Recognition Guide Warships of the Second World War
Royal Navy — Submarine

HMS H31

H-class submarine

Displacement
423 long tons (430 t)
Length
52.12 m (171 ft)
Beam
4.57 m (15 ft)
Speed
11.5 knots (21.3 km/h, 13.2 mph)
Complement
22

Service

  1. Royal Navy as HMS H3121 February 1919 — 24 December 1941845 days of the war
H-class submarine Particulars
Name
HMS H31
Builder
Vickers Limited, Barrow-in-Furness
Laid down
19 April 1917
Launched
16 November 1918
Commissioned
21 February 1919
Fate
Sunk, between 19 and 24 December 1941 (1941)
Status
Wreck

Specifications

Displacement, surfaced
423 long tons (430 t)
Displacement, submerged
510 long tons (518 t)
Length
52.12 m (171 ft)
Beam
4.57 m (15 ft)
Speed
11.5 knots (21.3 km/h, 13.2 mph)
Range
2,985 nmi (5,528 km)
Complement
22

HMS H31 was a H-class submarine built for the Royal Navy. Vickers Limited, Barrow-in-Furness laid her keel on 19 April 1917. Launched on 16 November 1918, she entered service on 21 February 1919.

She was one of 23 ships of her class. The class followed the E and F-class destroyer and was succeeded by the I-class destroyer.

The boat displaced 423 long tons surfaced and 510 long tons submerged. She measured 52.1 m (171 ft) long with a beam of 4.6 m (15 ft). Her designed speed was 11.5 knots, and she carried a complement of 22.

Her main battery was four 533 mm (21 in) guns.

She was in commission for 845 days of the Second World War.

She was sunk on 24 December 1941. The wreck survives.

Written from the harvested record. Every figure above is sourced; the wording is this site's own.

Armament and machinery

Armament and machinery
Propulsion
  • 1 × 480 hp diesel engine
  • 2 × 620 hp electric motors
Armament
  • 4 × 21 in bow torpedo tubes
  • 8 × 21-inch torpedoes

Sister ships

Sources

  • Facts harvested from HMS H31 on Wikipedia. Figures only — no wording is taken from it.