Editing Sturgeon-class submarine (section)

==Design==
[[File:USS PARGO Sturgeon Class.jpg|thumb|left|Control room]]
The ''Sturgeon''s were essentially lengthened and improved variants of the [[Thresher/Permit-class submarine|''Thresher/Permit'' class]] that directly preceded them.  The five-compartment arrangement of the ''Permit''s was retained, including the bow compartment, operations compartment, reactor compartment, auxiliary machinery room no. 2, and the engine room. The extra length was in the operations compartment, including longer torpedo racks to accommodate additional [[Mark 37 torpedo]]es, the most advanced in service at the time of the class's design in the late 1950s. The class was redesigned to [[SUBSAFE]] requirements concurrently with the construction of the first units, with seawater, main ballast, and other systems modified for improved safety.<ref name="auto"/> The biggest difference was the much larger sail, which permitted a second periscope and additional intelligence-gathering masts, and which reduced the risk of the submarine [[Broach (nautical)|broaching]] the surface in heavy seas.  The [[fairwater plane]]s mounted on the sail could rotate 90&nbsp;degrees, allowing the submarine to surface through thin ice.<ref name="auto"/> Because the [[S5W reactor]] was used (the same as in the ''Skipjack''s and ''Thresher/Permit''s), the sail was enlarged (increasing [[Drag (physics)|drag]]), and the displacement was increased, the ''Sturgeon''s' top speed was {{convert|26|kn|km/h}}, 2&nbsp;knots slower than the ''Thresher/Permit''s.
The last nine ''Sturgeon''s were lengthened {{convert|10|ft|0}} to provide more space for electronic equipment and habitability. The extra space also helped facilitate the use of [[dry deck shelter]]s first deployed in 1982.

The class received mid-life upgrades in the 1980s, including the BQQ-5 sonar suite with a retractable [[towed array sonar|towed array]], Mk 117 torpedo fire control equipment, and other electronics upgrades.
[[File:USS Pargo (SSN-650).jpg|left|200px|thumb|{{USS|Pargo|SSN-650}} surfaced in Arctic ice.]]