Jolly Roger Class
Walrus (2)
Boats in this Class
Walrus (2), Dolfijn (4)
Bruinvis, Zeeleeuw (2)

 

Dolfijn (4), Walrus (2) and Zeeleeuw (2) in 1996. Note the new snort exhaust diffuser on the sail of the second submarine Dolfijn (4), Walrus (2) and Zeeleeuw (2)

For additional photos and information please check the 'related pages list' at the bottom of this page.

 

Boat Walrus (2) Zeeleeuw (2) Dolfijn (4) Bruinvis
Pennant # S802 S803 S808 S810
Call sign PACU PASZ PAFF PAIT
NAPO # 368 372 322 318
Yard # 348 349 352 353
Type Conventional attack submarine
Class name Walrus (2). Named after first of class. Second class named Walrus
Design Dutch.
Navy estimates Money set aside in 1975.
Building contract 16 June/Aug 1979 17 Dec 1979 16 Aug 1985 16 Aug 1985
Laid down 11 Oct 1979 24 Sep 1981 12 June 1986 14 Apr 1988
Launched 28 Oct 1985 20 June 1987 25 Apr 1990 25 4/5 1992
Re-launched 13 Sep 1989 - - -
Trials       4 Mar - 25 Oct 1993
Commissioned 25 Mar 1992 25 Apr 1990 29 Jan 1993 5 July 1994
Decommissioned Early 21 century
Design Dutch: RDM, NEVESBU, VEREBUS, Royal Navy.
Improved Zwaardvis (2)
Shipyard Rotterdamse Droogdok Maatschappij, Rotterdam
Cost Original 212,500,000 Dutch guilders; later raised to 470,000,000 guilders
Le x Be x Dr 67.73 m x 8.4 m x 6.6 m (7 m according to some sources)
Displ. sur/sub/stnrd 2450 t / 2800 t / 1900 t
Propulsion Diesel-electric
Engines Three 12-cylinder 4-stroke PA4 200 VG SEMPT-Pielstick diesel engines, 4.63 MW, 6300 hp(m), 3 alternators 2.88 MW.
Main motor One Holec electric motor, 6910 apk, 5.1 MW
Batteries Varta, 420 cells
(German Exide type has also been reported)
In July 2000 the Dutch government reported an order for batteries from Exide Deutschland.
Shaft/Propeller 1 shaft / 5 blades (some sources report 7 blades, which is incorrect)
Speed surf/subm 13 kts / 21 kts
Range snorting 10000 nm at 9 kts
Diving depth Officially >300 m.
Exact diving depth is classified but probably >400 m
Complement 50 up to 55 is being reported. 52 according to the Dutch Navy.
10 off, 12 sub. off., 15 corp., 15 enlisted.
Latest figures of the Dutch Navy indicate a crew of 55. 9 Officers, 12 Sub-officers, 34 Corporals and sailors.
Torpedo tubes 4 x 21" bow. Mk 67 NL mod Water-ram discharge from Vickers, Canada
Mk 19 turbine ejection pump (TEP).
Torpedo type Honeywell Mk 48 Mod 4 and Mk 48 ADCAP.
Honeywell NT 37 C/D/E. Probably only kept on stock at the shore base.
Missiles SSM: McDonnell Douglas Sub-Harpoon.
The class can fire the Sub-Harpoon, but none are bought.
Armament 20 torpedoes or Sub-Harpoon. 40 mines in lieu of torpedoes.
2001: Unconfirmed: Sub-Harpoon not used anymore
Decoys Type and number unknown.
Fire control HSA SEWACO VIII action data automation, which is the same as HSA GIPSY data/combat system.
GTHW integrated Harpoon and Torpedo FCS
Radar Surface navigational?: Signaal / Decca 1229.
Surface search: Signaal ZW-07.
Sonar Also read the 'notes'
Towed array: GEC Avionics / Dutch type 2026 with Signaal display processor, Marconi beam-former and an Ameeco wet end; passive search; very low frequency.
LRS, Long Range Sonar
Hull mounted: Thomson Sintra Elodone Octopus; Thomson-Sintra TSM 2272. passive/active search/attack; medium frequency; 64 stave
?ETBF and Acoustic Telemetry Fenelon; Thomson-Sintra TSM 2225
passive ranging.
Thomson Sintra DUUX 5, passive ranging and intercept.
Probably: Flank array FAS 3-1A.
Probably: Hybrid flank array. Using commercial Interstate Electronics Corp. spectrum analyzer, an HP-1311A display unit , and TNO's interface type JO116 electronic unit.
Probably: EDO 1550 obstacle avoidance sonar.
ESM Radar warning: Argo Phoenix I .
According to some sources: Argos 700 radar warning.
In July 2000 the Dutch government reported an order for DR3000 systems from Thomson-CSF Detexis.
In order to replace the original Kollmorgen antenna's ACAL Nederland delivered an improved ESM early-warning antenna in 1994.
These antennas are installed in a watertight dome on the search perisscope. A GPS antenna is included in the same dome.
In 2000 ACAL Nederland delivered an upgrade. The upgrade consists of an expansion as well as improvement of the antenna specifications.
Periscopes Search: Kollmorgen type 76, designation for this Walrus (2) version is type 979
Attack: Kollmorgen type 76, designation for this Walrus (2) version is type 978
Some sources report 2 x Barr & Stroud, which is incorrect.
Communications Late 1998: Radio Holland Marine GMDSS communications equipment, details.
Notes

