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

1981: Ohio Class (U.S.)
More and Longer-Range Weapons


US Ohio Class
Ohio during trials
Photograph from Bettmann/CORBIS

The larger and more capable Ohio-class submarines replaced an aging 1960s-era ballistic-missile submarine fleet. The Ohio subs carry more and longer-range weapons, operate more quietly, and dive deeper than their predecessors. Each of the 18 subs in the class is scheduled for active duty through at least 2020.

Next: First Non-U.S.
Nuclear-Powered Subs >>

Length: 560 ft (171 m)

Beam: 42 ft (13 m)

Draft: 38 ft (12 m)

Displacement: 18,750 tons

Propulsion: 1 pressurized-water nuclear reactor, 1 propeller

Crew: 163

Armament: 24 Trident missile tubes, 4 21-inch (533-mm) torpedo tubes

First Sub Commissioned: November 11, 1981

Maximum Speed: 25+ knots (29+ mph/46+ kph)