BL755

Last updated

BL755
BL 755 cluster bomb.JPG
TypeAnti-armour cluster bomb
Place of originUnited Kingdom
Service history
Used by Royal Air Force, Royal Navy
Wars Falklands War, 1991 Gulf War, Croatian War of Independence, Bosnian War, Yemeni civil war
Production history
Designer Hunting Engineering, Ltd.
ManufacturerHunting Engineering, Ltd.
Producedsince 1972
No. builtAs of 1 January 1996, 60,598 bombs and 8,925,906 submunitions [1]
VariantsBL755, IBL755, RBL755
Specifications
Mass264 kg (582 lb)
Length2,451 mm (8 ft 0.5 in)
Diameter419 mm (16.5 in)

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 (anti personnel) capabilities. It entered service with the Royal Air Force (RAF) in 1973.

Contents

BL755 was developed as a new-generation anti-tank weapon that would allow extremely low-level attacks against Soviet armoured formations. The introduction of the ZSU-23-4 Shilka self-propelled anti-aircraft gun rendered the pop-up attack profile demanded by iron bombs and air-to-ground rockets almost suicidal. The cluster munition would be dropped in pairs while the aircraft overflew the formation at 450 knots (830 km/h; 520 mph) and 300 feet altitude, covering an area of 1,000 by 500 feet (300 m × 150 m).

The weapon's first use in combat was during the Falklands War where it was used in the anti-infantry role. When dropped from ultra-low altitudes, the bomblets proved to have a very high failure rate because the parachutes often did not deploy in time. A new version was ordered for the Gulf War that added a radar altimeter allowing release from medium altitudes and then opening at the proper altitude.

As part of the 2007 Convention on Cluster Munitions negotiations, the RAF agreed to remove the BL755 from its inventory by 2008. Its role has been replaced by the CRV7, an air-to-ground rocket with such improved performance that it is effective even in the face of the ZSU.

History

Previous systems

For many years the standard RAF anti-armour weapon was the "60lb" RP-3, the Second World War-era air-to-ground rocket used by British aircraft such as the Hawker Typhoons of the Second Tactical Air Force. These were still being widely used in the 1960s, especially during the Aden Emergency in battles between Yemen and Radforce in what was then the Aden Protectorate where Hawker Hunters fired a total of 2,508 RP-3 over 642 sorties. With the British withdrawal in November 1967, the Hunters moved to Bahrain and the RP-3 was retired after decades of service. [2]

The RP-3 was replaced by the 68mm (2.7 inch) SNEB, a version of the seminal post-war rocket design, the US Folding-Fin Aerial Rocket (FFAR). These rockets were fired from a streamlined pod made by Matra (giving it the alternative name) rather than individual rails, which greatly reduced drag and dramatically increased the number of rockets that could be carried. While a Hunter might carry eight RP-3s, it typically carried two M115 18-rocket pods for a total of 36 SNEBs. [2] The SNEB was also more accurate; the RP-3 had an average dispersion around 2.3 degrees, while the larger snap-out fins of the SNEB reduced this to just over 1 degree. However, the smaller rocket motor did result in slightly lower velocity and longer flight times, although the effective range was slightly longer. [3]

The SNEB appears to have been used in combat only once, when they were mounted on some British Army Aérospatiale Gazelle helicopters during the Falklands War in 1982. Records suggest none were actually fired. The SNEB was also cleared for carriage by many other aircraft used in the conflict, but due to the possibility that shipboard radars might fire the electrical ignitors while in the magazines, most used an older Royal Navy 2-inch (51 mm) rocket design instead. [4]

SR(A)1197

In the early 1970s the Ministry of Defence was startled by reports of the effectiveness of the ZSU-23-4 Shilka which first entered service in 1965 and had replaced all earlier systems in Soviet use by the early 1970s. Using older weapons like the 1000 lb GP bomb [lower-alpha 1] or the SNEB against tanks required the aircraft to fly low and then "pop up" during the final approach to about 700 feet (210 m) altitude and then fly directly at the target. In the case of the SNEB this required a dive at around 10 degrees and firing at a range of about 1,500 yards (1,400 m). This was right within the engagement envelope of the Shilka. Furthermore, a total of 20 aircraft would be needed to guarantee the armour formation would be broken up, meaning the Shilka would have many chances to attack. This led to serious concerns about the survivability of the RAF in the anti-armour role. [4] As it was later stated:

The effectiveness of modern air defence systems in the field is such that the use of dive bombing or rocket attacks is likely to involve an unacceptable casualty rate. [4]

This led to the issuing of Staff Requirement SR(A)1197 for a new weapon capable of being delivered from very low altitudes, about 300 feet (91 m), while overflying the target area without the need to pop up. [5]

