Émeraude-class submarine (1906)

{{Infobox ship }} }} {{ The Émeraude-class submarines was a group of six submarines built for the French Navy during the first decade of the 20th century. One boat was sunk and another captured during the First World War and the survivors were scrapped after the war.
 * Ship image=Emeraude-Agence Rol.jpeg
 * Ship caption=Émeraude in Cherbourg harbour, 31 July 1909
 * module={{Infobox ship class overview|embed=yes
 * Name= Émeraude-class
 * Builders=
 * Operators={{navy|FRA}}
 * Class before={{ship|French submarine|Oméga||2}}
 * Class after=Circé class
 * Cost=
 * Built range= 1903–10
 * In service range=
 * In commission range=1908–21
 * Total ships completed=6
 * Total ships lost=2
 * Total ships scrapped=4
 * module2={{Infobox ship characteristics|embed=yes
 * Hide header=
 * Header caption=(as built)
 * Ship type=Submarine
 * Ship displacement=*{{Convert|394|t|LT|0|abbr=on}} (surfaced)
 * {{Convert|427|t|LT|0|abbr=on}} (submerged)
 * Ship length={{convert|44.9|m|ftin|abbr=on}} (o/a)
 * Ship beam={{convert|3.9|m|ftin|abbr=on}}
 * Ship draft={{convert|3.8|m|ftin|abbr=on}}
 * Ship power=*{{convert|600|PS|kW bhp|lk=on|abbr=on}} (diesels)
 * 600 PS (electric motors)
 * Ship propulsion=*2 × shafts; 2 × diesel engines
 * 2 × electric motors
 * Ship speed=*{{convert|11.25|kn|lk=in}} (surfaced)
 * {{convert|8.5|kn}} (submerged)
 * Ship range=*{{convert|2000|nmi|abbr=on|lk=in}} at {{convert|7.3|kn}} surfaced
 * {{convert|100|nmi|abbr=on}} at {{convert|5|kn}} submerged
 * Ship test depth={{convert|40|m|ft|abbr=on}}
 * Ship complement=2 officers and 23 crewmen
 * Ship armament=6 × {{convert|450|mm|in|1|abbr=on}} torpedo tubes (4 × bow, 2 × stern)

General characteristics
The Émeraude class were built as part of the French Navy's 1903 building programme to a Maugas design. They had a single hull, and a displacement of 392 tons surfaced (425 tons submerged). For surface propulsion the Émeraude class had petrol engines, and electric motors for when submerged, giving an surface endurance of 2000 miles at 7.3 knots and a submerged endurance of 100 miles at 5 knots, with a maximum surface speed of 11.5 knots, and a submerged speed of 9.2 knots. Their armament was six torpedo tubes (4 forward and 2 aft). Topaze and Turquoise had a single 37mm gun, and were manned by crews of 21 men (later increased to 23 men).