- Equipped with Hydraudyne drive and controls
- Improved Zwaardvis (2) class with similar dimensions and identical silhouettes except for the X-stern. Use of new H.T. steel increased the diving depth by some 50 percent.
- New fire control, command and automation system reduced the crew from 65 to 49. In 1981 various changes to the design were made which resulted in a delay of 1-2 years. Equipped with DSRV lock.
- In March 1996 talks between RDM and China, concerning Walrus class type submarines, are reported.
- In 1998/1999 the Dutch company Nedinsco delivered new plotting tables for these boats.
- The CUP of these subs will possibly incorporate: New batteries with more capacity and a longer lifecycle; Updated SEWACO; New MRS; New processing unit for the LRS; Several 'brown water' adjustments including Harpoon II system.
- Research for the use of anechoic tiles on these boats has been reported.
- A lot of equipment, including towed array gear, is stored in the UK.
- The subs will be refitted/modernized around 2009. AIP will be one of the possible improvements.
- Water maker produces 2000 litres a day (2002 data)
- In March 2003 the "U.S. Office of Naval Research" wrote: "The Netherlands is working to extend the life of these ships to 2025. Most of the discussion cantered on improved signal processing to extend the capability of the existing sensor arrays. The Walrus-class has an ahead looking sonar, a 24 element single line flank array and a towed array. It also has three hydrophones spaced along both the port and starboard sides for passive ranging. There was discussion of conventional and adaptive beam forming, inverse beam forming, and synthetic aperture processing techniques. The objective is to improve the performance of the flank array to that of the towed array, even at higher tow speeds. The passive ranging system uses three single hydrophones spaced along the side of the submarine."
- When the RN stopped using this type of towed array the Dutch Navy took over the gear. It is now stored at the ODC (storage and distribution center) in Den Helder.
- The tender Mercuur (4) can be equipped with a facility to attach a towed array to the Walrus (2) class submarines on location. It is also possible to hire a third party vessel on location.

 

 

Walrus(2) class related pages
Walrus (2) class specifications
Walrus (2) Class Submarines article
Various photo pages
Walrus (2) class video footage
 
Walrus(2) class related books
none
   

 

Cut-away view of a Walrus (2) class submarine Cut-away view of a Walrus (2) class submarine

 

 

 

 

 

 

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