HMS H4

HMS H4 was a British H-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on 11 January 1915 and was commissioned on 5 June 1915. After her commissioning, HMS H4 and sister ships, and crossed the Atlantic from St. John's, Newfoundland to Gibraltar being escorted by the armed merchant cruiser. H4 sank the U-boat in the Adriatic Sea on 23 May 1918. She was sold on 30 November 1921 in Malta.

Design

She had a displacement of at the surface and while submerged. Her total length was, with a beam of and a draught of.
Her two diesel engines provided a total power of and her two electric motors provided power which gave the submarine a maximum surface speed of and a submerged speed of. She would normally carry of fuel and had a maximum capacity of and a range of. The boat was armed with a Hotchkiss quick-firing gun and four bow torpedo tubes with six torpedoes carried. The complement was twenty-two crew members.