French submarine Charles Brun

Charles Brun was a submarine built for the French Navy during the first decade of the 20th century, the only boat of her class.
Construction.
"Charles Brun" was an experimental submarine ordered on 31 December 1906, she was built by the Arsenal de Toulon. Construction started in 1907 and she was launched on 14 September 1910. The trials of her experimental propulsion system were conducted between October 1910 and October 1913 when the submarine was finally completed. 
When she was completed, the submarine was long, with a beam of and a draft of . The submarine was assessed at . She had 4 du Temple boilers which were powered by oil and the engine was rated at 1,300 nhp. Her max. depth was , she could hold 24 crew and she was armed with 2 bow torpedo tubes, 2 single 450 mm Drzewiecki drop collars and 4 single external 450 mm torpedo launchers of which 2 were placed at the aft of the submarine.
Later career and decommissioning.
"Charles Brun" never entered operational service with the French Navy since she was an experimental submarine. She was decommissioned in June 1920 and sold for scrap.