HMS H12

HMS H12 was a British H-class submarine built by Fore River Yard, Quincy, Massachusetts. She was laid down on an unknown date and commissioned in 1915. HMS H12 along with HMS H11 and HMS H13 through HMS H20 were all built in America but were interned by the United States government until the United States entered World War I. H12 was sold in April 1920 at Dover.

HMS H4, another submarine of the same class
History
United Kingdom
Name	HMS H12
Builder	Fore River Yard
Commissioned	1915
Fate	Sold, April 1920
General characteristics
Class & type	H-class submarine

Design

She had a displacement of 364 long tons (370 t) at the surface and 434 long tons (441 t) while submerged. Her total length was 150 feet 3 inches (45.8 m), with a beam of 15 feet 4 inches (4.7 m) and a draught of 12 feet (3.7 m).

Her two diesel engines provided a total power of 480 horsepower (360 kW) and her two electric motors provided 320 horsepower (240 kW) power which gave the submarine a maximum surface speed of 13 knots (24 km/h; 15 mph) and a submerged speed of 11 knots (20 km/h; 13 mph). She would normally carry 16.4 long tons (16.7 t) of fuel and had a maximum capacity of 18 long tons (18 t)^[1] and a range of 1,600 nautical miles (2,963 km; 1,841 mi). The boat was armed with a 6-pounder (2.7 kg) Hotchkiss quick-firing gun and four 18-inch (457 mm) bow torpedo tubes with six 18-inch (457 mm) torpedoes carried. The complement was twenty-two crew members.