USS Porpoise (SS-172); USS Pike (SS-173); USS Shark (SS-174); USS Tarpon (SS-175); USS Perch (SS-175); USS Pickerel (SS-177); USS Permit (SS-178); USS Plunger (SS-179); USS Pollack (SS-180); USS Pompano (SS-181)
Traveling under the surface to search, track, and / or engage or reconnoiter areas.
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.
1935: 4 x Winton Model 16-201A 16-cylinder, 2-cycle, diesel-fueled engines developing 1,300 shaft horsepower; 2 x 120-cell Exide VL31B batteries driving 4 x Elliott electric motors at 1,075 shaft horsepower; 1942 REFIT: 4 x General Motors 2-cycle Model 12-278A diesel engines developing 1,200 horsepower; 2 x Shafts.
(6,900 miles | 11,104 km)
1 knot = 1.15 mph; 1 nm = 1.15 mile; 1 nm = 1.85 km
6 x 21" (533mm) torpedo tubes (4 facing forward and 2 facing aft). 16 x total torpedoes. Additional 2 x tubes added in 1942.
1 x 3" (76mm) /50 cal deck gun
2 x 0.30 caliber anti-aircraft machine guns