Submarines

U class

49 ships

The U class submarine HMS Undine (i). She was lost on 7 Jan 1940.

Type	Submarine
Displacement	540 / 730 BRT
Length	191.5 feet
Complement	27 men
Armament	3 MG AA 6 21" torpedo tubes (4 bow, 2 bow external) 10 torpedoes
Max speed	11.75 / 9 knots (surfaced/submerged)
Engines	Diesel / Electric, 2 shafts
Power	615 / 825 HP (surfaced/submerged)
Notes on class	The U class were originally developed as unarmed training boats to replace the WWI H-class. They were fitted with torpedo tubes to allow them to be used operationally. Small and manoeuvrable (630 tons) they were well suited to the confined waters of the North Sea and Mediterranean. They were succeeded replaced by the very similar but partially welded V-class. Cheap, reliable and quickly produced, these were the workhorses of the wartime submarine service. The specifications as given above are for the first group. Further specifications on the later groups; 2nd Group; Same as the first group except; Complement: 31 men Lenght: same as for the first group except: Umpire, Una, Unbeaten ,Undaunted, Union and Urchin 196.75 feet Armament: 1 3" gun 3 MG AA 6 21" torpedo tubes (4 bow, 2 bow external) except Umpire, Una, Unbeaten ,Undaunted, Union and Urchin 4 21" torpedo tubes (4 bow) 10 torpedoes except Umpire, Una, Unbeaten ,Undaunted, Union and Urchin 8 torpedoes 3th group; Same as the first group except; Displacement: 545 / 740 BRT Complement: 31 men Lenght: 196.75 feet Armament: 1 3" gun 3 MG AA 4 21" torpedo tubes (4 bow) 8 torpedoes Speed:14.25 / 9 knots

All ships of the U class:

Royal Navy (more on Royal Navy)

HMS Undine (i) (N 48) (lost 7 Jan 1940)
HMS Unity (N 66) (lost 29 Apr 1940)
HMS Ursula (N 59) (Became the Soviet submarine V-4)

Soviet Navy (more on Soviet Navy)

V-4 (ex. HMS Ursula)

Royal Navy (more on Royal Navy)

HMS Urchin (N 97) (Became the Polish submarine Sokol)
HMS Umpire (N 82) (lost 19 Jul 1941)
HMS Una (N 87)
HMS Unbeaten (N 93) (lost 11 Nov 1942)
HMS Undaunted (i) (N 55) (lost 11 May 1941)
HMS Union (N 56) (lost 20 Jul 1941)
HMS Unique (N 95) (lost 24 Oct 1942)
HMS Upholder (N 99) (lost 14 Apr 1942)
HMS Upright (N 89)
HMS Urge (N 17) (lost 6 May 1942)
HMS Usk (i) (N 65) (lost 3 May 1941)
HMS Utmost (N 19) (lost 25 Nov 1942)