BL755

Hunting Aircraft won the contract with what became BL755. [4] The 600 lb (270 kg) weapon looked like a conventional bomb, but contained 147 sub-munitions arranged in seven rows of 21 each behind frangible covers. After release from the aircraft, the "bomb" was popped open using an inflatable bag that drove the munitions outward, breaking the covers and scattering the bombs. The sub-munitions consisted of a small high explosive anti-tank warhead with a stabilizing "coronet" that flipped out on ejection to ensure they were facing forward when they impacted. The trigger was mounted on a spring that extended after launch to ensure the bomb fired at the right range from the armour. [5]

The weapon reached its initial in-service version with the No. 1 Mk. 4 design of 1973, [5] with carriage on the Hawker Harrier GR.3, SEPECAT Jaguar GR.1, Blackburn Buccaneer S.2. [6] and F-4 Phantom. Some indication of its effectiveness compared to the SNEB is that calculations suggested nine aircraft each dropping two BL755s would have the same effect as 20 aircraft firing 36 SNEB each. [7]

IBL755

It was precisely at this time that the Soviets began introducing the T-72 tank into service, which had enough armour to defeat the BL755 if it hit the frontal arc of the tank. [5] In response, Hunting modified the design to replace the coronet with a small parachute contained in a basket at the back of the sub-munitions. This slowed the weapon so that it normally hit the tank from the top where it had no problems penetrating the armour. This No. 2 Mk. 1 version, also known as IBL755, [8] remained effective against Soviet armour for the rest of the BL755's history. [5]

RBL755

BL755 had its first major use during the Falklands War, where it was extensively used by the Hawker Siddeley Harrier aircraft. It was found that when the Safety, Arming and Functioning Unit (SAFU) was set to its lowest altitude setting, the parachutes did not have time to fully deploy and the bomblets often struck the ground at an angle that meant their trigger was not set off. [6]

When the RAF began preparing for the Gulf War in 1991, they decided that all weapons would be released from medium altitudes, which the BL755 was not really suited to given the SAFU was designed for a range of altitudes from low to ultra-low. This led to an Urgent Operational Requirement and the modification of those remaining BL755's with No. 1 Mk. 4 with the addition of a Motorola radar altimeter to produce the RBL755 – the R for 'radar'. The incorporation of the altimeter meant the weapon always released the sub-munitions at the right time to ensure they had the right trajectory to trigger, which also had the side-effect of eliminating any pre-setting on the part of the pilot. [5]

Replacement

As part of the international Convention on Cluster Munitions carried out in Oslo in 2007, the UK agreed to remove the BL755 from service. Its replacement was the CRV7, another rocket developed from the FFAR, but one with a new solid-propellant rocket of dramatically improved performance. Whereas the RP-3 and SNEB had an effective firing range on the order of 1,500 yards (1,400 m), the CRV7 is effective to about 20,000 feet (6,100 m) and flies at about three times the speed of these earlier weapons. This allows the launching aircraft to fire whilst still outside the range of weapons like the Shilka. [3]

Design

The BL755 looks like a standard 450-kilogram (1,000 lb) general-purpose bomb but with a hard "saddle" on the spine for ejector release and crutching pad loads and a distinctive large turbine-like air arming vane on the nose. The four rear fins are squared off in appearance, but on closer inspection can be seen to be hollow and telescopic. A central extruded aluminium skeleton is divided into seven bays, each containing 21 submunitions (147 total). The bays are covered by a frangible cover that the submunitions break during ejection. The submunitions are ejected by a central gas cartridge and individual inflatable bladders for each bay, operating in a similar manner to a car airbag. Ejection on the original BL755 bomb is triggered by the rotation of the arming vane, driven by the airflow.

Each submunition is contained within its own SAFU (safety and arming unit) and is telescoped shut. Upon release, the submunition is expanded by a spring. A focal distance standoff and detonating device deploys at the front and a fan of stabilizing fins at the rear. Each has a shaped charge HEAT warhead for armour penetration, the casing of which is constructed from wound tessellated square wire, which produces around 1,400 anti-personnel fragments. A single cluster bomb produces a total of more than two hundred thousand fragments.

Deployment

The bomb is cleared for use by the Panavia Tornado aircraft in the British Royal Air Force.

