Narwhal Class Specifications

Lead Boat: SS-167, U.S.S. Narwhal
Length: 371′
Beam: 33′ 3″
Draft: 16′ 11″ (Surface trim)
Displacement: 2,730 tons (surfaced); 3,960 tons (submerged)
Speed: 17 knots (surfaced); 8-1/2 knots (submerged)
Diving Depth: 300′ (test depth)
Range: 25,000 miles
Crew: 9 officers, 10 CPO, 70 enlisted
Deck Gun: 2-6″/53-caliber
Torpedoes: 4-21″ torpedo tubes (bow), 2-21″ torpedo tubes (stern)
Engines: 2-2,350 hp diesel; 2-450 hp diesel generator
Motors: 2-800 hp
Wartime Modifications: Both converted to transport submarines.