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The RUR-5 ASROC (for "Anti-Submarine ROCket") is an all-weather, all sea-conditions anti-submarine missile system. Developed by the United States Navy in the 1950s, it was deployed in the 1960s, updated in the 1990s, and eventually installed on over 200 USN surface ships, specifically cruisers, destroyers, and frigates. The ASROC has been deployed on scores of warships of many other navies, including Canada, Germany, Italy, Japan, the Republic of China, Greece, Pakistan and others.
ASROC Launcher on board USS Columbus (1962)
|Type||Standoff anti-submarine ballistic missile|
|Place of origin||United States|
|Used by||United States Navy and others|
|Designer||Naval Ordnance Test Station Pasadena|
|Unit cost||Approximately $350,000 (not including warhead)|
|Mass||1,073 pounds (487 kg)|
|Length||14.75 ft (4.50 m)|
|Diameter||16.6 inches (420 mm)|
|Warhead||Mark 46 torpedo, 96.8 pounds (43.9 kg) of PBXN-103 high explosive; 10kt W44 Nuclear Warhead (Retired)|
|Engine||Solid propellant rocket motor|
|Wingspan||26 7⁄8 inches (680 mm)|
|12 mi (19 km)|
ASROC started development as the Rocket Assisted Torpedo (RAT) program by the Naval Ordnance Test Station at China Lake in the early 1950s to develop a surface warship ASW weapon counter to the new post-World War II submarines which ran quieter, at much higher speed and could attack from much longer range with high speed homing torpedoes. In addition, the goal was to take advantage of modern sonars with a much larger detection range. An extended range torpedo delivered by parachute from the air would allow warships the stand-off capability to attack hostile submarines with very little advance notice to the hostile submarine. The RAT program came in three phases: RAT-A, RAT-B and RAT-C. RAT-A (and its follow-on, RAT-B) were efforts to develop a compact and economical stand-off ASW for smaller warships, but were found to be either unreliable or had too short a range. RAT-C was a program to develop a stand-off ASW weapon that used a nuclear depth charge. This would require a range of at least 8,000 yards to escape potential damage from the underwater blast. Unlike the original RAT program rockets, the RAT-C was considerably larger to accomplish the extended range needed and was to be fitted to larger warships. With the failure of both the RAT-A and RAT-B programs, RAT-C was redesigned from a stand-off nuclear ASW weapon to one that could use not only a nuclear depth charge but also a homing ASW torpedo. To obtain the accuracy needed, the RAT-C rocket launcher had to be redesigned with larger side fins. This program finally combined reliability and accuracy, along with the necessary stand-off range. However, before RAT-C reached initial operational status in 1960 aboard the large US Navy destroyer leader USS Norfolk, its name was changed to the present ASROC. ASROC was first deployed in 1961 and eventually made the vast majority of USN surface combatants nuclear-capable.
The first ASROC system using the MK-112 "Matchbox" launcher was developed in the 1950s and installed in the 1960s. This system was phased out in the 1990s and replaced with the RUM-139 Vertical Launch ASROC, or "VLA".
After a surface ship, patrol plane or anti-submarine helicopter detects an enemy submarine by using sonar or other sensors, it could relay the sub's position to an ASROC-equipped ship for attack. The attacking ship would then fire an ASROC missile carrying an acoustic homing torpedo or a W44 Nuclear Depth Bomb onto an unguided ballistic trajectory toward the target. At a pre-determined point on the missile's trajectory, the payload separates from the missile and deploys a parachute to permit splashdown and water entry at a low speed and with minimum detectable noise. Water entry activates the torpedo, which is guided by its own sonar system, and homes in on the target using either active sonar or passive sonar.
W44 nuclear depth chargeEdit
The W44 nuclear depth charge entered service in 1961, but was never used beyond one or two tests before the Limited Nuclear Test Ban Treaty banning underwater nuclear tests went into effect. A total of 575 weapons were produced. The W44 weighed 170 pounds (77 kg) with a diameter of 13.75 inches (34.9 cm) and length of 25.3 inches (64 cm). Following payload separation, the unguided W44 sank quickly to a predetermined depth where the 10-kiloton warhead detonated. The nuclear-armed ASROC was never used in combat. W44-armed ASROC missiles were retired by 1989, when all types of nuclear depth bombs were removed from deployment.
