Osetr class submarine

Russian submarine Sig
Class overview
Name:	Osetr
Builders:	Libau Arsenal, Latvia
Operators:	Imperial Russian Navy
In commission:	1905–1913
Completed:	6
Retired:	6
General characteristics
Type:	Submarine
Displacement:	153 tons surfaced 187 tons submerged
Length:	22 m
Beam:	3.6 m
Draught:	3.7 m
Propulsion:	2 shafts: petrol/ electric 240 hp/120 hp
Speed:	8.5 knots surfaced / 4.5 knots submerged
Complement:	24
Armament:	3 15 inch torpedo tubes (2 bow , 1 stern)

The Osetr class were a group of submarines built for the Imperial Russian Navy during the Russo Japanese War. The boats were ordered in the 1904 emergency programme. The boats were designed by American Engineer Simon Lake and had wheels fitted for moving around on the sea bed as well as wet/dry chambers for divers. The Osetr was the former Protector sold by Lake to the Russians and re-assembeld in Russia. The diving depth was 16 fathoms

Ships

All ships were built by the Lake company at the Libau Arsenal (Latvia) and were launched in 1904

Ship	Namesake	Service / Fate
Bychok - Бычок	Goby	Decommissioned 1913
Kefal - Кефаль	Mullet	Decommissioned 1913
Osetr - Осётр (ex Protector)	Sturgeon	Decommissioned 1913
Paltus - Палтус	Halibut	Decommissioned 1913
Plotva	Roach[citation needed]	Decommissioned 1913
Sig	Coregonus	Decommissioned 1913

References

• Conway's All the World's Fighting Ships 1906-1922