Spanish Navy until at least 2017.[15] That date proved to be optimistic. Lengthening the submarine created additional buoyancy.[4] Navantia signed on the US company General Dynamics Electric Boat to help solve the excess weight design issue.[16] In September 2014, the overweight issue was reported to have been resolved in design changes and the construction work to be ready to resume in late October 2014.[17][clarification needed] In November 2014, Navantia again reported having completed the redesign work to address the problem of overweight. In all, the hull would be lengthened by 10 metres (33 ft), and the displacement increased by 100 tons. As of January 2018, the intended delivery date of the first submarine was to be September 2022,[18] but this was not achieved. At the time of the boat's launch in 2021 it was indicated that the plan was for the first boat to start sea trials in 2022 and be delivered in 2023.[19] Isaac Peral started sea trials in mid-2022,[20] and completed its first static dive in March 2023.[21]

In January 2017, it was reported that the air-independent propulsion system would not be ready in time for the delivery of the first submarine.[22] In November 2018 Abengoa and Tecnicas Reunidas companies stated that the test for the revolutionary AIP engine of the submarine were a complete success.[23] The Indian Navy considered the S-80 for its next generation of submarines under Project-75 class- submarine.[24] On November 30, 2023, the first unit of the class, the S-81, entered service with the Spanish Navy.[25]

Combat systems

The Integrated Combat System Core (ICSC) is called VC 9.0 SCA.[26] The ICSC provides set of weapons and sensors of the combat system with an optimal management of the command and control center, allowing to acquire, evaluate and present all the necessary information for the offensive, defensive or intelligence gathering actions at each moment. The ship is fitted with active and passive sonars with accurate electromagnetic detection systems. The submarine can communicate via Link-11 and Link-22 data links.[26]

Propulsion

The S-80's air-independent propulsion (AIP) system is based on a bioethanol-processor consisting of a reaction chamber and several intermediate Coprox reactors. Provided by Hynergreen from Abengoa, the system transforms the bioethanol (BioEtOH) into high purity hydrogen. The output feeds a series of fuel cells from UTC Power company.

The reformator is fed with bioethanol as fuel and oxygen (stored as a liquid in a high pressure cryogenic tank), generating hydrogen and carbon dioxide as subproducts. The produced hydrogen and more oxygen is fed to the fuel cells.

The bioethanol-processor also produces a stream of highly concentrated carbon dioxide and other trace gases that are not burned completely during combustion. This gas flow is mixed with sea water in one or more ejector venturi scrubber and then through a new system, SECO2 (or CO2 Removal System), developed by Bionet, and whose purpose is to dissolve the "bubbles" of CO2 in water to undetectable levels.[27]

The oxygen and fuel flow rates are directly determined by the demand for power. The AIP power in the S-80 submarine is at least 300 kW (400 hp).[27] A permanent-magnet electric motor moves a fixed propeller of a special design, that doesn't create cavitations at high speed.

The engine leads to resonance effects, wherefore a highly flexible coupling the RATO-S G-561W from Vulkan is installed.[28]

In December 2020, the Spanish Ministry of Defence announced the development of a Spanish fuel cell due to the high cost of the current SPC and to avoid the dependence on a foreign manufacturer. The program has a 6-year horizon to develop a 300 kW prototype.[29]

Capabilities

S-80 Plus-class submarines are designed to improve threat scenario missions. Their operational mobility will allow them to operate in remote areas, traveling discreetly at high speeds. Their air-independent propulsion (AIP) system, of new technological design, will ensure their ability to remain in an area for a very long period of time without being detected and their ability to operate in possible conflict zones.[30]

Capabilities include:

Units

Italics indicate estimated dates

Pennant no. Name[31] Laid down Launched Delivered Commissioned Notes
S-81 Isaac Peral [es] 2005 7 May 2021[19] 2023[21] 30 November 2023 Operative[32][33][34]
S-82 Narciso Monturiol [es] 2007 Expected 2024[21]
S-83 Cosme García [es] 2009 Expected early 2026[21]
S-84 Mateo García de los Reyes [es] 2010 Expected mid-2027[21]

International bids

The Netherlands

The S-80 design was not accepted as a contender for the Walrus-class replacement program following an initial assessment & selection (B-letter) in 2019.[35] In 2022 the Spanish Ministry of Defence send a letter to the Dutch Defensie Materieel Organisatie [nl] for Navantia to be allowed to put in an offer following a RFQ sent to the remaining contenders, in which some of the requirements had changed. It is rumoured that the request was denied by DMO.[36]

India

Larsen & Toubro and Navantia signed a Teaming Agreement (TA) for the purpose of submission of a techno-commercial bid for the Project-75 (India) submarine acquisition project.[37][38] Spain has said that its submarine, in contention for a Rs 43,000 crore procurement order by the Indian Navy, has been declared technically compliant and will be ready for trials in a few months.[39]

Philippines

Navantia has confirmed to the press that it has pitched an offer to sell submarines and build a submarine base and training center for the Philippine Navy.[40][41] The submarine base specifically points to a location in Ormoc, Leyte.[42]

Poland

Navantia is participating in the “Orka” submarine procurement program being pursued by the Polish Navy.[43][44][45][46][47]

Turkey

Spain's Navantia has allegedly granted a license for the design of its S-80 Air-Independent Propulsion (AIP) submarines to Turkey.[48]

See also

References

This article incorporates material from Spanish Wikipedia

  1. ^ "Submarinos (VI): el S-80 tendrá capacidad para atacar con misiles objetivos en tierra". Por Tierra, Mar y Aire (in European Spanish). 4 January 2018. Retrieved 4 January 2018.
  2. ^ Carrasco, Benjamín (22 April 2021). "Así es el S-80, el primer submarino 100% español, solo comparable a una nave espacial". La Razón. Retrieved 8 August 2023.
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  32. ^ La Armada ya tiene el S-81 de Navantia, su primer submarino desde 1985 Infodefensa (30/11/2023)
  33. ^ La Armada española recibe el submarino S-81 ‘Isaac Peral’ Defensa.com (30 de noviembre de 2023)
  34. ^ La Armada española recibe el submarino S-81 ‘Isaac Peral’. Galaxia Militar (30 noviembre, 2023)
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  43. ^ "Polish "Orka" Submarine Procurement Gains Weight (and Bids)". defence24.com (in Polish). 8 August 2023. Retrieved 11 March 2024.
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  46. ^ https://www.defensenews.com/industry/2023/09/12/asian-european-players-compete-for-polish-submarine-order/
  47. ^ https://www.reuters.com/world/europe/poland-launch-submarine-purchase-programme-soon-minister-2023-05-24/
  48. ^ https://x.com/Defence_IDA/status/1723713891132387361?s=20
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