The CBU-87 Combined Effects Munition (CEM) is a cluster bomb used by the United States Air Force, developed by Aerojet General/Honeywell and introduced in 1986 to replace the earlier cluster bombs used in the Vietnam War. CBU stands for Cluster Bomb Unit. When the CBU-87 is used in conjunction with the Wind Corrected Munitions Dispenser guidance tail kit, it becomes much more accurate, and is designated CBU-103. [1]
The basic CBU-87 is designed to be dropped from an aircraft at any altitude and any air speed. It is a free-falling bomb and relies on the aircraft to aim it before it drops; once dropped it needs no further instruction, as opposed to guided munitions or smart bombs. The bomb can be dropped by a variety of modern-day aircraft. It is 7 feet 7 inches (2.31 meters) long, has a diameter of 16 inches (41 centimeters), and weighs roughly 951 pounds (431 kg). The price is US$14,000 per bomb.[ citation needed ]
Each CBU-87 consists of an SUU-65B canister, a fuze with 12 time delay options and 202 submunitions (or bomblets) designated BLU-97/B Combined Effects Bomb. Each bomblet is a yellow cylinder with a length of 20 centimeters and a diameter of 6 centimeters. The BLU-97/B bomblets are designed to be used against armor, people and soft skinned targets and consist of a shaped charge, a scored steel fragmentation case and a zirconium ring for incendiary effects. The CBU-87 can also be equipped with an optional FZU-39/B proximity sensor with 10 altitude selections.
When dropped from an aircraft, the bomb starts spinning. There are 6 speeds that can adjust the bomb's rate of spin. After it drops to a certain altitude, the canister breaks open and the submunitions are released. Each bomblet has a ring of tabs at the tail end; these orient the bomblet and deploy an inflatable decelerator to decrease the falling speed of the bomblet. When the submunitions hit the ground, they will cover a large area and the CBU-87 can be adjusted so it can cover a smaller or wider area. Depending on the rate of spin and the altitude at which the canister opens, it can cover an area between 20×20 meters (low release altitude and a slow rate of spin) to 120×240 meters (high release altitude and a high rate of spin).
Manufacturers and the Department of Defense have claimed that each bomb's failure rate is about 5%. [2] This equates to about 10 bomblets not exploding on impact of the 202 bomblets dropped. Landmine Action claimed the failure rate of the BLU-97/Bs used in the Kosovo campaign was higher, between 7 and 8 percent. [3]
During Operation Desert Storm, the US Air Force dropped 10,035 CBU-87s. During Operation Allied Force, the US dropped about 1,100 cluster bombs, mostly CBU-87s.
On 7 May 1999, a CBU-87 was used in one of the most serious incidents involving civilian deaths and cluster bombs, the Niš cluster bombing.
- CBU-97 Sensor Fuzed Weapon, a cluster bomb with smart submunitions.
A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill personnel and destroy vehicles. Other cluster munitions are designed to destroy runways or electric power transmission lines.
The GATOR mine system is a United States military system of air-dropped anti-tank and anti-personnel mines developed in the 1980s to be compatible with existing cluster dispensers. It is used with two dispenser systems—the Navy 230 kg (500 lb) CBU-78/B and the Air Force 450 kg (1,000 lb) CBU-89/B. Additionally the mines are used with the land- and helicopter-based Volcano mine system.
The Mark 82 is a 500-pound (230 kg) unguided, low-drag general-purpose bomb, part of the United States Mark 80 series. The explosive filling is usually tritonal, though other compositions have sometimes been used.
The AGM-154 Joint Standoff Weapon (JSOW) is a glide bomb that resulted from a joint venture between the United States Navy and Air Force to deploy a standardized medium-range precision-guided weapon, especially for engagement of defended targets from outside the range of standard anti-aircraft defenses, thereby increasing aircraft survivability and minimizing friendly losses. It is intended to be used against soft targets such as parked aircraft, trucks, armored personnel carriers (APCs), and surface-to-air missile sites (SAMs). Prior to launch, it is given a destination through either a predesignated waypoint or a point marked through a targeting pod. It glides, using two wings that pop out for added lift, to the marked destination and dispenses submunitions in a short, roughly linear pattern. The designation of the Joint Standoff Weapon as an "air-to-ground missile" is a misnomer, as it is an unpowered bomb with guidance avionics, similar to the older GBU-15.
The Butterfly Bomb was a German 2-kilogram (4.4 lb) anti-personnel submunition used by the Luftwaffe during the Second World War. It was so named because the thin cylindrical metal outer shell which hinged open when the bomblet deployed gave it the superficial appearance of a large butterfly. The design was very distinctive and easy to recognise. SD 2 bomblets were not dropped individually, but were packed into containers holding between 6 and 108 submunitions e.g. the AB 23 SD 2 and AB 250-3 submunition dispensers. The SD 2 submunitions were released after the container was released from the aircraft and had burst open. Because SD 2s were always dropped in groups the discovery of one unexploded SD 2 was a reliable indication that others had been dropped nearby. This bomb type was one of the first cluster bombs ever used in combat and it proved to be a highly effective weapon. The bomb containers that carried the SD 2 bomblets and released them in the air were nicknamed the "Devil's Eggs" by Luftwaffe air and ground crew.
