U.5 and U.6.
(Completed 1910.)
These are submarines of the Improved Holland type. Their submerged displacement is about 316 tons; length 135 feet, and beam 13 ½ feet. The horse-power of the petrol engines is 600 and that of the electric engines 189. The speed averages 12 knots on the surface and 8 knots when submerged. The surface cruising range is 1,300 knots at 10 knots an hour. Their armament consists of two bow tubes with four to six 18-inch Whitehead torpedoes. Their complement is sixteen officers and men.