Grampus-class submarine

	HMS Porpoise
Class overview
Name	Grampus class
Operators	Royal Navy Kriegsmarine
Preceded by	River class
Succeeded by	T class
In commission	1933—1945
Completed	6
Lost	5
Retired	1
General characteristics
Type	Submarine
Displacement	1,810 tons surfaced; 2,157 tons submerged;
Length	293 ft (89 m)
Beam	25 ft 6 in (7.77 m)
Draught	16 ft 10 in (5.13 m)
Propulsion	2 shaft, diesel (3,300 hp; 2,500 kW) plus electric (1,630 hp; 1,220 kW)
Speed	15.5 knots (28.7 km/h; 17.8 mph) surfaced; 8.75 knots (16.21 km/h; 10.07 mph) submerged;
Complement	59
Armament	6 × 21 in torpedo tubes (bow); 12 torpedoes; 1 × QF 4-inch (101.6 mm) Mk XII deck gun; 50 mines;

The Grampus-class submarines were a group of minelaying submarines built for the Royal Navy in the late 1930s. These boats are sometimes referred to as the Porpoise class from the single prototype, HMS Porpoise built in 1932. Five boats to a modified design were built between 1936 and 1938. The ships were all named after marine mammals.

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