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 to HMS H20 were all built in America but were interned by the United States government until the United States entered World War I.
HMS H12 was sold in April 1920 in Dover.

Design

Like all pre-H21 British H-class submarines, H12 had a displacement of at the surface and while submerged. It had a total length of, a beam length of, and a draught length of. It contained a diesel engines providing a total power of and two electric motors each providing power. The use of its electric motors made the submarine travel at. It would normally carry of fuel and had a maximum capacity of.
The submarine had a maximum surface speed of and a submerged speed of. British H-class submarines had ranges of at speeds of. H12 was fitted with a Hotchkiss quick-firing gun and four torpedo tubes. Its torpedo tubes were fitted to the bows and the submarine was loaded with eight torpedoes. It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.