Recognition Guide Warships of the Second World War
Kriegsmarine — Submarine

German submarine U-631

Type VIIC submarine

Displacement
757 long tons (769 t)
Length
67.1 m (220.1 ft)
Beam
6.2 m (20.3 ft)
Speed
17.7 knots (32.8 km/h, 20.4 mph)
Main gun
88 mm (3.5 in)

Service

  1. Kriegsmarine as U-63116 July 1942 — 17 October 1943458 days of the war
Type VIIC submarine Particulars
Name
U-631
Builder
Blohm & Voss, Hamburg
Ordered
15 August 1940
Laid down
5 September 1941
Launched
27 May 1942
Commissioned
16 July 1942
Fate
Sunk on 17 October 1943 (1943)
Status
Wreck

Specifications

Displacement, surfaced
757 long tons (769 t)
Displacement, submerged
857 long tons (871 t)
Length
67.1 m (220.1 ft) OA
Beam
6.2 m (20.3 ft)
Draught
4.74 m (15.6 ft)
Speed
17.7 knots (32.8 km/h, 20.4 mph)
Range
8,500 nmi (15,742 km)
Main gun
88 mm (3.5 in)

U-631 was a Type VIIC submarine built for the Kriegsmarine. Blohm & Voss, Hamburg laid her keel on 5 September 1941. Launched on 27 May 1942, she entered service on 16 July 1942.

Her class ran to 612 ships. The class followed the Type UB III, Vetehinen class and was succeeded by the Type XXI (Late-war replacement).

The boat displaced 757 long tons surfaced and 857 long tons submerged. She measured 67.1 m (220 ft) long with a beam of 6.2 m (20 ft). Her designed speed was 17.7 knots.

Her main battery was one 88 mm (3.5 in) guns.

She was in commission for 458 days of the Second World War.

She was sunk on 17 October 1943, at 58°13′N 32°29′W. 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
  • 2 shafts
  • 2 × diesel engines
  • 2 × electric motors
Power
  • 2800 - 3200 PS (diesels)
  • 750 PS (electric)
Armament
  • 5 × 53.3 cm torpedo tubes (four bow, one stern)
  • 14 × torpedoes or 26 TMA mines
  • 1 × 8.8 cm deck gun (220 rounds)
  • 1 × twin 2 cm C/30 anti-aircraft gun

Sister ships

587 more in the class

Sources