The submarine HMS Cachalot (N 83) of the Royal Navy. She was lost on 30 Jul 1941.
Technical information
| Type | Submarine |
| Displacement | 1520 / 2157 BRT |
| Length | 289 feet |
| Complement | 6 officers + 53 men |
| Armament | 1 4" gun 2 MG AA 6 21" torpedo tubes (6 bow) 50 mines |
| Max speed | 15.75 / 8.75 knots (surfaced/submerged) |
| Engines | Diesel / Electric, 2 shafts |
| Power | 3300 / 1630 HP (surfaced/submerged) |
| Notes on class | Large 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
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 | 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 | ||
| HMS | ||
| HMS | ||
| HMS Porpoise (N 14) | Lost on 11 Jan 1945 | |
| HMS Rorqual (N 74) | ||
| HMS Seal (37 M) | ||
Full wartime service history on this vessel. | ||
Royal Navy (more on See all Submarine classes.
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Books dealing with this subject include:
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