French submarine Regnault

The French submarine Regnault (Q113) was a built for the French Navy built between 1913 and 1924. It was laid down in the Toulon Arsenal shipyards and launched on June 25, 1924. Regnault was completed in 1924 and served in the French Marine Nationale until 1937.

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 2000 hp. During construction, though, the idea was abandoned and the ships were instead equipped with diesel engines.

75.2 m long, with a beam of 6.3 m and a draught of 3.6 m, Lagrange-class submarines could dive up to 50 m. The submarine had a surfaced displacement of 920 t and a submerged displacement of 1318 t. Propulsion while surfaced was provided by two 2600 hp diesel motors built by the Swiss manufacturer Sulzer and two 1640 hp electric motors. The submarines' electrical propulsion allowed it to attain speeds of 11 kn while submerged and 16.5 kn on the surface. Their surfaced range was 7700 nmi at 9 kn, and 4000 nmi at 12 kn, with a submerged range of 70 nmi at 5 kn.

The ships were equipped with eight 450 mm torpedo tubes (four in the bow, two stern and two external), with a total of 10 torpedoes and two on-board guns. The class was also armed with a 75 mm gun with an ammo supply of 440 bullets. The crew of one ship consisted of four officers and 43 of officers and seamen.

Service history
Regnault was built in the Toulon Arsenal. It was laid down in 1913, launched on 25 June 1924, and completed in 1924. It was named in honor of the distinguished French nineteenth-century chemist Henri Victor Regnault. Regnault served in the Mediterranean Sea until 1935.