RUR-5 ASROC

"ASROC" redirects to this page. For the vertical-launch variant, see RUM-139 VL-ASROC.
RUR-5 ASROC

ASROC Launcher on board USS Columbus (1962)
Type Standoff anti-submarine ballistic missile[1]
Place of origin United States
Service history
In service 1961[2]
Used by United States Navy and others
Production history
Designer Naval Ordnance Test Station Pasadena[1]
Honeywell
Manufacturer Honeywell[2]
Unit cost Approximately $350,000 (not including warhead)
Specifications
Weight 1,073 pounds (487 kg)[2]
Length 14.75 ft (4.50 m)[2]
Diameter 16.6 inches (420 mm)
Warhead Mark 46 torpedo, 96.8 pounds (43.9 kg)[2] of PBXN-103 high explosive; 10kt W44 Nuclear Warhead (Retired)
Detonation
mechanism
 Payload Specific
Engine Solid propellant rocket motor[2]
Wingspan 26 7⁄8 inches (680 mm)
Operational
range
 12 mi (19 km)[2]
Speed Subsonic
Launch
platform
 Surface ships[1]
The destroyer USS Agerholm fires an ASROC with a nuclear depth bomb in the "Swordfish" test in 1962
ASROC 'Matchbox' reload doors are visible in this photograph of the Japanese Asagiri-class destroyer. Asagiri, formerly DD 151, renumbered TV 3516 after reclassification as a training vessel, seen here on 28 July 2008 departing from Portsmouth Naval Base, UK.
ASROC launch from USS Joseph Strauss, in 1978.

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.[3]

History

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:[4] 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.[5][6]

Description

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".[3]

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[7] 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 charge

The W44 nuclear depth charge entered service in 1961,[8] 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.[3]

Specific installations

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.[9]

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.

Movie appearance

In the movie The Bedford Incident (1965) an ASROC is inadvertently launched against a Soviet submarine.

Operators

Map with former RUR-5 operators in red

Former operators

 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 Navy
 United States Navy

See also

References

  1. 1 2 3 Jolie, E.W. (15 September 1978). "A Brief History of US Navy Torpedo Development: ASROC Missile". Retrieved 21 June 2013.
  2. 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
  3. 1 2 3 Friedman, Norman (May 1997). The Naval Institute Guide to World Naval Weapons Systems, 1997-1998. Annapolis, Maryland USA: United States Naval Institute Press. p. 668. ISBN 1-55750-268-4.
  4. ↑ "Navy Homing Torpedoes Fights Subs." Popular Mechanics, April 1958, p. 108.
  5. ↑ Bill Gunston Rocket & Missiles, Salamander Books Ltd 1979, ISSB 0-517-26870-1
  6. ↑ Norman Friedman U.S. Destroyers Naval Institute Press (April 1982), ISBN 08702-1733X, p. 280
  7. ↑ "Asroc" in The New Encyclopædia Britannica. Chicago: Encyclopædia Britannica Inc., 15th edn., 1992, Vol. 1, p. 639.
  8. ↑ Polmar, Norman (1983). "Tactical Nuclear Weapons". Proceedings (United States Naval Institute) 109 (7): 125.
  9. ↑ US Destroyers - Norman Friedman

External links

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