USS Narwhal she had 10(ten) 21 inch tubes.
USS Narwhal SS-167
Career
USN Jack
Ordered:Laid down:
10 May 1927Launched:
17 December 1929Commissioned:
15 May 1930Fate:sold for scrapStricken:
19 May 1945General CharacteristicsDisplacement:2730 tons surfaced, 3960 tons submergedLength:371 ft (113 m)Beam:33 ft 3 in (10.1 m)Draft:15 ft 9 in (4.8 m)Speed:17 knots (31 km/h) surfaced, 8 knots (15 km/h) submergedComplement:88 officers and menArmament:2 x 6 in (152 mm) guns, 2 x .30 caliber (7.62 mm) machinegun, 10 x 21 in (533 mm) torpedo tubes