Dutch Submarines: The Zwaardvis (2) submarine class

Boat	Zwaardvis (2)	Tijgerhaai (2)
Pennant #	S806	S807
Yard #	320	321
Type	Conventional patrol submarine
Class name	Zwaardvis (2). Named after first of class. Second class named Zwaardvis
Navy estimates	First instalment approved in 1964.
Ordered	24 Dec 1965
Laid down	14 July 1966
Launched	2 July 1970	25 May 1971
Commissioned	18 Aug 1972	20 Oct 1972
Midlife conv.	1989-90	1987-88
Decommissioned	1994	1995
Fate	?Probably will be sold/leased to Malaysia?, this deal did not pull off and the subs are currently laid-upin a Taiwanese shipyard.
Design	Based on the Barbel class (U.S.A)
Shipyard	Rotterdamse Droogdok Maatschappij, Rotterdam, the Netherlands
Le x Be x Dr	66.92 m x 8.40 m x 7.10 m
Displ. surf/subm	2350 t / 2620 t
Propulsion	Diesel-electric
Engines	Three Werkspoor RUB 215x12 diesel engines + generators; 4 stroke; turbo charged; 4200 shp; 980 Kw at 1500 rpm.
Main motor	One motor, 5100 shp
Batteries	2 groups
Shaft/Propeller	1 shaft / Five-bladed propeller
Speed surf/subm	13 kts / burst speed over 20 kts
Range snorting	10000 nm at 9 kts
Diving depth	>220 m
Complement	65 or 67, incl. 8 officers
Torpedo tubes	6 x 21" bow. Two torpedoes can be launched simultaneously. 'Catapult' launch system can launch torpedoes up to a depth of 200 meters
Torpedo type	When built: Honeywell Mk 37^mod2 plus the upgrades NT 37 C ^mod2 and NT 37 C/D/E
	Honeywell Mk 48 Mod 4
Armament	20 torpedoes
Fire control	When built: HSA M8.
	After refit: Scaled-down HSA GIPSY, retaining the earlier M8/7 FCS
Radar	Surface search: British type 1001; I band
Sonar as build	Hull mounted: Krupp Atlas; passive ranging; medium frequency.
	Hull mounted: Krupp Atlas DSQS 21; passive/active search and attack; medium frequency.
Sonar after refit	Hull Mounted: French Thomson Sintra Eledone (?Octopus). passive/active search and attack; medium frequency; 32 stave.
	Towed array: GEC Avionics type 2026, passive search, VLF.
	Sonar dome aft of the sail probably also removed during the refit.
Sonar period ?	Probably: Flank array FAS 3-1A standalone.
	Flank array: Hybrid flank array. Using commercial Interstate Electronics Corp. spectrum analyzer, an HP-1311A display unit , and TNO's interface type JO116 electronic unit.
ESM	Radar warning: Argos 700 radar warning. Probably: The S-Ku band ESM system is designated SPR-06/00, using a BBR-05/00 receiver and an EIS-1 classifier. The system monitors all bands, but must be set to analyze in only one at a time (frequency, PRF, pulse width). It is not clear whether this is the same system as the AR 700 system (see above).
Scopes	Search: Barr & Stroud CK 027. Attack: Barr & Stroud CH 077.
Notes	- Teardrop hull design. - Two Chien Lung/Hai Lung class submarines, which are variations on the Zwaardvis (2) design, were exported to Taiwan in the 1980s. - After the Dutch Navy decommissioned these subs there have been many rumours about a possible deal, between R.D.M. and a foreign country, to sell these two submarines. Check the news section and the individual boat histories of Zwaardvis (2) and Tijgerhaai (2) for more information. - Reserve fuel tank #5 normally used to store 25 t of water

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