|Mark 46 torpedo|
A Mk 46 exercise torpedo launched from USS Mustin.
|Type||Lightweight antisubmarine torpedo|
|Place of origin||United States|
|In service||o Mod 0: 1963|
o Mod 5: 1979
|Used by||See operators|
|Designer||Naval Ordnance Test Station Pasadena|
Naval Ordnance Station Forest Park
|Mass||508 lb (230 kg)|
|Length||8 ft 6 in (2.59 m)|
|Diameter||12.75 in (323.8 mm)|
|Warhead||PBXN-103 high explosive (bulk charge)|
|Warhead weight||96.8 lb (43.9 kg)|
|Engine||Two-speed, reciprocating external combustion|
|Propellant||Otto fuel II|
|12,000 yd (10,973 m)|
|Maximum depth||>1,200 ft (366 m)|
|Speed||>40 kn (74 km/h; 46 mph)|
|Active or passive/active acoustic homing|
|Mark 32 Surface Vessel Torpedo Tubes, ASW Aircraft, RUM-139 VL-ASROC|
The Mark 46 torpedo is the backbone of the United States Navy's lightweight anti-submarine warfare torpedo inventory and is the NATO standard. These aerial torpedoes are designed to attack high-performance submarines. In 1989, an improvement program for the Mod 5 to the Mod 5A and Mod 5A(S) increased its shallow-water performance. The Mark 46 was initially developed as REsearch TORpedo Concept I (RETORC I), one of several weapons recommended for implementation by Project Nobska, a 1956 summer study on submarine warfare.
The Chinese Yu-7 torpedo is said to be based on the Mk 46 Mod 2. The Chinese Navy used the Yu-7 ASW torpedo, deployed primarily on ships and ASW helicopters, but it started to be replaced by the Yu-11 in 2012.