Allied Warships


Porpoise class

6 ships

The submarine HMS Cachalot (N 83) of the Royal Navy. She was lost on 30 Jul 1941.

Technical information

Displacement1520 / 2157 BRT 
Length289 feet 
Complement6 officers + 53 men 
Armament1 4" gun
6 21" torpedo tubes (6 bow)
50 mines 
Max speed15.75 / 8.75 knots (surfaced/submerged)
EnginesDiesel / Electric, 2 shafts 
Power3300 / 1630 HP  (surfaced/submerged)
Notes on classLarge mine laying submarines. Beneath the casing ran two rails which stretched the entire length of the casing. The mines were stowed on the rails until the time of laying the minefield. The casing had large stern doors which were opened when laying the mines and the mines were strewn through these stern doors.

HMS Porpoise (the first one of the class built) same specifications as above except;
Displacement: 1500 / 2053 BRT
Lenght: 288 feet.

Submarines of this class that have detailed patrol info added are shown in bold in the list below.


All ships of the Porpoise class

Royal Navy Royal Navy (more on Royal Navy)

HMS Cachalot (N 83) Lost on 30 Jul 1941
HMS Grampus (N 56) Lost on 16 Jun 1940
HMS Narwhal (N 45) Lost on 23 Jul 1940
HMS P 411 (P 411)
HMS P 412 (P 412)
HMS P 413 (P 413)
HMS Porpoise (N 14) Lost on 11 Jan 1945
HMS Rorqual (N 74)
HMS Seal (37 M)

6 Submarines of the Porpoise class. 4 of them were lost.

Strikeout means that ship was cancelled (not finished) - not counted in class figures.

Full wartime service history on this vessel.

See all Submarine classes.

Books dealing with this subject include:

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