U Class

Group Two 1941 Programme

Small Patrol Submarine

  • U Class Submarine
  • Unswerving
  • Vitality
  • Untiring
  • Varangian
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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 lengthenedis 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.

12 Built

Universal, Unsparing
Unswerving, Untiring
Upstart, Usurper
Uther, Vandal
Varangian, Varne, Vox

Vickers, Barrow-in-Furness.
1940 - 1943

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

Varne never actually served under the name Varne, she was transferred before commissioning to the exiled Royal Norwegian Navy as HNoMS Ula (S300).

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.


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.