KRI Cakra (401)

Diesel-Electric Attack Submarine [ 1981 ]

KRI Cakra is the sole surviving member of her class, sister-ship KRI Nanggala being lost in 2021.

Authored By: Staff Writer | Last Edited: 07/21/2023 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Image from the Indonesian Navy; Public Release.

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KRI Cakra is a diesel-electric attack submarine serving the modern Indonesian Navy. She represents the lead (and only) ship of the aging Cakra-class, ordered on April 2nd, 1977 and laid down on November 25th of that same year. She was officially completed on March 18th, 1981. The Cakra's design is based in the West German Type 209/1300 approach and, therefore, completed by the shipbuilders of Howaldtswerke-Deutsche Werft. The class originally numbered two hulls though sister boat KRI Nanggala (402) was tragically lost with all hands on board around April 21st, 2021. The vessel was later found at its resting place on April 25th.

Design of KRI Cakra is conventional right down to her propulsion scheme which involves 4 x MTU 12V493 AZ60 GA31L diesel engines of 2,400 horsepower each with 4 x Siemens alternators of 2,300 horsepower each and a single Siemens motor of 4,600 horsepower. All this is used to drive a single shaft astern and propel the boat to submerged speeds of 21.5 knots and a surfaced speed of 11 knots out to a maximum range of 8,200 nautical miles (when cruising at 8 knots). The hull has been tested to depths of 790 feet.

Aboard is a complement of 34 encompassing eight officers and twenty-eight enlisted personnel. Onboard stores allow the vessel to remain as-sea for some 50 total days. Sensors and processing systems include surface-search radar, active-passive sonar, and the Signaal SINBAD Weapons Control System (WCS). A Thomson-CSF DR2000U suite fulfills the Electronic Warfare (EW) requirement.

Armament is centered on 8 x 533mm (21") torpedo tubes all fitted to the bow. Fourteen AEG SUT torpedo reloads are carried.

Once taken into service, the Cakra-class succeeded an aging line of Soviet Cold War-era Whiskey-class submarines in same role. The Cakra-class itself has since been succeeded, on paper, by the South Korean-originated Nagapasa-class boats currently number three hulls (403, 404, and 405). For its part, KRI Cakra continues to soldier on in service and saw a refit in the late-1980s and, again, in the early-to-mid-1990s. Yet another refit followed in 2004-2005 which further helped to modernize the type and keep its systems viable for the foreseeable future.©MilitaryFactory.com

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Specifications

Howaldtswerke-Deutsche Werft - West Germany
Shipbuilder(s)

Indonesia
Operators

1981
Commissioned

Indonesia
National Origin

Commissioned, Active
Project Status

34
Complement

Cakra-class (Type 209/1300)
Hull Class

2
Number-in-Class

KRI Cakra (401); KRI Nanggala (402)
Ships-in-Class

Submerged Attack
Traveling under the surface to search, track, and / or engage or reconnoiter areas.

Maritime Patrol
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.

Fleet Support
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.

195.2 feet
(59.50 meters)
Length

20.3 feet
(6.19 meters)
Beam

17.8 feet
(5.43 meters)
Draught

1,285
tons
Displacement

1,400
tons
Displacement (Submerged)

4 x MTU 12V493 AZ80 GA31L diesel engines developing 2,400 horsepower each with 4 x Siemens alternators delivering 2,300 horsepower each, and 1 x Siemens motor of 4,600 horsepower driving 1 x Shaft astern.
Propulsion

11.0 knots
(12.7 mph)
Surface Speed

21.5 knots
(24.7 mph)
Submerged Speed

8,168 nm
(9,400 miles | 15,128 km)
Range

1 knot = 1.15 mph; 1 nm = 1.15 mile; 1 nm = 1.85 km

8 x 533mm (21in) torpedo tubes in the bow (14 torpedo reloads).

None.

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Image from the Indonesian Navy; Public Release.

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