Gustave Zédé-class submarine

Class overview
A Gustave Zédé-class submarine in the background behind the ex-German SMS U-139 in French service as Halbronn, Brest, France, February 1919
Name:	Gustave Zédé
Builders:	Arsenal de Cherbourg
Operators:	French Navy
Preceded by:	Clorinde class
Succeeded by:	Amphitrite class
Built:	1911–16
In commission:	1914–37
Completed:	2
Scrapped:	2
General characteristics (as built)
Type:	Submarine
Displacement:	820–849 t (807–836 long tons) (surfaced) 1,047–1,098 t (1,030–1,081 long tons) (submerged)
Length:	74 m (242 ft 9 in) (o/a)
Beam:	6 m (19 ft 8 in) (deep)
Draft:	3.75 m (12 ft 4 in)
Installed power:	1,640 PS (1,210 kW; 1,620 bhp) (electric motors) 3,500 PS (2,600 kW; 3,500 bhp) (Du Temple boilers) or 2,400 PS (1,800 kW; 2,400 bhp) (diesels)
Propulsion:	2 × shafts; 2 × electric motors 2 × Diesel engines or 2 × Vertical triple-expansion steam engines
Speed:	17 knots (31 km/h; 20 mph) (surfaced) 10–11 knots (19–20 km/h; 12–13 mph) (submerged)
Range:	1,400–3,120 nmi (2,590–5,780 km; 1,610–3,590 mi) at 10 knots (19 km/h; 12 mph) (surfaced) 90–135 nmi (167–250 km; 104–155 mi) at 4–5 knots (7.4–9.3 km/h; 4.6–5.8 mph) (submerged)
Complement:	47 officers and crewmen
Armament:	2 × 450 mm (17.7 in) bow torpedo tubes 3 × twin external 450 mm torpedo launchers

The Gustave Zédé class was a pair of submarines built for the French Navy just before World War I.