Kolkata-class destroyer

Design

The Kolkata class share similar dimensions to the previous Delhi class, however they have 2,363 modifications which include major upgrades in weaponry, sensors and helicopter systems. With a standard displacement of 6800 t and a full-load displacement of 7400 t, they are the largest destroyers ever operated by the Indian Navy. Some media reports have even given a full-load displacement of 7500 t. These are the first stealth destroyers built by India and marked a significant development in India's shipbuilding technology. The ships incorporate modern weapons and sensors, and have an advanced information warfare suite, an auxiliary control system with a sophisticated power distribution architecture, and modular crew quarters.

The class have a length of 163 m, a beam of 17.4 m and a draught of 6.5 m. The ship's power and propulsion features a combined gas and gas system utilizing four DT-59 reversible gas turbines. This configuration allows the ship to reach speeds in excess of 30 kn. Aviation facilities include a large flight deck, which was re-designed to handle larger helicopters than the Delhi class, and an enclosed hangar for up to two maritime helicopters.

The primary radar sensor of the class is the EL/M-2248 MF-STAR multi-mission AESA.

The ship's main air-defence armament is composed of four eight-cell vertical launching systems (VLS) allowing for up to thirty-two Barak 8 / MRSAM air defence missiles.

The class is designed for network-centric warfare such as Cooperative Engagement Capability, where they operate wide-area air defense, distributing assets and control over different platforms and locations, and harnessing multiple sensors & effectors into a single air defense system. In May 2019, 2 ships of the class conducted the maiden cooperative engagement firing of the Barak 8 / MRSAM by using the Joint Taskforce Coordination (JTC) mode to intercept several simultaneous aerial targets involving two complex scenarios at extended ranges. With it, the Indian Navy became the second naval service in the world after the United States, and the first in Asia to have developed and deployed it. The capability is to be rolled out on all future major warships of the Indian Navy.

Four AK-630 CIWSs are fitted for close-in defence.

The supersonic BrahMos anti-ship and land-attack missiles are the primary offensive armament of the Kolkata class. The BrahMos missiles are fitted into a 16-cell Universal Vertical Launcher Module (UVLM) allowing one missile per launch silo, and all 16 missiles can be fired in salvo.

The class carries a 76 mm naval gun located forward of the bridge, which provides limited anti-shipping capability and anti-air capability in addition to its naval gun fire-support role for land-based operations.

A bow-mounted sonar HUMSA-NG (hull-mounted sonar array – new generation) is carried for sub-surface surveillance.

For anti-submarine warfare, the Kolkata class are equipped with a torpedo launching system via four torpedo tubes and two RBU-6000 anti-submarine rocket launchers.

BEL's Electronic Modular Command & Control Applications (EMCCA) Mk4 provides combat management.

Forty lakh (four million) lines of codes have been written to develop the advanced combat management system onboard INS Kochi. The system is designed so that all the data about the surrounding threat comes in one place, along with analysis of the kind of threat. The system also advises the commanding officer about the kind of weaponry he should use to tackle the threat in real time. The ship is equipped with sophisticated digital networks, such as Asynchronous Transfer Mode based Integrated Ship Data Network (AISDN), Combat Management System (CMS), Automatic Power Management System (APMS) and Auxiliary Control System (ACS). The AISDN is the information highway on which data from all the sensors and weapon ride. The CMS is used to integrate information from other platforms using an indigenous data-link system to provide Maritime Domain Awareness. The intricate power supply management is done using APMS, and remote control and monitoring of machinery is achieved through the ACS.

Development

In 1986, the Cabinet Committee on Political Affairs (CCPA) approved a follow-on class of the earlier Project 15 Delhi-class destroyers. The aim was that the follow-on class would incorporate a higher level of air-defence, land attack, anti-submarine, and anti-ship capabilities than the preceding class. However, the Indian Navy did not initially take up the option. By the year 2000, the Indian Navy had redesigned the follow-on Kolkata class to incorporate even higher levels of technology (including modern stealth characteristics) and in May of that year, approval for the construction was given. The concept and function for Project 15A was framed by the navy's Directorate of Naval Design, while the detailed design was developed by Mazagon Dock Limited (MDL).

