HNLMS Willem van der Zaan - Lots of mines

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[Would nation should receive this ship?]
  • Future BeNeLux tech tree
  • UK
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Today I’d like to introduce you to the HNLMS Willem van der Zaan, a unique (as in, sole member of it’s class) minelayer. This ship could fill the role of a mid to higher tier minelayer in the game and I think it would make for a wonderful addition for a future Dutch-Belgian/BeNeLux tech tree.

Hr. Ms. Willem van der Zaan (1938 – 1970)

Willem van der Zaan during WW2

General description & service life


The Willem van der Zaan was the last minelayer to be built for the Royal Netherlands Navy before WW2 started. Because of that, she was very modern. This is noticeable because of her 4.7inch armament instead of the standard 3inch guns at the time and besides that she also has Hazemeyer control systems linked to the two double Bofors mounts. She was laid down in January 1938 and launched in December 1938. Her career officially started with her commissioning in August 1939. Only a month later she had already laid down her fist minefield of 98 mines near the naval city of Den Helder. In the same month she laid another 97 mines in the same area. A few other minefields were also done by her including Boomkersdiep (27 mines), Zuider Stortemelk (68 mines), Tactical barrage Northwest Vlieland (13 mines) and Southwest Vlieland (12 mines). Together with the ships Jan van Brakel and Nautilus she had also laid down the minefield Middelrug-Haaks (240 mines!). During the German invasion of the Netherlands she had also helped repel Luftwaffe attacks besides the primary minelaying role.

However may 13th she sailed towards England with some interesting cargo: 10 torpedoes and some other equipment for the cruiser Sumatra and 4 downed German aviators. During the month of June 1940 she was rebuild in the Portsmouth naval yard, this included new minerails, paravenes, 2 Depth charge racks, sonar and smokemaker. Her doublebarreled Bofors mounts were removed for studying by the British, she received a quad pom-pom instead. An interesting side note is that the British were quite pleased with the Dutch mounting and started using them theirselves on vessels including the Battle class (not the variant in game though). The months of July and August were spend laying down various minefields together with British minelayers including the HMS Plover and HMS Teviotbank. In the month of September she ran aground, but luckily was tugged and repaired. Now the month of October arrived and she goes for some repairs in King George’s drydock. Before this point she had completed 8 missions and laid a grand total of 2198 mines! The month of November was spent in convoys and in the same month she set sail for the Netherlands East Indies. In the months of April to December 1941 she spent laying minefields against the Japanese. December 1941 marked an overhaul of the ship after which she spent time hunting for submarines with depth charges. The year of 1943 was spent escorting and travelling, this included a visit to Bombay India. Skipping forward to November 1944 she had another maintenance and repairs job done to her in Shadwell Basin, London. After this she did some minelaying operations under the name “Buttermilk”. Minelaying continued to May 7 when Germany surrendered.

After the war she returned to the Netherlands, after which she went to the Netherlands East Indies, here she helped transporting P.O.W’s. Her last few major voyages included going to the Netherlands once again in 1947 – 1948 and being stationed in the Dutch West Indies until 1950. In 1950 she was rebuilt into a frigate. This included the removal of her minelaying ability by closing up the back. In 1961 she was converted into an accommodation and repair ship for minesweepers. In 1963 she was declared immobile and in 1970 she was stricken and sold for scrap in the same year.

General specifications



Displacement: 1247 tons, later 1407 tons

Length: 70m

Beam: 11.2m

Draught: 3.28m

Installed power: 2 Werkspoor Triple-expansion engines (2200 hp), 2 Yarrow boilers

Propulsion: 2 shafts

Speed: 15.5 knots

Crew: 92 (as minelayer), 130 (as training ship), 160 as frigate


Belt: all sideplating should be around 8mm

Deck: 50mm of wood + 5mm plating

Conning tower: I think 8mm

Note that the blueprint on it’s armour scheme is somewhat difficult to understand.



2 x 120 mm No. 7 Bofors (locally produced Bofors 4.7inch Mk 7 in a custom mounting)

4 x 40/56mm Bofors Nr.3 (2 double mounts with Hazemeyer FCS, stabilized)

4 x 12.7/90 (2 doubles)

120 mines


2 x 120mm No.7 Bofors

1 x 40/39 QF Mk VIII (quad pom-pom)

4 x 12.7/90 (2 doubles)

90 mines (British type)

2 depth charge racks


2 x 120 mm No. 7 Bofors

2 x 40mm L/70 Bofors (2 singles)

4 x 20/70 Mk 4 Oerlikon




Original design from 1936, note that this ship could carry a Fokker C. XIW recon hydroplane.

A different view



Emblem of Willem van der Zaan

Willem van der Zaan between 1945 and 1950 (Source: Collectie Nederlands Instituut voor Militaire historie)

Willem van der Zaan before it’s departure to the Dutch West Indies in 1948 (Source: Collectie Nederlands Instituut voor Militaire historie)

Willem van der Zaan in 1940, you can cleary see her Hazemeyer twin mount


Spoiler (blueprints)

History of the minelayer Willem van der Zaan (service history)

4.7 inch (main weaponry)

Willem van der Zaan Minelayer

Nederlandse mijnenleggers -

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