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→Boats in class: When we talk about submarines vessels are called BOATS not SHIPS. Tags: Mobile edit Mobile web edit |
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The engine room of {{USS|Jack|SSN-605|2}} was lengthened by {{convert|10|ft|m}} to accommodate an experimental [[direct drive|direct-drive]] propulsion system using concentric counter-rotating propellers. Although counter-rotating propellers produced impressive gains in speed on the experimental {{USS|Albacore|AGSS-569|2}}, in ''Jack'' the results were disappointing because of the difficulty in sealing the shaft. ''Jack'' was also used to test polymer ejection that could reduce flow noises that degraded sonar performance.{{citation_needed|date=August 2019}}
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The gaps in the hull number sequence were taken by the unique {{USS|Tullibee|SSN-597|2}}, and the {{sclass|George Washington|submarine|5}}, {{sclass|Ethan Allen|submarine|5}}, and {{sclass|Lafayette|submarine|0}} fleet ballistic missile submarine classes.{{citation_needed|date=August 2019}}
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