Aigrette-class submarine

The Aigrette-class submarines were a class of two submarines built for the French Navy between 1903 and 1905. They were essentially experimental submarines, and although in service during World War I, saw no action. The class was designed by Maxime Laubeuf and used Drzewiecki drop collar external torpedoes.

Design
35.9 m long, with a beam of 4.04 m and a draught of 2.63 m, Aigrette-class submarines could dive up to 30 m. The submarine had a surfaced displacement of 178 t and a submerged displacement of 153 t. Propulsion while surfaced was provided by one 150 hp diesel motor and one 130 hp electric motor. The submarines' electrical propulsion allowed it to attain speeds of 6.2 kn while submerged and 9.3 kn on the surface. Their surfaced range was 1300 nmi at 8 kn with a submerged range of 65 nmi at 3.8 kn.