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 21in torpedo tubes (6 bow, 2 stern 14 torpedoes) 1 - 4.7 in 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 inch 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