Anti-runway penetration bombs are explosive weapons involving bombs or bomblets designed to damage or destroy runways, or otherwise render them unusable for aircraft.
The CBU-97 Sensor Fuzed Weapon is a United States Air Force 1,000-pound (450 kg)-class freefall Cluster Bomb Unit. It was developed and produced by Textron Defense Systems. A CBU-97 used in conjunction with the Wind Corrected Munitions Dispenser guidance tail kit is converted to a precision-guided weapon, and the combination is designated CBU-105.
The Mk 20 Rockeye II, CBU-99 Rockeye II, and CBU-100 Rockeye II comprise an American cluster bomb family which are employed primarily in an anti-tank mode against armored vehicles.
BL755 is a cluster bomb developed by Hunting Aircraft that contains 147 parachute-retarded high explosive anti-tank (HEAT) submunitions. Its primary targets are armoured vehicles and tanks with secondary soft target capabilities. It entered service with the Royal Air Force (RAF) in 1973.
The CBU-24 is an unguided, aircraft delivered anti-personnel and anti-materiel weapon developed by the United States. Because it is an unguided weapon, the CBU-24 can be carried and dropped by any aircraft capable of carrying standard "dumb" or "iron" bombs.
BLU-43/B and BLU-44/B "Dragontooth" were air-dropped cluster-type land mines used by the United States during the Vietnam War. It is chemically activated and has a relatively low explosive content, typically maiming rather than killing.
The CBU-75Sadeye was a United States cluster bomb used during the Vietnam War. It could hold 1,800 one pound (450 g) BLU-26 anti-personnel bomblets, each containing 0.7 pounds (320 g) of explosives with impact or time delay fuzes that would produce around 600 fragments.
The BLU-108 is an air-delivered submunition, containing four further smart "Skeet" warheads. The system is manufactured by Textron Systems Weapon & Sensor Systems since 1992. The BLU-108 is released from a munitions dispenser, with a parachute being used to slow its descent. It then fires the four rapidly rotating skeets, which use multi-mode optical sensors to identify a variety of targets ranging from tanks and missile launchers to railway locomotives and stationary aircraft. When the skeet passes over what it considers a high priority target, it fires a 0.9 kg explosively formed penetrator providing armor-piercing and incendiary effects, as well as a fragmentation ring meant to damage any soft targets, primarily enemy personnel, in the immediate vicinity of the target.
The Wind Corrected Munitions Dispenser or WCMD system is a US tail kit produced by Lockheed Martin for use with the Tactical Munitions Dispenser family of cluster bombs to convert them to precision-guided munitions. In 1997 the United States Air Force issued contracts to complete development and begin production of the WCMD, planning to modify 40,000 tactical munitions dispensers - 30,000 for CEM and 5,000 each for Gator and SFW - at a cost of US$8,937 per unit.
The BLU-97/B Combined Effects Bomb is the submunition used in several cluster bomb type weapon systems, mainly the CBU-87 and its precision-guided version CBU-103. When the bomblets fall, they separate from the main bomb and independently free fall to the ground. They contain an inflatable bag (ballute) on the top of them, which slows them down and spreads them out. Once the bomblets reach a force of 6 Gs they arm themselves. As the bomblets fall, they are also spinning. Arming takes about 2.6 seconds. They have a combined shaped charge, fragmentation and incendiary effect on the target. It is very effective against and mainly used for anti-personnel, anti-materiel, and anti-armor.
The CBU-55 was a cluster bomb fuel–air explosive that was developed during the Vietnam War by the United States Air Force, and was used only infrequently in that conflict. Unlike most incendiaries, which contained napalm or phosphorus, the 750-pound (340 kg) CBU-55 was fueled primarily by propane. Described as "the most powerful non-nuclear weapon in the U.S. arsenal," the device was one of the more powerful conventional weapons designed for warfare.
The CBU-107 Passive Attack Weapon (PAW) is an air-dropped guided bomb containing metal penetrator rods of various sizes. It was designed to attack targets where an explosive effect may be undesirable, such as fuel storage tanks or chemical weapon stockpiles in civilian areas.
The CBU-72 was a 550-pound (250 kg) 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.
The Convention on Cluster Munitions (CCM) is an international treaty that prohibits all use, transfer, production, and stockpiling of cluster munitions, a type of explosive weapon which scatters submunitions ("bomblets") over an area. Additionally, the convention establishes a framework to support victim assistance, clearance of contaminated sites, risk reduction education, and stockpile destruction. The convention was adopted on 30 May 2008 in Dublin, and was opened for signature on 3 December 2008 in Oslo. It entered into force on 1 August 2010, six months after it was ratified by 30 states. As of December 2023, a total of 124 states are committed to the goal of the convention, with 112 states that have ratified it, and 12 states that have signed the convention but not yet ratified it.a
The M138 bomblet was a sub-munition of the U.S. chemical weapon, the M43 BZ cluster bomb. The bomblet contained BZ, an incapacitating agent and was developed with the M43 in 1962. The M138s, along with all other U.S. BZ weapons were destroyed during the 1980s.