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1962 A-11A nuclear design
By 1962 the distinctive rotary torpedo magazine in the bow had been replaced by a much more conventional layout with four 533mm torpedo tubes and two 400mm tubes. Four 533mm reloads could be carried as well as sixteen 400mm weapons.





The boat already had the equal-diameter main hull sections which were being adopted in upcoming US Navy nuclear attack submarines, and had the advanced ‘X’ form control surfaces then being tested on USS Albacore.


Specifications
Surface displacement: 1170 tons
Length: 51.2 m
Hull diameter: 6.04 m
Power: 7,000 shp at 150 rpm.
Armament: 4 x 533mm (21”) torpedo tubes with a total of 8 torpedoes, 2 x 400mm (15.75”) lightweight torpedo tues with 16 torpedoes.
Crew: 21


The nuclear powered A-11A concept was dropped in 1962 for a number of factors, including political pressure and a growing skepticism towards nuclear technology (and especially nuclear weapons). Starting in 1960 US Navy ballistic missile submarines armed with Polaris SLBMs were stationed near Swedish waters with full knowledge of Swedish officials (this was later discontinued as new SLBMs provided greater ranges, thus allowing more distant operating areas). Sweden also had a far reaching and well advanced tactical nuclear weapons program at the time which was also dropped. One byproduct from the A-11A’s reactors was to have been plutonium for these nuclear weapons...