The Mark 11 torpedo was the first American torpedo to be designed within the United States Navy without collaboration from industry.^[1] It was developed by the Washington Navy Yard in Washington, D.C., and the Naval Torpedo Station in Newport, Rhode Island. The Mark 11 torpedo was also the first to feature a three-speed setting capability while tube-loaded: high at 46 knots, medium at 34 knots and low at 27 knots. Due to stability problems it was supplemented by the Mark 12 torpedo within two years, which had a 44-knot high speed setting.

Mark 11 torpedo
The Mark 11 torpedo at Newport, Rhode Island, torpedo factory, June 1925.
Type	Anti-surface ship torpedo[1]
Place of origin	United States
Service history
In service	1926–1945
Used by	United States Navy
Wars	World War II
Production history
Designer	Washington Navy Yard[1] Naval Torpedo Station
Designed	1926[1]
Manufacturer	Naval Torpedo Station[1]
Variants	Mod 1[2]
Specifications
Mass	3511 pounds[1]
Length	271 inches[1]
Diameter	21 inches[1]
Effective firing range	6000-15,000 yards[1]
Warhead	Mk 11, TNT[1]
Warhead weight	500 pounds[1]
Detonation mechanism	Mk 3, Mod 1 contact exploder[1]
Engine	Turbine[1]
Maximum speed	27-46 knots[1]
Guidance system	Gyroscope[1]
Launch platform	Destroyers[1]