French submarine Y

The French submarine "Y" was a single-hull experimental submarine designed by Louis-Émile Bertin for the French Navy. She was launched in July 1905 but was never commissioned and remained in experimental status. A planned refit, which included adding an electric motor for underwater propulsion in 1907 was cancelled. "Y" was disarmed and stricken on 1 March 1909.
Design.
"Y" was long, with a beam of and a draught of . The submarine had a surfaced displacement of and a submerged displacement of . The submarine was powered by a diesel engine for both surface and submerged running. She had a maximum speed of on the surface and while submerged. She had a complement of 15 men.
Her armament comprised two bow torpedo tubes, two Drzewiecki drop collar torpedo launchers and one external cradle aft .
Construction and career.
"Y" was laid down in the Arsenal de Toulon, launched on 24 July 1905 and completed in 1906. "Y" was a single-hull diesel design by Louis-Émile Bertin. "Y" received the pennant number Q 37 and cost F924,300.
"Y" was used for trials and experiments and never commissioned into the French "Marine Nationale". In 1907, a reconstruction was proposed to install an electric motor and batteries for submerged running, but eventually the idea was abandoned. "Y" was disarmed and stricken in May 1909.