French submarine X

X was a steel single hull submarine built for the French Navy between 1904 and 1905. She was launched in November 1904 and commissioned in 1905. Gaston Romazzotti modified the design of to create an experimental submarine which was the first with twin shafts.
Design.
"X" was an experimental submarine designed by Gaston Romazzotti based on the previous . Steel was used to construct the single hull and she was the first submarine to have twin shafts. The submarine had a surfaced displacement of and a submerged displacement of . Her dimensions were long, with a beam of and a draught of . "X" had two shafts powered by two gasoline engines for surface running with a combined total of and two electric motors which together produced for submerged propulsion. Her maximum speed was on the surface and while submerged with a surfaced range of at and a submerged range of at . Her complement was 15 men.
Her armament comprised one bow torpedo tube, two Drzewiecki drop collar torpedo launchers and a external cradle for one torpedo. In total six torpedoes were carried.
Construction and career.
"X" was laid down in the Arsenal de Cherbourg, launched on 15 November 1904 and completed in 1905. The submarine received the pennant number Q 35 at her commissioning and cost just under half a million Francs.
On 13 February 1911, "X" was renamed "Dauphin". "Dauphin" served in the English Channel until 21 May 1914, when she was struck from the Navy List.