Norwegian A-class submarine

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HNoMS A-4
Class overview
Builders	Krupp Germania Kiel, Germany
Operators	Royal Norwegian Navy
Preceded by	HNoMS Kobben (1909)
Succeeded by	B class
In service	– 16 April 1940
In commission	2 March 1914
Planned	4
Building	4
Completed	4
Lost	3
General characteristics
Type	Submarine
Displacement	270 t (270 long tons) ↑ 342 t (337 long tons) ↓
Length	46.7 m (153 ft 3 in)
Beam	4.78 m (15 ft 8 in)
Draught	2.8 m (9 ft 2 in)
Propulsion	2 × vertical 700 shp (520 kW) diesel engines 2 × 380 shp (280 kW) electric engines
Speed	14.2 kn (26.3 km/h; 16.3 mph) ↑ 9 knots (17 km/h; 10 mph) ↓
Range	1,600 nmi (3,000 km; 1,800 mi) at 9 knots (17 km/h; 10 mph) ↑ 100 nmi (190 km; 120 mi) at 3 knots (5.6 km/h; 3.5 mph) ↓
Test depth	50 m (164 ft)
Boats & landing craft carried	1 dingi
Complement	16 (? officers and ? ratings)
Armament	3 × 45 cm (18 in) torpedo tubes 1 × 76 mm gun

The A-class submarines were a class of three vessels of German design built by the Krupp Germania naval shipyard in Kiel, Germany from 1913 to 1914 and deployed by the Royal Norwegian Navy.

The Norwegian government purchased four submarines that were almost completed in 1913 and received three of these before World War I. The fourth, A-5, was seized by German authorities at the outbreak of war and commissioned as SM UA. It was used for coastal protection and from 1916 as a training vessel in the Baltic Sea.^[1]