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fighting ships of the world

ROYAL NAVY - UNITED KINGDOM

SUBMARINES

UNDINE ("U" prewar programs) submarines (1938)

Undine 1939

Name No Builder Laid down Launched Comp Fate
Undine C48 Vickers-Armstrong, Barrow 2/1937 5/10/1937 8/1938 sunk 7/1/1940
Unity C66 Vickers-Armstrong, Barrow 2/1937 16/2/1938 12/1938 collision 29/4/1940
Ursula S65 - N65 Vickers-Armstrong, Barrow 2/1937 16/2/1938 12/1938 to Soviet Union 5/1944 - 2/1949 (-4) (V-4), BU 5/1950

 

Displacement standard, t

540

Displacement normal, t

630 / 730

Length, m

58.2

Breadth, m

4.90

Draught, m

4.62

No of shafts

2

Machinery

2 Paxman-Ricardo diesel-generators , 2 electric motors

Power, h. p.

615 / 825

Max speed, kn

11.25 / 10

Fuel, t

diesel oil 38

Endurance, nm(kts)

4050(10) /

Armament

6 - 533 TT (4 bow, 2 ext bow, 10), 3 x 1 - 12.7/62

Ursula: 6 - 533 TT (4 bow, 2 ext bow, 8), 1 x 1 - 76/45 20cwt QF Mk II, 3 x 1 - 12.7/62

Sensors sonar

Complement

27

Diving depth operational, m 60

Ship project history: These submarines were originally reflected as unarmed targets for training of crews of escort ships. Already after design approval it was decided to arm them with TT. Construction of a fore end was changed for placing 4 TT in pressure hull and two more out of it, in a special fin. Single-hulled. Feature of this class that there on shafts only electric motors were and diesels used only in a role of generators. There were first British pure diesel-electric submarines.

New boats received a designation as "U" class, have appeared very successful, and better than boats of other types approached for actions in Mediterranean and Northern seas, however originally a series have limited to three units of the 1936 program.

Modernizations: about 1942 - 1943, Ursula: can carry 6 M2 mines instead of torpedoes

2/1949, Ursula: 1 x 1 - 76/45 CP Mk V, 6 - 533 TT

Naval service: Undine was sunk 7/1/1940 in North Sea by DCs of German minesweepers 1201, 1204 and 1207. Unity was lost 29/4/1940 at collision with s/s Atle Jarl in the North Sea.

Ursula 1940

Ivan Gogin, 2008-13