French submarine Charles Brun

	Charles Brun in Toulon roadstead, 1913
Class overview
Name	Charles Brun
Operators	French Navy
Preceded by	Amiral Bourgois
Succeeded by	Clorinde class
Built	1907–1912
Completed	1
Scrapped	1
History
France
Name	Charles Brun
Namesake	Charles Brun
Ordered	31 December 1906
Builder	Arsenal de Toulon
Laid down	4 April 1908
Launched	14 September 1910
Stricken	7 June 1920
Fate	Sold for scrap, 30 December 1920
General characteristics (as built)
Type	Submarine
Displacement	360 t (354 long tons) (surfaced); 453 t (446 long tons) (submerged);
Length	45.6 m (149 ft 7 in) (o/a)
Beam	4 m (13 ft 1 in)
Draft	3.6 m (11 ft 10 in)
Installed power	4 Maurice boilers; 1,300 PS (956 kW) (steam); 200 PS (147 kW) (electric);
Propulsion	2 shafts; 2 triple-expansion steam engines; 2 electric motors;
Speed	13.5 knots (25.0 km/h; 15.5 mph) (surfaced); 7.25 knots (13.43 km/h; 8.34 mph) (submerged);
Range	1,050 nmi (1,940 km; 1,210 mi) at 7 knots (13 km/h; 8.1 mph) (surfaced); 10.7 nmi (19.8 km; 12.3 mi) at 2.8 knots (5.2 km/h; 3.2 mph) (submerged);
Test depth	30 m (98 ft 5 in)
Complement	25
Armament	2 × 450 mm (17.7 in) bow torpedo tubes; 2 × single 450 mm Drzewiecki drop collars; 2 × single external 450 mm torpedo launchers;

Charles Brun was one of four experimental submarines ordered for the French Navy in 1906. Each boat was built to a different design and Charles Brun was intended to test a novel powerplant. Although the shore-based prototype installation was successful, it was a failure when evaluated aboard the submarine, and the boat was never commissioned for active service. Her hull was stripped of its equipment and was used to test a floating drydock in 1914. During the First World War, the hull was ordered to be converted into a water tank in 1916, but it is not certain if this was actually done before it was sold for scrap in 1920.

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