French submarine Prairial

	A postcard of sister ship Monge underway before 1915
History
France
Name	Prairial
Namesake	The third month of spring in the French Republican calendar
Builder	Arsenal de Cherbourg
Laid down	1906
Launched	26 September 1908
Completed	19 June 1909
Identification	Pennant number: Q55
Fate	Sunk in a collision, 29 April 1918
General characteristics (as built)
Type	Submarine
Displacement	404 t (398 long tons) (surfaced); 553 t (544 long tons) (submerged);
Length	51.12 m (167 ft 9 in) (o/a)
Beam	4.96 m (16 ft 3 in)
Draft	3.15 m (10 ft 4 in)
Installed power	700 PS (510 kW; 690 bhp) (steam); 2 × du Temple boilers; 460 PS (340 kW; 450 bhp) (electric motors);
Propulsion	2 × shafts; 2 × triple-expansion steam engines; 2 × electric motors;
Speed	12 knots (22 km/h; 14 mph) (surfaced); 8 knots (15 km/h; 9.2 mph) (submerged);
Range	1,000 nmi (1,900 km; 1,200 mi) at 8.5 knots (15.7 km/h; 9.8 mph) (surfaced); 27 nmi (50 km; 31 mi) at 5 knots (9.3 km/h; 5.8 mph) (submerged);
Complement	2 officers and 23 crewmen
Armament	1 × 450 mm (17.7 in) bow torpedo tube (first 6 boats only); 6 × external 450 mm (17.7 in) torpedo launchers (4 × fixed, 2 × Drzewiecki drop collars);

Prairial was one of 18 Pluviôse-class submarines built for the French Navy (Marine Nationale) in the first decade of the 20th century.