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Definitions of “beam,” “draft,” “displacement”

1976: Los Angeles Class (U.S.)
The Sub Hunters


US Los Angeles Class
The submarine Los Angeles
Photograph courtesy U.S. Navy

The Los Angeles class, with 62 vessels, is the world’s largest series of nuclear-propelled submarines. Like its predecessor the Sturgeon class, the quieter and faster Los Angeles class was designed primarily to protect carrier battlegroups by targeting enemy subs.

Los Angeles-class subs are also capable of a variety of other missions, such as deploying Special Forces (cross-military divisions formed to accomplish especially difficult tasks) and attacking land targets. Some Los Angeles-class subs are modified for improved under-ice operations.

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Length: 360 ft (109 m)

Beam: 33 ft (10 m)

Draft: 31 ft (9 m)

Displacement: approx. 6,000 tons

Propulsion: 1 pressurized-water nuclear reactor, 1 propeller

Crew: 129

Armament: Tomahawk cruise missiles, 4 21-inch (533-mm) torpedo tubes, mines

First Sub Commissioned: November 13, 1976

Maximum Speed: Approx. 20+ knots (23+ mph/37+ kph)