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They were intended for training purposes as well as operations in confined waters.
Length 193 feet
Beam 24 feet
Draught 12 feet
Displacement (surface) varies between 640 tons and 735 tons. See individual ships for details.
Surface speed 13.75 knots
Submerged speed 10 knots
Complement 38.
1 x 3 inch High Angle gun,
6 21-inch torpedo tubes.