U Class

Group Two 1940 Programme

Small Patrol Submarine

  • U Class Submarine
  • Ultimatum 1943
  • Ultor
  • Unbroken
  • Unison
  • United 1944
  • Unrivalled
  • Unruffled 1943
  • Unruly 1943
  • Unseen
  • Unshaken
  • Uproar 1941
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The design of the U Class was kept up to date and this group showed improvements on the first group. They were designed without external bow tubes and the bows reshaped and lengthened this class was built primarily for A/S training and to replace the 'H' class which by this time were considered very much past their best.   Originally not intended for war but forced into the role by hostilities and the fact that they could be produced very quickly.

In theory they were in all aspects inferior to almost all foreign submarines, their performance and success during WWII proved otherwise.

The need for these boats to be used operationally decreased after hostilities ceased in the Mediterranean and stopped altogether at the end of WWII.   Consequently they were used in the role for which they were originally intended, Anti-Submarine Training boats.

22 Built

Ultimatum, Ultor,
Umbra, Unbending, Unbroken, Unison, United, Unrivalled, Unruffled, Unruly, Unseen, Unshaken, Unsparing, Unswerving, Untamed, Untiring, Uproar, P.32, P.33, P.36, P.38, P.39, P.48

Vickers, Barrow-in-Furness.
1940 - 1943

P.41 was built by Vickers for the Norwegian Navy and named Uredd, she was lost in 1943.
P.47 was built by Vickers for the Royal Netherlands Navy.
P.52 was built by Vickers for the Polish Navy.
P.81 to P.87 were cancelled.

Unbroken and Unison were lent to the Soviet Navy from July 1944 to February 1949.

Vox(1) was tranferred on loan to the Free French Navy from May 1943 to September 1946 and renamed Curie.

P.41 was loaned to the Norwegian Navy and renamed Uredd in December 1941, she was lost in February 1943.  Varne(1) was transferred to the Norwegian Navy and renamed Ula in March 1943.

Untiring and Upstart were lent to the Greek Navy from July and August respectively and returned in 1952. Untiring was renamed Xifias and Upstart renamed Amfitriti.

P.52 on being returned by the Polish Navy was lent to the Danish Navy in 1946 and returned in 1957. During this period she was renamed first as U.1 and again in 1948 to Springeren.


Technical Information

545 sf
740 sm

Length (ft):
196.83 oa

Breadth (ft):

Draught/Height (ft):

Davey Paxman diesel engines 615 bhp
General Electric motors 825 bhp

Speed (kts):
11.75 sf
9 sm

Oil Supply (tons):

1 x 3 inch/45 QF MkI.
3 x 0.303 inch Lewis or Vickers MG.
4 x 21 inch bow tubes, 4 reloads or 6 MkII mines.

5,000/120 nmiles at 10/2 kts.