For additional photos and information please check the 'related pages list' at the bottom of this page.
|Dolfijn (3)||Zeehond (3)||Potvis||Tonijn|
|Type||SSK. Conventional ocean-going patrol submarine|
|Class name||Dolfijn / Potvis. Named after
first of class.
Dolfijn and Potvis are officially considered to be a separate class, the Dolfijn class consisting of Dolfijn (3) / Zeehond(3) and the Potvis class consisting of Potvis / Tonijn.
But all four boats are almost identical after modernization.
|Laid down||30 Dec 1954||30 Dec 1954||17 Sep 1962||26 Oct 1962|
|Launched||20 May 1959||20 Feb 1960||12 Jan 1965||14 June 1965|
|Commissioned||16 Dec 1960||16 Mar 1961||2 Nov 1965||24 Feb 1966|
|Modernized||1965-66||1966-67||Dsls: 1982-83||Dsls: 1979|
|Decommissioned||29 Apr 1982||11 Jan 1990 (in reserve)||18 June 1992||10 Jan 1991|
|Fate||22 Jul 1985
Sold for scrap
|15 July 1994
Sold for scrap
|Design||Dutch. Three cylinder hull. First design by the engineer F. Gunning.|
|Shipyard||Rotterdamse Droogdok Mij, Rotterdam||Wilton-Fijenoord, Schiedam|
|Le x Be x Dr||79.5 m x 7.8 m x 4.8 m||78.3 m x 7.8 m x 5 m|
|Displacement Stnd/Surf/Subm||114o t / 1530 t / 1830 t||1140 t / 1509 t / 1831 t|
|Engines||Two 12-cylinder M.A.N. 12-V6V 22/30 diesel engines, 4 stroke, 2 x1250 apk, 2800 bhp||When built: Two 12-cylinder M.A.N. 12-V6V 22/30 diesel engines, 4 stroke, 2 x1250 apk, 2800 bhp|
|After refit: Two SEMPT-Pielstick PA4, 4 stroke, 2 x 1550 apk.|
|Main motors||Smit motors; 2 x 2200 apk; 4200
After a refit Zeehond (3) is equipped with Holec motors; 2 x 2200 apk
|Batteries||British, 2 x 168 cells, 7420 Ah during 5 hours||Varta, 2 x 168 cells, 7420 Ah during 5 hours|
|Shafts / Prop.||2 shafts with five bladed propeller|
|Speed surf/subm||14.5 kts / 17 kts (for 30 minutes)|
|Range||45 days at sea. 70 hours submerged on battery power without snorting. 4.5 days (oxygen supply)|
|Diving depth||300 m. Calculated diving depth is 350 m.
An accidental dive (with the Tonijn) to 400m has been reported.
According to a former Cdt. of Tonijn and Zeehond (3) this is incorrect. Diving depth was 200 m and an accidental dive to 400 m is impossible
|Complement||67, including 8 officers.|
|Torpedo tubes||4 x 21" bow, 4 x 21" stern|
|Torpedo type||Mk 8, Honeywell Mk 37 mod2 (since 1969) plus the upgrades NT 37 C mod2 and NT 37 C/D/E|
According to a former Cdt. of Tonijn and Zeehond (3) this is incorrect. This submarine class was never fitted with Mk 48's
|Mines||NATO standard mines|
|Armament||18 Mk 8
22 Mk 37 (a total of 16 is also reported)
20 Mk 48 (a total of 16 is also reported)
We are not sure if these numbers are correct. Please contact us if you have additional information.
|Fire control||When built: HSA M8/0.|
|After refitting: HSA M8/17.|
|Radar||Surface search: British type 1001, I band.|
|Sonar||Hull mounted: passive search and attack, medium frequency.|
|Sonar-interception: LWS-20D since
LWS stands for Luister Waarschuwings Sonar / Listen Warning Sonar.
|Periscope||2 Barr & Stroud|
|Notes||- Triple hull design. Pressure hull
consists of three cylinders arranged in a triangular shape The upper
cylinder accommodates the crew, navigational equipment and armament. The
lower two cylinders house the propulsion machinery, as well as store
- First design by the engineer F. Gunning (working for NEVESBU in 's-Gravenhage) during World War II intended for freight submarines which should supply the island of Malta. More information on these designs at the 4 cylinder submarine page.
- The construction of Potvis and Tonijn was delayed because it was considered giving them nuclear power plants, but financial? concerns prevented this.
- One of the prototype tubes of this class is used for the torpedo-trials vessel Van Bochove.
- Since the summer of 1994 Tonijn is open to the public at the Den Helder Navy Museum.
|Dolfijn & Potvis class related pages|
|Dolfijn & Potvis class specifications|
|Dolfijn & Potvis class photos|
|Dolfijn (3) boat history|
|Zeehond (3) boat history|
|Potvis boat history|
|Tonijn boat history|
|Various photo pages|
|Dolfijn & Potvis class related books|
|Drie-Cylinders Duiken Dieper|
|Tonijn museum submarine|
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