Norwegian B-class submarine

	The B-class submarines B-2, B-3 and B-4 at quay in Norway
Class overview
Builders	Karljohansvern Naval shipyard
Operators	Royal Norwegian Navy
Preceded by	A class
Succeeded by	U class
In service	1923 – 1946
In commission	1 February 1923
Completed	6
Lost	1
Retired	5
General characteristics
Type	Submarine
Displacement	365 tons surfaced; 545 tons submerged;
Length	51 m (167 ft)
Beam	5.3 m (17 ft)
Draught	3.5 m (11 ft)
Propulsion	2 × Sulzer 900 shp (670 kW) diesel engines; 2 × 700 shp (520 kW) electric engines;
Speed	15 knots (28 km/h) surfaced; 8.9 knots (16.5 km/h) dived;
Range	2,900 nmi (5,400 km) at 9 kn (17 km/h) surfaced; 150 nmi (280 km) at 3 kn (5.6 km/h) submerged;
Complement	23
Armament	4 × 45 cm (18 in) torpedo tubes; 1 × 76 mm (3.0 in) gun;

The B-class submarines were a class of six vessels of the US L class built on licence at Karljohansvern naval shipyard in Horten, Norway from 1922 to 1929 and deployed by the Royal Norwegian Navy.

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