According to H.T. Lenton's "British Submarines", the first group had ten 21-inch torpedo tubes; all fired forward, four were external tubes- two amidships and two forward. Sixteen torpedoes were carried, ten in the tubes and six reloads for the six internal tubes. The second and third groups had eleven tubes, an external stern tube being added. Seventeen torpodoes were carried, eleven in the tubes plus six reloads for the internal tubes. The amidships external tubes were relocated and arranged to fire aft. Additionally, some of the first group had an external stern tube fitted later on, though the midships external tubes remained forward-firing.
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