OVERVIEW: The A-11B Sjöormen is a conventional submarine, serving with the Swedish Navy from 1968. It represents a significant step in Sweden's indigenous submarine design and construction capabilities.

DETAILS:
The Sjöormen class was developed in the 1960s as a replacement for older submarines within the Swedish fleet. The design philosophy emphasized stealth, maneuverability in the shallow and complex Baltic Sea environment, and the ability to effectively engage surface and subsurface threats. The Sjöormen design incorporated several advanced features for its time, including a streamlined hull for improved underwater performance and a relatively quiet propulsion system aimed at minimizing acoustic signature. The class served as an important bridge between earlier Swedish submarine designs and the later, more advanced submarines that followed. The design experience gained with the Sjöormen class directly informed the development of subsequent generations of Swedish submarines.

The primary roles of the A-11B Sjöormen include anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence gathering. In the ASW role, the vessel leverages its Sonar 62 system for the detection, tracking, and targeting of enemy submarines. The 400mm torpedo tubes would likely be used to deploy wire-guided torpedoes optimized for engaging submerged targets in the littoral environment, while the 533mm torpedo tubes offer the capability to deploy heavier, longer-range torpedoes suitable for engaging surface combatants. The inclusion of a Generic Acoustic Intercept system indicates a capability to passively detect and classify vessels based on their acoustic signatures. The vessel would likely operate in the Baltic Sea and surrounding waters, supporting Sweden's maritime defense strategy.

The A-11B Sjöormen's sensor suite provides a comprehensive situational awareness picture. The PS-829 and PQ-833 likely represent radar systems, providing surface search and navigation capabilities when operating at periscope depth. The Sonar 62 is the primary active and passive sonar system for detecting underwater threats. The Generic Submarine Periscope, Optical allows for visual observation of the surrounding environment. The Signal Ejector provides a means of underwater communication, employing both acoustic and visual signals. The combination of 533mm and 400mm torpedo tubes allows for a flexible armament configuration, enabling the submarine to engage a wide range of targets with appropriate weapon systems.

SPECIFICATION: Length: 50.5 m || Beam: 6.1 m || Draft: 5.8 m || Disp: 1125 t

SENSORS: PS-829 || PQ-833 || Sonar 62 || Generic Acoustic Intercept || Generic Submarine Periscope, Optical

ARMAMENT: Signal Ejector || 533mm TT || 400mm TT