| Class name | No. | Laid down | Last comm. | Notes |
|---|---|---|---|---|
| R | 20 | 1917 | 1918 | Known as a "pig boat", or "boat", due to foul living conditions and unusual hull shape. Designed by Simon Lake. Larger conning tower to serve as commanding officer's battle station. Fired Mk10 torpedoes and traveled 5,000 miles (8,000 km) at 10 knots (5.1 m/s). |
| R-21 | 7 | 1917 | 1919 | Similar to R-class. Known as a "pig boat", or "boat", due to foul living conditions and unusual hull shape. |
| S | 51 | 1917 | 1922 | The S class is subdivided into four groups of different designs. |
Read more about this topic: List Of Submarine Classes Of The United States Navy
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