French submarine Laplace
The French submarine Laplace was a built for the French Navy built between 1913 and 1919. It was laid down in the Arsenal de Rochefort shipyards and launched on 12 August 1919. Laplace was completed in 1921 and served in the French Marine Nationale until 1935.
Design
The Lagrange-class submarines were constructed as part of the French fleet's expansion programmes from 1913 to 1914. The ships were designed by Julien Hutter, slightly modifying his previous project, using two Parsons steam turbines with a power of. During construction, the idea of steam propulsion was abandoned and the ships were instead equipped with diesel engines.Measuring long, with a beam of and a draught of, Lagrange-class submarines could dive up to. The submarine had a surfaced displacement of and a submerged displacement of. Propulsion while surfaced was provided by two diesel motors built by the Swiss manufacturer Sulzer and two electric motors. The submarines' electrical propulsion allowed it to attain speeds of while submerged and on the surface. Their surfaced range was at, and at, with a submerged range of at.
The ships were equipped with eight 450 mm torpedo tubes, with a total of ten torpedoes, and two on-board guns. The class was also armed with a 75 mm gun with 440 shells. The crew consisted of four officers and forty-three seamen.