Lagrange-class submarine

Lagrange-class submarine

Lagrange between 1922 and 1923
Class overview
Name	Lagrange class
Operators	French Navy
Preceded by	Armide class
Succeeded by	O'Byrne class
Built	1913–1924
Planned	4
Completed	4
Retired	4
General characteristics
Type	Submarine
Displacement	920 long tons (935 t) (surfaced) 1,318 long tons (1,339 t) (submerged)
Length	75.2 m (246 ft 9 in)
Beam	6.3 m (20 ft 8 in)
Draught	3.6 m (11 ft 10 in)
Propulsion	2 × diesel engines, 2,600 hp (1,939 kW) 2 × electric motors, 1,640 hp (1,223 kW)
Speed	16.5 knots (30.6 km/h) (surfaced) 11 knots (20 km/h) (submerged)
Range	4,300 nautical miles (8,000 km) at 10 knots (19 km/h) 125 nautical miles (232 km) at 5 knots (9.3 km/h) (submerged)
Test depth	50 m (160 ft)
Complement	47
Armament	8 × 450 mm (17.7 in) torpedo tubes 2 × 75 mm (3.0 in) deck guns 2 × 8 mm (0.31 in) machine guns

The Lagrange-class submarines were a class of four submarines built for the French Navy during World War I and the interwar period. Three ships of this type were built in the Arsenal de Toulon from 1913 to 1924, and one was built at the Arsenal de Rochefort shipyard. Entering the French Marine Nationale from 1918 to 1924, the submarines served until the mid-1930s.