hydroplane guards, this figure was undoubtedly exceeded.
Although the designed surface speed is given as 17 knots, it is doubtful whether any reliable in-service figures for speed and endurance were obtained since she did not complete until October 1917 and had little, if any, service as an operational submarine. Her designed diving depth is given as 200 feet and compared with that achieved by previous classes this would seem to be reasonable.
Her armament consisted of two 18-inch bow torpedo tubes, four 18-inch beam tubes and two 18-inch stern tubes (with 16 torpedoes carried). A 3-inch High-Angle (HA) gun was fitted on the superstructure just forward of the bridge and this was raised and lowered on a vertical ram.
