CBU-100 Cluster Bomb

CBU-100 Cluster Bomb
A CBU-99, foreground, along with an AGM-12B and an AGM-12C. The CBU-99 and CBU-100 are nearly identical.

The CBU-100 Cluster Bomb (also called the Mk-20 Rockeye II) is an American cluster bomb which is employed primarily in an anti-tank mode. It weighs 490 pounds and carries 247 Mk 118 Mod 1 bomblets.

The anti-tank cluster bomb is an air-launched, conventional free-fall weapon. The Mk 20, CBU-99, and CBU-100 are used against armored vehicles.



When the Mk 20 bomb cluster is released from the aircraft, the arming wires (primary and/or optional arming) are pulled sufficiently to arm the Mk 339 fuse (and recently the FMU-140 fuse) and release the fins. The positive armed fin release arming wire frees the fin release band, and the movable fins snap open by spring-force. Functioning of the fuse initiates the linear shaped-charges in the dispenser that cut the dispenser case in half and disperse the bombs/bomblets. When the Mk 339 Mod 1 primary fuse arming wire is pulled, the fuse will function 1.2 seconds after the arming wire has been extracted. If the pilot selects the option time (4.0 seconds), both the primary and option arming wires must be pulled. If the pilot selects the option time and the primary arming wire is not pulled, the fuse will be a dud.


The CBUs are delivered to the fleet as completely assembled all-up-rounds (AURs). Fuzes, suspension lugs, arming wires, wire extractors, and all other necessary components are installed.The information on configuration, functional description, and shipping and storage containers of the Mk 7 bomb dispenser and its associated components can be found in NAVAIR 11-5A-3, also information on decanning, preparation for use, and recanning procedures are found in NAVAIR 11-140-9. MK 20 MODS/CBU-99/CBU-100, BOMB CLUSTER CONFIGURATIONS The configurations of the Mk 20 Mods/ CBU-99/CBU-100 are listed in the table below. Mk 7 and Mods Bomb Dispenser The cargo section of the Mk 7 bomb dispenser is the main structure of the weapon and contains the bombs/bomblets. A nose fairing is attached to the forward end of the cargo section for aerodynamics and fuze installation. It has an observation window for viewing the safe/arm indicator on the installed fuze. The dispenser has two linear-shaped charges secured longitudinally inside the walls. When initiated, these shaped charges cut the dispenser in half, from front to rear, and the bombs/bomblets spread in free-fall trajectories.

A Rockeye immediately after opening, showing the 247 bomblets.

To stabilize the weapon after release from the aircraft, a tail cone assembly is attached to the aft end of the cargo section. The tail cone assembly houses four, spring-actuated folding fins. The fins are spring-loaded to the open position and secured in the closed position during ground handling by a fin release-band assembly. The fin release band is secured in the closed position by a safety cotter pin and by the fin release wire. A yellow band around the forward end of the cargo section indicates the explosive content of the weapon. The Mk 7 Mods 3, 4, and 6 bomb dispensers have the Mk 339 Mod 1 fuze, which provides the pilot with in-flight selection of the fuze function time. The Mk 7 Mod 4 bomb dispenser differs from the Mk 7 Mod 3 by modifying the dispenser and giving interface capabilities with a wider range of military aircraft. The Mk 7Mod 6 bomb dispenser is the same as the Mk 7 Mod 3 except that the outside of the Mod 6 cargo section is coated with a thermal protective coating and has an additional yellow band around the forward end of the cargo section. The addition of the thermal coating increases the overall weight of the Mod 6 to 505 pounds

Each bomblet weighs 1.32 pounds (600 g) and has a 0.4-pound (180 g) shaped-charge warhead of high explosives, which produces up to 250,000 psi (1.7 GPa) at the point of impact, allowing penetration of approximately 7.5 inches (190 mm) of armor. Rockeye is most efficiently used against area targets requiring penetration to kill. Fielded in 1968, the Rockeye dispenser is also used in the Gator air-delivered mine system. During Desert Storm US Marines used the weapon extensively, dropping 15,828 of the 27,987 total Rockeyes against armor, artillery, and personnel targets. The remainder were dropped by Air Force (5,346) and Navy (6,813) aircraft.[1]

According to a test report conducted by the United States Navy's Weapon System Explosives Safety Review Board (WSESRB) established in the wake of the tragic 1967 USS Forrestal fire, the cooking off time for a Rockeye CBU is approximately 1 minute 13 seconds.


  1. ^ "Military-Systems-Munitions-Mk.20" globalsecurity.org

External links

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Cluster munition — SD2 Butterfly Bomb circa 1940. Wings rotate as bomb falls, unscrewing the arming spindle connected to the fuze A cluster munition is a form of air dropped or ground launched explosive weapon that releases or ejects smaller sub munitions. Commonly …   Wikipedia

  • CBU-87 Combined Effects Munition — The CBU 87 Combined Effects Munition is a cluster bomb used by the United States Air Force. CBU stands for Cluster Bomb Unit.It was developed by Aerojet General/Honeywell. In 1986, the bomb was introduced to replace the earlier cluster bombs used …   Wikipedia

  • CBU-97 Sensor Fuzed Weapon — Developed and produced by Textron Defense Systems, the CBU 97 Sensor Fuzed Weapon is a United States Air Force 1,000 pound class (450 kg) non guided (freefall) cluster bomb, hence the name CBU (Cluster Bomb Unit).OverviewThe CBU 97 consists of an …   Wikipedia

  • CBU-72 — The CBU 72 was a 550 pound American fuel air cluster bomb used by the United States Military until 1996. It was very effective against armored vehicles, aircraft parked in the open, bunkers, and minefields.DesignThe CBU 72 consisted of three fuel …   Wikipedia

  • Dumb-Bomb — Freifallbombe Eine Freifallbombe, auch ungelenkte Bombe oder dumme Bombe (englisch dumb bomb, gravity bomb), ist eine Bombe, die ohne jegliches Lenksystem einfach auf ihr Ziel fällt. Der Begriff dumme Bombe kam erst auf, als ca. 1970 die so… …   Deutsch Wikipedia

  • Weapons of the 2003 invasion and occupation of Iraq — This article covers the weapons used in the 2003 invasion and subsequent occupation of Iraq. On April 9, 2003, Baghdad was formally secured. As the summer of 2003 gave way to autumn, the pattern of anti occupation attacks shifted to include… …   Wikipedia

  • List of bombs in the Vietnam War — The American air campaign during the Vietnam War was one of the largest in military history. The US contribution to this air war was the largest, Chief of Staff of the United States Air Force Curtis LeMay, stated that we re going to bomb them… …   Wikipedia

  • JF-17 Thunder — infobox Aircraft name = JF 17 Thunder FC 1 Fierce Dragon type = Multirole fighter manufacturer = Chengdu Aircraft Industry Corporation Pakistan Aeronautical Complex caption = JF 17 in the testing phase 2006 designer = first flight = 25 August… …   Wikipedia

  • Lockheed Martin F-35 Lightning II — F 35 Lightning II Un F 35 Lightning II, nombrado AA 1, aterrizando en la Base Aérea Edwards el 23 de octubre de 2008. Tipo Caza polivalente furtivo …   Wikipedia Español

  • B-1 Lancer — Infobox Aircraft name = B 1 Lancer type = Strategic bomber national origin = United States manufacturer = North American Rockwell Rockwell International Boeing caption = A B 1B Lancer in flight. designer = first flight = 23 December 1974… …   Wikipedia