Mark 46 torpedo

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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.[1]

Design details

Variants

  • Mod 0: One of the original versions of 1960 (production started 1963). Solid propellent piston engine. Gyro/wire guidance with passive/active homing.[2]
  • Mod 1: Based on Mod 0. 1967. Uses liquid Otto fuel piston engine. Laminar search guidance.[2] Phase 1 of 1968 uses stronger hull to resist deeper waters. Phase 2 of 1971 uses a new homing program able to detect submarines near the surface.[3]
  • Mod 2: Based on Mod 1 phase 2. More powerful Mk 103 Mod 1 warhead. Improved computer with snake search pattern capability.[3] Known to have been captured by China in 1978.[4]
  • Mod 4: Version for use as Mark 60 CAPTOR mine payload.[5][6]
  • Mod 5: 1979 upgrade kit for Mod 2, also known as NEARTIP (near-term improvement program). New passive/active sonar, liquid fuel and two speed engine for low speed search and high speed attack.[3]
    • Mod 5A: Cheaper NEARTIP upgrade kit for Mod 1 and Mod 2 with improved shallow-water performance. 1980s.[3]
    • Mod 5A(S): Variant of 5A that allows use in water as shallow as 40 m.[3]
    • Mod 5A(SW): Latest variant from 1996 Service Life Extension Program.[3] Boasts improved counter-countermeasure performance, enhanced target acquisition, provides a bottom-avoidance preset, and improved maintainability and reliability.[7]
  • Mod 6: Version for Mark 60 CAPTOR, with some NEARTIP components.[5]
  • Mod 7: Cancelled. Not funded by Congress.[8]

For most variants there is also an inert REXTORP (recoverable exercise torpedo) version.

Specifications

Mark 46, Mod 5
  • Primary Function: Air and ship-launched lightweight torpedo[9]
  • Contractor: Alliant Techsystems
  • Power Plant: Two-speed, reciprocating external combustion; Mono-propellant (Otto fuel II)
  • Length: Script error: No such module "convert". tube launch configuration (from ship),[10] Script error: No such module "convert". with ASROC rocket booster[9]
  • Weight: Script error: No such module "convert".[9] (warshot configuration)
  • Diameter: Script error: No such module "convert".[10]
  • Range: Script error: No such module "convert".[9]
  • Depth: > Script error: No such module "convert".
  • Speed: > Script error: No such module "convert".[9]
  • Guidance System: Homing mode: Active or passive/active acoustic homing[10]
  • Launch/search mode: Snake or circle search
  • Warhead: Script error: No such module "convert".[9] of PBXN-103 high explosive (bulk charge)
  • Date Deployed: 1967 (Mod 0);[9] 1979 (Mod 5)

Yu-7 variant

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,[11] but it started to be replaced by the Yu-11 in 2012.[4]

Operators

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See also

References

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  1. ↑ Script error: No such module "citation/CS1".
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  3. ↑ a b c d e f Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1". ADA081111.pdf
  7. ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c d e f g Thomas, Vincent C. The Almanac of Seapower 1987 Navy League of the United States (1987) Template:ISBN pp.190-191
  10. ↑ a b c Polmar, Norman "The Ships and Aircraft of the U.S. Fleet: Torpedoes" United States Naval Institute Proceedings November 1978 p.160
  11. ↑ (Chinese language) Template:Webarchive
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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External links

Template:Mark-series torpedoes

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