Capitan O'Brien-class submarine (1928)

Class overview
Builders:	Vickers
Operators:	Chilean Navy
In commission:	1929–1958
Completed:	3
Retired:	3
General characteristics
Displacement:	Surfaced - 1540 tons; Submerged - 2020 tons;
Length:	260 ft (79 m)
Beam:	28 ft (8.5 m)
Draught:	13 ft 6 in (4.11 m)
Propulsion:	2 shaft diesel electric ; Vickers diesels: 2,750 hp (2,050 kW); Electric motors: 1,300 hp (970 kW);
Speed:	Surfaced: 15 kn (28 km/h; 17 mph) ; Submerged: 9 kn (17 km/h; 10 mph);
Crew:	54
Armament:	Eight 21 inch (533 mm) torpedo tubes (6 bow, 2 stern 14 torpedoes) 1 - 4.7 in (120 mm)/45 deck gun

The Capitan O'Brien class were three submarines built for the Chilean Navy in the late 1920s. They were similar to the contemporary British Odin class submarines, but mounted a larger 4.7 in (120 mm)/45 deck gun and were slightly smaller.

Ships

All boats were built by Vickers in Barrow-in-Furness and commissioned in 1929

Ship	Launched	Decommissioned
Almirante Simpson, named after Robert Winthrop Simpson	15 January 1928	1957
Capitan O'Brien	2 October 1928	1957
Capitan Thompson	15 January 1929	1958

The two Oberon class submarines purchased by Chile in the 1970s were also known locally as the O'Brien class.

References

Conway's All the World's Fighting Ships 1922-1946

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