home

fighting ships of the world

ROYAL NAVY - UNITED KINGDOM

SUBMARINES

GRAMPUS submarines (1936 - 1939)

Grampus 1939

Name No Builder Laid down Launched Comp Fate
Grampus M56 - N56 Chatham DYd 8/1934 25/2/1936 3/1937 sunk 16/6/1940
Narwhal M45 - N45 Vickers-Armstrong, Barrow 5/1934 29/8/1935 2/1936 sunk 30/7/1940
Rorqual M74 - N74 Vickers-Armstrong, Barrow 5/1935 21/7/1936 2/1937 BU 3/1946
Cachalot M83 - N83 Scotts, Greenock 5/1936 2/12/1937 8/1938 sunk 30/7/1941
Seal M37 Chatham DYd 12/1936 27/9/1938 5/1939 captured by Germany 30/5/1940 (UB)
P411   Scotts, Greenock 1941 --- --- cancelled 9/1941
P412   Scotts, Greenock 1941 --- --- cancelled 9/1941
P413   Scotts, Greenock 1941 --- --- cancelled 9/1941

 

Displacement standard, t

1520

Displacement normal, t

1810 / 2157

Length, m

89.3

Breadth, m

7.77

Draught, m

5.13

No of shafts

2

Machinery

2 Admiralty diesels / 2 electric motors

Power, h. p.

3300 / 1630

Max speed, kn

15.75 / 8.75

Fuel, t

diesel oil 119 - 147

Endurance, nm(kts)

5880(9.3) / 64(4)

Armament

6 - 533 TT (bow; 12), 1 x 1 - 102/40 QF Mk XII, 50 M3 mines

Sensors sonar

Complement

59

Diving depth operational, m 60

Ship project history: Unique British purpose-built minelaying submarines. Porpoise was built under the 1930 program. Design was created on basis of "" class. Saddle-tank submarine had an operational diving depth 60m, maximal depth 95m. Fuel tanks out of a pressure hull were welded. Two horizontal mine tubes placed in a superstructure and extended from an aft end in a bow on about 70m.

After a lead boat 5 more were followed (1932-1935 programs), built on changed design. They had double-hulled construction similar accepted on Thames class fleet submarines. Hull lines which have streamlined at the expense of this decision allowed  to raise speed a little at same engine power. Fuel tanks have placed in a pressure hull, the truth, for it was necessary to pay by reduction of fuel stowage.

Already after a beginning of war, under the "War emergency" program it was decided to built 3 more submarines of this class and in January, 1941 even the order has been given out. Soon, however, it have cancelled, as necessity in specialised minelayer has disappeared after working out of the special mines put through TT.

Modernizations: 1940s, Rorqual: can carry 12 M2 mines in TT instead of torpedoes

1942 - 1943, Rorqual: + 1 x 1 - 20/70 Oerlikon Mk II/IV

1/1946, Rorqual: 1 x 1 - 102/40 S Mk I, 1 x 1 - 20/70 Mk IIA S/M, 6 - 533 TT, 50 mines

Naval service: One of submarines, Seal, has appeared the unique British ship which has surrendered to the enemy (4/5/1940 was mined in Skagerrak, badly damaged and surrendered to German patrol ships; subsequently she served in German navy as UB; she was scuttled 3/5/1945). Grampus was sunk by DCs of Italian torpedo boats Circe and Clio at coast of Sicily 16/6/1940. Narwhal was sunk by German aircraft at coast of Norway 30/7/1940. Cachalot was sunk by ramming of Italian torpedo boat Generale Achille Papa at Bengasi 30/7/1941.

Ivan Gogin, 2008-10