Initially in 2008, the total program cost with long-term spare parts was expected to cost , but the construction costs escalated about 225%, and by 2011, cost of the program became , with each ship costing . The Defense Minister A. K. Antony cited the causes being the delay in supply of warship-grade steel by Russia, increase in costs of Russian specialists due to inflation during the build period, wage revision due from October 2003 and delay in finalisation of cost of weapons and sensors. A Comptroller and Auditor General of India report published in 2010 blamed the Navy for delays, criticising the late decisions for replacement of surface to air missile system with Barak, change of gun mount, inclusion of a sonar dome and modification of helicopter hangar to accommodate HAL Dhruv.

Construction

Construction of three Kolkata-class ships was sanctioned by the Government of India in May 2000, and steel for the lead ship was cut in March 2003. Construction began in September 2003 at Mazagon Docks, Mumbai, with an initial expectation that the first of the class would be handed over to the navy by 2010. However, since then the Kolkata class has suffered consecutive delays, slow construction procedures, and technical problems, which saw the first ship of the class enter service during mid-2014. The delays in the construction programme have been attributed to persistent design changes made by the Indian Navy to incorporate new weapons systems and sensors, failure by a Ukrainian shipyard to deliver the ship's propellers and shafts, and the contract later being awarded to a Russian firm, and finally the delay in the delivery of the Barak 8 anti-air missiles.

The Kolkata class are the largest destroyers ever to be constructed at Mazagon Docks. Technical problems were found during the sea trials of the lead ship Kolkata, which delayed the project by six months to early 2014.

Ships of the class

Gallery

|File:IAC1 Vikrant (R11) with INS Kolkata (D63) during sea trial.jpg | with Vikrant (R11) during sea trial |File:INS Kolkata steams alongside the guided-missile destroyer USS Sterett (DDG 104) during Malabar 2020.jpg | alongside during Exercise Malabar 2020. |File:INS Chennai (D65) with JMSDF JS Kaga during JIMEX2020.jpg | with during JIMEX 2020. |File:INS Kolkata at Mombasa, Kenya.jpg |INS Kolkata at Mombasa, Kenya. |File:The Indian Navy destroyer INS Kolkata (D63) and the British Navy destroyer HMS Defender (D36) steam alongside the Ticonderoga-class guided-missile cruiser USS Antietam (CG 54) during an exercise.JPG |INS Kolkata and during an exercise. |File:INS Chennai (D65) with JS Ikazuchi during JIMEX2020.jpg |INS Chennai with . |File:INS Chennai steams alongside the USS Princeton (CG 59) in the North Arabian Sea during Malabar 2020.jpg |INS Chennai during Malabar 2020. |File:INS Chennai (D65) with JS Ikazuchi (DD-107) during JIMEX 2020.jpg |INS Chennai and JS Ikazuchi during JIMEX 2020. |File:INS Kochi 7th Anniversary Img1.jpg |INS Kochi.

