Mark 46 torpedo

Mk 46 is also the designation of the Mk 46 Mod 0 variant of the M249 light machine gun
Mark 46 torpedo

A Mk 46 exercise torpedo launched from USS Mustin.
Type Lightweight antisubmarine torpedo[1]
Place of origin United States
Service history
In service • Mod 0: 1963[1]
• Mod 5: 1979
Used by See operators
Production history
Designer Naval Ordnance Test Station Pasadena[1]
Alliant Techsystems
Designed 1960[1]
Manufacturer Aerojet[1]
Naval Ordnance Station Forest Park
Variants Mod 0[1]
Mod 1
Mod 2
Mod 5
Mod 5A
Mod 5A(S)
Mod 5A(SW)[2]
Weight 508 lb (230.4 kg)
Length 8 ft 6 in (2.6 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 (10,972.8 m)
Maximum depth >1,200 ft (365.8 m)
Speed >40 kn (74.1 km/h; 46.0 mph)
Active or passive/active Acoustic homing
Mark 32 Surface Vessel Torpedo Tubes, ASW Aircraft, RUM-139 VL-ASROC
A Mark 46 Mod 5A torpedo is inspected aboard the guided missile destroyer USS Mustin.
A French Lynx. helicopter carrying a Mk 46 torpedo.

The Mark 46 torpedo is the backbone of the United States Navy's lightweight anti-submarine warfare torpedo inventory, and is the current NATO standard. These aerial torpedoes are designed to attack high-performance submarines, and current variants, such as the Mark 46 Mod 5, are expected to remain in service until 2015. In 1989, a major upgrade program for the Mod 5 began to improve its shallow-water performance, resulting in the Mod 5A and Mod 5A(S).

Design details

Mark 46, Mod 5

Yu-7 variant

The Chinese Yu-7 torpedo is said to be based on the Mk 46 Mod 2.[5] Currently, the Chinese Navy use the Yu-7 ASW torpedo, deployed primarily on ships and ASW helicopters.[6]


Map with former Mark 46 operators in red

See also


  1. 1 2 3 4 5 6 7 Jolie, E.W. (15 September 1978). "A Brief History of US Navy Torpedo Development: Torpedo Mk46". Retrieved 24 June 2013.
  2. 1 2 "The US Navy Fact File: Mark 46 Torpedo". 27 November 2012. Retrieved 24 June 2013.
  3. 1 2 3 4 5 6 7 Thomas, Vincent C. The Almanac of Seapower 1987 Navy League of the United States (1987) ISBN 0-9610724-8-2 pp.190-191
  4. 1 2 3 Polmar, Norman "The Ships and Aircraft of the U.S. Fleet: Torpedoes" United States Naval Institute Proceedings November 1978 p.160
  5. Chinese Defence Today, “YU-7 Anti-Submarine Torpedo”
  6. (Chinese language)
  7. Weapon - Mk. 46 torpedo
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