Sverige-class coastal defence ship explained

The Sverige-class coastal defence ships were a class of coastal defence ships that, at the time of introduction, were the largest ships to serve in the Swedish Navy. Their design was completely new and was influenced by the ships of the time. Their armament consisted of four 2830NaN0/45 cal. Bofors guns in two turrets and eight 1520NaN0 Bofors guns in one double and six single turrets. During the Second World War they were the backbone of the Swedish Navy.

Specifications

Displacement

Dimensions

Armour

Machinery

Armament

As built

Modernizations

Appearance

All three ships looked similar until reconstruction. Gustav V had funnels trunked into one and the upper works modified heavily. Sverige had the fore funnel trunked back away from the superstructure which was modified, and kept the second funnel, making the ships very different in appearance between the main turrets.Gustav V also had her forward superfiring twin 1520NaN0 turret removed, and replaced with a platform for gyro-stabilized AA artillery (4 x 40 mm bofors) while Sverige and Drottning Victoria had their midship single 1520NaN0 guns removed and replaced with gyro-stabilized AA platforms (Bofors 40 mm double mountings)

Ships

Three of these ships were built:

A fourth ship was considered but not built due to economic difficulties.

The ships were modernised in the 1930s with oil-fired boilers replacing the old coal-fired boilers, removal of underwater torpedo equipment, new anti-aircraft guns, and new fire control equipment.

The underwater torpedo tubes that proved outdated already upon completion turned out to be a "lucky mistake". The removal of the tubes as well as torpedo storage and work areas opened up well needed spaces in the best protected areas of the ship for modern fire control systems. All ships had several upgrades of fire control systems during their lifetime both for surface-, and later centralized AA fire control.

Plans were drawn up in the 1940s to modernize Drottning Victoria by rebuilding the superstructure, increasing the elevation of the main turrets to 32 degrees, and replacing the light armament with 2 twin 57mm guns and 12 40mm/56 Bofors guns in 4 twin and 4 single mounts, as well as 10 25mm Bofors mounts. This would have more than doubled the weight of anti-aircraft fire per minute. These plans were never undertaken. The plans and an essay explaining them can be viewed in here on pages 103 to 113.[1]

Tactical doctrine and effectiveness

The Sverige-class ships differed in several ways from the classical coastal defence ship: at first by heavier armament as well as better speed and armour, but still small enough to operate and hide in the archipelagos and shallow waters. But the main difference was to be noted in their tactical doctrine and operations. Unlike other coastal defence ships, the Sverige class formed the core of a traditional open-sea battle group (Coastal Fleet), operating with cruisers, destroyers, torpedo boats and air reconnaissance like traditional battleship tactics of the time. This "mini battle group" had no intention, nor need, to challenge the superpowers in blue sea battles, but rather to operate as defensive shield against any aggression challenging Swedish interests and territory. Based on the doctrine that one needs a battle group to challenge a battle group, the Coastal Fleet presented a considerable obstacle to anything smaller than a full-size battleship or battlecruiser, but in a tactical situation where full-size battleships would have very limited operational space exposing them to submarines, fast torpedo crafts, land based dive-bombers and minefields.

References

Notes and References

  1. Bjurnerska utredningen 1945

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