One of the first ASROC installations was on USS Norfolk (DL-1) in 1960. The first large group of ships to receive ASROC were 78 Gearing-class destroyers, modified under the Fleet Rehabilitation and Modernization Mark I program (FRAM I) in the early 1960s. A Mark 112 8-tube ASROC launcher was added along with other major modifications. ASROC reloads were stowed alongside the helicopter hangar and handled by a small crane.
The 31 U.S. Navy Spruance-class destroyers were all built with the Mark 16 Mod 7 ASROC Launching Group and MK 4 ASROC Weapons Handling System (AWHS) reload system. These had one standard Mark 112 octuple ASROC launcher, located immediately above a reload system holding an additional 16 assembled rounds (two complete reloads of eight missiles apiece). Thus, each Spruance-class destroyer originally carried a maximum total of 24 ASROC.
Most other US Navy and allied navy destroyers, destroyer escorts, frigates, and several different classes of cruisers only carried the one ASROC "matchbox" MK 112 launcher with eight ASROC missiles (although later in service, some of those missiles could be replaced by the Harpoon anti-ship missile). The "matchbox" Mk 112 launchers were capable of carrying a mixture of the two types. Reloads were carried in many classes, either on first level of the superstructure immediately abaft the launcher, or in a separate deckhouse just forward or abaft the Mk 112.
The MK 16 Launching Group also had configurations that supported RGM-84 Harpoon (onboard Knox-class destroyer escorts (frigates)) or a variation of the Tartar missile in limited distribution.
Ships with the Mk 26 GMLS, and late marks of the Mk 10 GMLS aboard the Belknap-class cruisers, could accommodate ASROC in these power-loaded launchers (the Mk 13 GMLS was not able to fire the weapon, as the launcher rail was too short).
Most Spruance-class destroyers were later modified to include the Mk 41 VLS, these launchers are capable of carrying a mixture of the RUM-139 VL-ASROC, the Tomahawk TLAM, and other missiles. All of the Spruance destroyers carried two separate quad Harpoon launchers. Other US ships with the Mk 41 can also accommodate VL-ASROC.
- Brazilian Navy
- Royal Canadian Navy
- - only on Restigouche-class destroyers (after IRE/DELEX modification.)
- German Navy
- - only on Lütjens-class destroyers
- Hellenic Navy
- Marina Militare
- - only on Vittorio Veneto using a Mk 10 GMLS launcher (depot for 40 missiles, between RIM-2 Terrier / RIM-67A SM-1ER and ASROC)
- Japan Maritime Self-Defense Force
- Mexican Navy
- Republic of Korea Navy
- Pakistan Navy
- Spanish Navy
- Republic of China Navy
- Royal Thai Navy
- Turkish Naval Forces
- United States Navy and United States Coast Guard
- - same configurations as US Navy were also deployed on some United States Coast Guard 378' High Endurance Hamilton Class Cutters during the 1970's and early 1980's.
- Jolie, E.W. (15 September 1978). "A Brief History of US Navy Torpedo Development: ASROC Missile". Retrieved 21 June 2013.
- Thomas, Vincent C. The Almanac of Seapower 1987 Navy League of the United States (1987) ISBN 0-9610724-8-2 pp.190-191
- "Navy Homing Torpedoes Fights Subs." Popular Mechanics, April 1958, p. 108.
- Bill Gunston Rocket & Missiles, Salamander Books Ltd 1979, ISSB 0-517-26870-1
- Friedman, Norman (2004). US Destroyers: An Illustrated Design History (Revised Edition). Annapolis: Naval Institute Press. pp. 280–287. ISBN 1-55750-442-3.
- "Asroc" in The New Encyclopædia Britannica. Chicago: Encyclopædia Britannica Inc., 15th edn., 1992, Vol. 1, p. 639.
- Polmar, Norman (1983). "Tactical Nuclear Weapons". Proceedings. United States Naval Institute. 109 (7): 125.
- Special Feature – FRAM at NavSource.org
- Friedman 2004, p. 482