Lagrange-class submarine
From Wikipedia, the free encyclopedia
 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 | |
| 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 |
|
| Speed |
|
| Range |
|
| Test depth | 50 m (160 ft) |
| Complement | 47 |
| Armament |
|
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.
The Lagrange-class submarines were constructed as part of the French fleet's expansion programmes from 1913 to 1914.[1] The ships were designed by Julien Hutter, who slightly modified his previous project, the Dupuy de Lôme-class submarines, using two Parsons steam turbines with a power of 2,000 hp (1,491 kW).[2] During construction, though, the idea was abandoned and the ships were instead equipped with diesel engines.[1][2]
75.2 m (246 ft 9 in) long, with a beam of 6.3 m (20 ft 8 in) and a draught of 3.6 m (11 ft 10 in),[1] Lagrange-class submarines could dive up to 50 m (164 ft). The submarines had a surfaced displacement of 920 long tons (935 t) and a submerged displacement of 1,318 long tons (1,339 t).[1] Propulsion while surfaced was provided by two 2,600 hp (1,939 kW) diesel motors built by Swiss manufacturer, Sulzer, and two 1,640 hp (1,223 kW) electric motors.[2][3] The submarines' electrical propulsion allowed them to attain speeds of 11 knots (20 km/h; 13 mph) while submerged and 16.5 knots (30.6 km/h; 19.0 mph) on the surface.[1][2] They had surfaced range of 4,300 nautical miles (8,000 km) at 10 knots (19 km/h) and a submerged range of 125 nautical miles (232 km) at 5 knots (9.3 km/h).[1][2]
The ships were equipped with eight 450 millimetres (18 in) torpedo tubes (four in the bow; two stern and two external), with a total of ten torpedoes and two 75 millimetres (3.0 in) guns.[2][3] The crew of a ship comprised forty-seven men.[2][3][4]