References

References

1. (13 July 2014). "Navy gets its largest destroyer". The Hindu.
2. "INS Kolkata". Indian Navy.
3. "INS Kolkata: embarquement immédiat". l'express.
4. (5 October 2015). "INS Kochi turbocharged". The Financial Express.
5. (18 August 2014). "India commissions first-of-class destroyer Kolkata". IHS Jane's Navy International.
6. (8 June 2014). "Country's most potent indigenous warship joins service this month". SP's Naval Forces.
7. (2 July 2008). "Bharat Electronics Ltd. awards LW08 contract to Thales". Thalesgroup.com.
8. "Virtual tour of INS Kolkata (Hindi)".
9. "Kolkata Class Destroyer INS Chennai will be commissioned on Monday".
10. (29 September 2015). "Inside India's New and Deadliest Warship".
11. (10 June 2013). "Navy's ongoing hunt for heavy torpedoes leads to delay in modernisation process". India Today.
12. (21 November 2016). "Guided Missile Destroyer INS Chennai Joins the Indian Navy". Indian Navy.
13. (2012). "Strategy in the second nuclear age : power, ambition, and the ultimate weapon". Georgetown University Press.
14. "Press Information Bureau".
15. (17 May 2019). "Indian Navy Demonstrates 'MRSAM 'Cooperative Engagement' Capability".
16. (20 May 2019). "Indian Navy completes MRSAM first cooperative engagement firing test – Naval News".
17. "Janes | Latest defence and security news".
18. (20 August 2012). "Dangerous consequences of warships built in India". Rediff News.
19. (1 April 2010). "INS Chennai adds to Naval might". Zee News.
20. "Project 15-A destroyer, INS Kochi To be launched on 18 Sep 2009". PIB.
21. Philip, Snehesh Alex. (2025-09-11). "Navy gets first Tata-made Spanish 3D surveillance radar for its warships, 19 more to come".
22. (16 August 2014). "On INS Kolkata, PM is Only Partially Correct".
23. (5 March 2008). "First test of BrahMos land-attack variant from the sea". India today.
24. (9 June 2014). "BrahMos missile test-fired from warship INS Kolkata". The Times of India.
25. "Project 15-A Improved Delhi / VIshakhapattanam / DDGHM Kolkata". Global Security.
26. "INS Kochi is proof India good at integrating different systems on one platform". sunday guardian.
27. "INS Kochi commissioned at Mumbai {{!}} Indian Navy".
28. [http://www.globalsecurity.org/military/world/india/d-project-15a.htm Kolkata-class destroyer] {{webarchive. link. (4 April 2013 GlobalSecurity.org)
29. Shukla, Ajai. (15 April 2008). "World-class warships at Indian prices". Business Standard.
30. Bhatt, Arunkumar. (27 September 2003). "Mazagon Dock lays keel of destroyer". [[The Hindu]].
31. "Mazagon Dock Annual Report". Mdlindia.com.
32. Ajai Shukla. (2 May 2014). "INS Kolkata, navy's most powerful warship, to be delivered next month". Business-standard.
33. (5 September 2011). "Indian warships' costs escalate over 225%". StratPost.
34. (3 August 2011). "Delay in Indigenous Warship Projects of Navy". Press Information Bureau.
35. "Report No. 32 of 2010 – Performance Audit of Indigenous Construction of Indian Naval Warships". Comptroller and Auditor General of India.
36. Shukla, Ajai. (1 April 2009). "Russia steps in to bail out sinking Project 15-A". Business Standard.
37. Shukla, Ajai. (20 August 2012). "Navy's wavering delaying warships by years". Business Standard.
38. (1 April 2010). "India's 3rd indigenous naval destroyer launched". CNN-News18.
39. "Annual Report 2014–2015". Mazagon Dock Shipbuilders Limited.
40. (27 September 2003). "Mazagon Dock lays keel of destroyer". [[The Hindu]].
41. (1 April 2006). "Queen of the high seas". The Times of India.
42. Bhatt, Arunkumar. (1 April 2006). "A lethal combination of stealth and strength". The Hindu.
43. (16 August 2014). "PM Modi inducts India's largest indigenously built warship INS Kolkata". The Times of India.
44. Ved, Mahendra. (8 October 2015). "Make in India at Indian Navy". The Hans India.
45. (30 September 2015). "INS Kochi, largest India-made warship, commissioned". The Times of India.
46. "Annual Report 2016–2017". Mazagon Dock Shipbuilders Limited.
47. (2016). "Jane's Fighting Ships 2016–2017". Jane's Information Group.