Rainbow-class submarine

	HMS Regent underway
Class overview
Name	Rainbow class
Operators	Royal Navy
Preceded by	Parthian class
Succeeded by	S class
In commission	1930–1946
Planned	6
Completed	4
Cancelled	2
Lost	3
Retired	1
General characteristics
Type	Submarine
Displacement	1,763 long tons (1,791 t) surfaced; 2,030 long tons (2,060 t) submerged;
Length	287 ft (87 m)
Beam	30 ft (9.1 m)
Draught	16 ft (4.9 m)
Propulsion	Diesel-electric; 2 × Admiralty diesel engines, 4,640 hp (3,460 kW); 2 × electric motors, 1,635 hp (1,219 kW); 2 shafts;
Speed	17.5 knots (20.1 mph; 32.4 km/h) surfaced; 8.6 kn (9.9 mph; 15.9 km/h) submerged;
Complement	53
Armament	8 × 21 inch (533 mm) torpedo tubes (6 bow, 2 stern) with 14 reloads; 1 × QF 4.7-inch (120 mm) Mark IX deck gun; After 1942 :; 2 × 20 mm cannon; Equipped to lay mines through torpedo tubes;

The Rainbow-class submarine or R class was a quartet of patrol submarines built for the Royal Navy in the early 1930s.

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