Capitan O'Brien-class submarine (1928)

	Capitan Simpson
Class overview
Name	Capitan O'Brien class
Builders	Vickers
Operators	Chilean Navy
Built	1928–1929
In commission	1929–1958
Completed	3
Retired	3
General characteristics
Type	Submarine
Displacement	Surfaced - 1,540 long tons (1,560 t); Submerged - 2,020 long tons (2,050 t);
Length	260 ft (79 m) pp
Beam	28 ft (8.5 m)
Draught	13 ft 6 in (4.11 m)
Propulsion	2 shaft diesel-electric; Vickers diesel engines: 2,750 bhp (2,050 kW); Electric motors: 1,300 hp (970 kW);
Speed	Surfaced: 15 knots (28 km/h; 17 mph); Submerged: 9 knots (17 km/h; 10 mph);
Complement	54
Armament	8 × 21 in (533 mm) torpedo tubes (6 bow, 2 stern 14 torpedoes); 1 × 4.7 in (119 mm)/45 deck gun;

The Capitan O'Brien class were three submarines built for the Chilean Navy in the late 1920s. Designed and built in the United Kingdom, they were a modified design of the contemporary British Odin-class submarines. The lead boat, Capitan O'Brien, was launched on 2 October 1928 and the other two on 15 January 1929. All three submarines entered service in 1929. The three vessels remained in service until being discarded in 1957–1958.

Class overview
Capitan Simpson
Name	Capitan O'Brien class
Builders	Vickers
Operators	Chilean Navy
Built	1928–1929
In commission	1929–1958
Completed	3
Retired	3
General characteristics
Type	Submarine
Displacement	Surfaced - 1,540 long tons (1,560 t) Submerged - 2,020 long tons (2,050 t)
Length	260 ft (79 m) pp
Beam	28 ft (8.5 m)
Draught	13 ft 6 in (4.11 m)
Propulsion	2 shaft diesel-electric Vickers diesel engines: 2,750 bhp (2,050 kW) Electric motors: 1,300 hp (970 kW)
Speed	Surfaced: 15 knots (28 km/h; 17 mph) Submerged: 9 knots (17 km/h; 10 mph)
Complement	54
Armament	8 × 21 in (533 mm) torpedo tubes (6 bow, 2 stern 14 torpedoes) 1 × 4.7 in (119 mm)/45 deck gun