Dutch_WW2_Subs

This article was made possible by SecretProjects forum member MihoshiK. The information was originally posted to Dutchsubmarines.com but unfortunately has been lost since. By posting it here we hope to preserve and share knowledge of these interesting designs.

Advanced Dutch multi-hull submarine designs of World War Two

Flag At the start of World war Two, naval architects from the Dutch B.V. Nederlandsche Ver. Scheepsbouw Bureaux took refuge in the United Kingdom, where they continued to design submarines. Although the designs remained unbuilt, the designs give us an interesting insight into the unique and innovative Dutch submarine design tradition.

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Instead of a single pressure hull like almost all other submarines, the Dutch proposed five main tubular pressure hulls arranged in a cruciform with the main one running along the top, one below it at the front and back (with a break in the middle) and one running along each side. There was also a smaller pressure hull below the conning tower containing the captain’s cabin.

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Operational Submarine

Design # 2061

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Photograph of plans from collection of J.J. Kragten

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Photograph of plans from collection of J.J. Kragten

Specifications

Length: 89 meters (292 ft)

Beam: TBC

Displacement: 1,125 tons surfaced, 1,500 tons submerged

Speed: Maximum 22 kts surfaced, 20 kts submerged

Operating depth: 150m (500 ft)

Armament: 6 x 533mm (21”) torpedo tubes in bow, 4 x 533mm (21”) torpedo tubes in stern, with 6 reloads, 2 x 2.4 inch cannon (800 rds), 2 x quadruple 20 mm Oerlikon AA.

Cargo Submarine

Design # 2063

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Photograph of plans from collection of J.J. Kragten

CLICK for HIGH RESOLUTION:

Photograph of plans from collection of J.J. Kragten

Specifications

Length: 85 meters (279 ft)

Beam: TBC

Displacement: 1,600 tons surfaced, 2,000 tons submerged

Speed: Maximum 16 kts surfaced

Operating depth: 150m (500 ft)

Armament: None (234 mines, moored, contact, 1 ton each (replaces cargo))

Cargo: 150 tons

Postwar Legacy

The post-war 3-cylinder Dolfijn/Potvis-class design clearly stems from these designs, with a three-hull arrangement within a smooth outer casing. The three hulls are arranged in a triangle with the main hull on top containing forward and aft torpedo rooms plus the main accommodation and control spaces, and the engines and batteries in the lower hulls.

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