THE WORLD’S FASTEST SUBMARINE.

Taranaki Herald, Volume LXVII, Issue 16462, 14 June 1919, Page 4

THE WORLD’S FASTEST SUBMARINE.

The fastest submarine vessels in the world were designed and constructed for the British Navy during the war. They were evolved in response to the demand for submersible craft which could keep station with the fleet when cruising, and also undertake long voyages without the aid of “mother craft.” Many new features were embodied in this class, which has proved itself a conspicuous triumph of British engineering. Unlike other submarines they are fitted with steam turbines, which are used during operations at a high speed on the surface. Secondary propelling power is obtained from a heavy oil-engine of 800 brake horse-power, which drives a dynamo supplying electricity either to electric motors geared to the propeller shafts (for surface cruising at moderate speeds) or to electric batteries which store energy for propulsion under water. When submerged, these vessels have a displacement of 2570 tons. They are nearly 340 feet long and have a double hull except at the ends. An exceptionally powerful wireless telegraph installation is fitted for long-distance work; the aerials are carried on long telescopic masts operated by a telemeter system. Electricity is also used for driving the air compressors and bilge pumps, while the steering gear and the hydroplane driving gears are controlled by a special hydro-electric system.