'Fleet Submarine' (SSN
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This class was the first all-British nuclear-powered submarine.
Rolls-Royce were responsible for building the steam-raising plant and English Electric responsible for the steam turbines. This class would serve as the prototype for all further British-built Fleet submarines.
Their dimensions were somewhat larger than the 'Dreadnought' class.
1963 - 1967
Geared steam turbines, one shaft.
Emergency drive batteries and electric motor.