Recognition Guide Warships of the Second World War
Royal Navy — Submarine N55

HMS Undaunted (N55)

British U-class submarine

Displacement
540 long tons (549 t)
Length
58.22 m (191 ft)
Beam
4.9 m (16.1 ft)
Speed
11.3 knots (20.8 km/h, 12.9 mph)
Complement
27
Main gun
76 mm (3 in)

Service

  1. Royal Navy as HMS Undaunted30 December 1940 — 11 May 1941134 days of the war
British U-class submarine Particulars
Name
HMS Undaunted
Pennant / hull number
N55
Builder
Vickers Armstrongs, Barrow-in-Furness
Laid down
2 December 1939
Launched
20 August 1940
Commissioned
30 December 1940
Fate
Sunk 11 May 1941 (1941)
Status
Wreck

Specifications

Displacement, surfaced
540 long tons (549 t)
Displacement, submerged
730 long tons (742 t)
Length
58.22 m (191 ft)
Beam
4.9 m (16.1 ft)
Draught
4.62 m (15.2 ft)
Speed
11.3 knots (20.8 km/h, 12.9 mph)
Complement
27
Main gun
76 mm (3 in)

HMS Undaunted was a British U-class submarine, operated by the Royal Navy. She carried the pennant number N55. Her keel was laid at Vickers Armstrongs, Barrow-in-Furness on 2 December 1939. Launched on 20 August 1940, she entered service on 30 December 1940.

She was one of 53 ships of her class.

The boat displaced 540 long tons surfaced and 730 long tons submerged. She measured 58.2 m (191 ft) long with a beam of 4.9 m (16 ft). Her designed speed was 11.2 knots, and she carried a complement of 27. Her main battery was of 76 mm (3.0 in) calibre.

She was in commission for 134 days of the Second World War.

She was sunk on 11 May 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
  • 2 shaft diesel-electric
  • 2 Paxman Ricardo diesel generators + electric motors
  • 615 / 825 hp
Armament
  • 4 bow internal 21 inch (533 mm) torpedo tubes - 8 - 10 torpedoes
  • 1 - 3 in gun

Sister ships

28 more in the class

Sources