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Mark 46 torpedo
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Mark 46 torpedo : ウィキペディア英語版
Mark 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 the year 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
* Primary Function: Air and ship-launched lightweight torpedo〔Thomas, Vincent C. ''The Almanac of Seapower 1987'' Navy League of the United States (1987) ISBN 0-9610724-8-2 pp.190-191〕
* Contractor: Alliant Techsystems
* Power Plant: Two-speed, reciprocating external combustion; Mono-propellant (Otto fuel II)
* Length: 8 ft 6 in (2.59 m) tube launch configuration (from ship),〔Polmar, Norman "The Ships and Aircraft of the U.S. Fleet: Torpedoes" ''United States Naval Institute Proceedings'' November 1978 p.160〕 14 ft 9 in (4.5 m) with ASROC rocket booster〔
* Weight: 508 lb (231 kg)〔 (warshot configuration)
* Diameter: 12.75 in (324 mm)〔
* Range: 12,000 yd (11 km)〔
* Depth: > 1,200 ft (365 m)
* Speed: > 40 knots (46 mph, 74 km/h)〔
* Guidance System: Homing mode: Active or passive/active acoustic homing
* Launch/search mode: Snake or circle search
* Warhead: 96.8 lb (44 kg)〔 of PBXN-103 high explosive (bulk charge)
* Date Deployed: 1967 (Mod 0);〔 1979 (Mod 5)

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