Ships / Submarines / Walrus class

Walrus class

General Facts

  • TYPE
    Diesel-electric attack submarine

  • ORIGIN
    Netherlands

  • NICKNAMES
    S-802 class (lead ship)

  • DESIGNED
    1974 - 1978

  • DESIGNER
    Rotterdamse Droogdok Maatschappij (RDM)

  • PRODUCTION
    1979 - 1994

  • PRODUCERS
    Netherlands - RDM

  • QUANTITY
    A total of 4 built, production complete.

  • UNIT COST
    470 million guilders in 1986

  • CHARACTERISTICS
    Silent operation
    Good intelligence systems
    Good diving depth
    Blue water capabilities
    Expensive in maintainance
    No AIP systems fitted

Introduction

The Walrus class is a diesel-electric attack submarine of Dutch origin. It was developed in the 1970’s as a replacement for the earlier Zwaardvis class. At the time of development the Walrus class was a very modern submarine and various improvement programs have kept the design up to date.

Layout

The Walrus class is a much improved version of the earlier Zwaardvis class. It retains the same teardrop shaped hull, but features numerous internal and external improvements. The use of stronger steel increases diving depth from 220 to 300 meters, automated systems reduce the required crew and X-shaped control planes are fitted. During upgrades a snort exhaust diffuser was added to the rear of the conning tower.

Firepower

The Walrus class has four 533mm torpedo tubes instead of six in the earlier Zwaardvis class. The Walrus is armed with the Mk 48 torpedo, but can also use the older NT-37 torpedo as used by earlier Dutch submarines. The Mk 48 torpedoes have been upgraded to ADCAP and CBASS standards. The Sub Harpoon can also be launched from the torpedo tubes and all related fire control systems were fitted, however the Sub Harpoon was not acquired by the Netherlands.

Electronics

The Walrus class is fitted with a bow mounted Octopus passive/active sonar, a Type 2026 towed array passive sonar and DUUX 5 passive sonar. A ZW07 surface search radar is also fitted, as are various ESM and signals intelligence systems. All sensors are connected to the SEWACO VIII combat data system.

Mobility

A diesel-electric propulsion system powers the Walrus class. It consists of two diesel engines that charge the batteries and provide propulsion under normal circumstances. When submerged below snorting depth an electrical motor is used. The maximum speed is 12 knots when surfaced and 20 knots submerged. The range is 10.000 nm at 9 knots. The maximum diving depth is 300 m.

Users

A total of four ships were built for the Dutch navy and all four remain in service. A mid life update carried out from 2008 to 2011 is to keep the Walrus class serviceable until the year 2025.

Variants

Walrus class

The Walrus class is a diesel-electric attack submarine developed in the 1970’s. Due to continuous upgrades the Walrus class remains one of the more capable modern non-nuclear submarines in service.

TypeAttack submarine
Crew52 incl 7 officers
Displacement2.465 t surfaced, 2.800 submerged
Length67.7 m
Width8.4 m
Draught7 m
Height?
Machinery3x SEMT-Pielstick 12 PA4 200 VG diesel engines, 6.300 hp
1x Holec motor, 6.910 hp
Propulsion1 shaft
Speed12 kt, 20 kt submerged
Range10.000 nm at 9 kt
SensorsSurface search: ZW07
Sonar: TSM 2272 Eledone Octopus hull mounted, Type 2026 towed arrady, DUUX 5 passive sonar
SystemsFCS: GTHW integrated torpedo and Harpoon
Data: SEWACO VIII
Data: Gipsy
CountermeasuresARGOS 700
Aircraft-
Cargo-
Remarks300 m diving depth
WeaponsTORP: 4x 533mm
Weapon14x 533mm torpedo tube in front hull
20 Mk.48/NT-37/Sub Harpoon or 40 mines
Weapon2-
Weapon3-
Weapon4-
Weapon5-
Weapon6-
Weapon7-
Weapon8-

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