HMS H23

HMS H23 was a British H class submarine built by Vickers Limited, Barrow-in-Furness as part of the Batch-3 H class submarine. She was launched on 29 January 1918 and was commissioned on 25 May 1918. She had a complement of 22 crew members.

HMS H23 was sold on 4 May 1934 in Sunderland.

Design
Like all post-H20 British H-class submarines, H23 had a displacement of 423 LT at the surface and 510 LT while submerged. It had a total length of 171 ft, a beam of 15 ft, and a draught of 12 m. It contained a diesel engines providing a total power of 480 hp and two electric motors each providing 320 hp power. The use of its electric motors made the submarine travel at 11 kn. It would normally carry 16.4 LT of fuel and had a maximum capacity of 18 LT.

The submarine had a maximum surface speed of 13 kn and a submerged speed of 10.5 kn. Post-H20 British H-class submarines had ranges of 2985 nmi at speeds of 7.5 kn when surfaced. H23 was fitted with an anti-aircraft gun and four 21 in torpedo tubes. Its torpedo tubes were fitted to the bows and the submarine was loaded with eight 21 in torpedoes. It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.