United Kingdom

The BL755 was used in combat by the Royal Navy and the RAF during the Falklands War and the RAF during the second Gulf War (Operation Telic) and Bosnian War. During the first Gulf War a small number were deployed by RAF Jaguars.[ citation needed ]

Yugoslavia

On the night of 27 October 1991, a Yugoslavian Soko J-22 Orao mistakenly dropped two BL755 Mk.3 bombs on the outskirts of Barcs, a small city in southernmost part of Hungary, causing extensive material damage, but no casualties. The incident led to an emergency upgrade of the Hungarian Air Force, which obtained 28 new MiG-29B fighter jets in exchange for a write-off of ex-Soviet state debt. The Hungarian government also invited NATO's Boeing E-3 Sentry AWACS planes to patrol over the Lake Balaton area, keeping a constant radar eye on the Balkan civil war theatre. [ citation needed ]

Zimbabwe

The Air Force of Zimbabwe's BAE Hawks were armed with BL755s, which were used against the Rwandan, Ugandan and Congolese rebel forces during the early stages of the Second Congo War, in support of Congolese leader Laurent Kabila.[ citation needed ]

Iran

The Islamic Republic of Iran Air Force heavily used BL755 cluster bombs on Iraqi troop and armour concentrations during the Iran-Iraq War. They were carried by the F-5E, F-5F, F-4D and F-4E Phantoms.[ citation needed ]

Saudi Arabia/UAE

Both Saudi Arabia and the United Arab Emirates have used the BL755 cluster bomb in the Saudi Arabian-led intervention in Yemen and ongoing Yemeni Civil War. [9] [10]

Operators

Former operators

Notes

  1. nominal weight – approx 450 kg

Related Research Articles

<span class="mw-page-title-main">Cluster munition</span> Explosive weapon with small 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.

<span class="mw-page-title-main">ALARM</span> British air-launched anti-radiation missile

ALARM is a British anti-radiation missile designed primarily to destroy enemy radars for the purpose of Suppression of Enemy Air Defenses (SEAD). It was used by the RAF and is still used by the Royal Saudi Air Force. The weapon was retired by the UK at the end of 2013.

<span class="mw-page-title-main">CRV7</span> Canadian 2.75-inch rocket

The CRV7, short for "Canadian Rocket Vehicle 7", is a 2.75-inch (70 mm) folding-fin ground attack rocket produced by Bristol Aerospace in Winnipeg, Manitoba. It was introduced in the early 1970s as an upgraded version of the standard U.S. 2.75-inch air-to-ground rockets. It was the most powerful weapon of its class, the first with enough energy to penetrate standard Warsaw Pact aircraft hangars. The CRV7 remains one of the most powerful air-to-ground attack rockets to this day, and has slowly become the de facto standard for Western-aligned forces outside the United States. Beginning in 2021, 83,303 stored Canadian CRV7s are slated for disposal having been removed from service from 2005 to 2007. In 2024 the Department of National Defence is considering donating the rockets to Ukraine as military aid to defend against the Russian invasion of Ukraine. An estimated 8,000 rockets have functioning warheads while the remainder could be used for parts or modification.

<span class="mw-page-title-main">Brimstone (missile)</span> British air-to-surface missile

Brimstone is a ground or air-launched ground attack missile developed by MBDA UK for the UK's Royal Air Force. It was originally intended for "fire-and-forget" use against mass formations of enemy armour, using a millimetre wave (mmW) active radar homing seeker to ensure accuracy even against moving targets. Experience in Afghanistan led to the addition of laser guidance in the dual-mode Brimstone missile, allowing a "spotter" to pick out specific and the highest priority targets, particularly useful to minimise collateral damage when friendly forces or civilians were in the area. The tandem shaped-charge warhead is much more effective against modern tanks than older similar weapons such as the AGM-65G Maverick missile. Three Brimstones are carried on a launcher that occupies a single weapon station, allowing a single aircraft to carry many missiles.

<span class="mw-page-title-main">Anti-runway penetration bomb</span> Explosive weapons designed to damage or destroy runways

Anti-runway penetration bombs are explosive weapons involving bombs or bomblets designed to damage or destroy runways, or otherwise render them unusable for aircraft.

<span class="mw-page-title-main">CBU-97 Sensor Fuzed Weapon</span> Anti-vehicle "smart" cluster bomb

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.

<span class="mw-page-title-main">CBU-100 Cluster Bomb</span> American cluster bomb

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.

<span class="mw-page-title-main">Vickers 40 mm Class S gun</span> 40 mm ground attack aircraft cannon

The Vickers 40 mm Class S gun, also known simply as the Vickers S or S gun, was a 40 mm (1.57 in) airborne autocannon designed by Vickers-Armstrongs for use as aircraft armament.

<span class="mw-page-title-main">JP233</span> British submunition delivery system

The JP233, originally known as the Low-Altitude Airfield Attack System(LAAAS), is a British submunition delivery system. It consists of large dispenser pods carrying several hundred submunitions designed to attack runways.

<span class="mw-page-title-main">RP-3</span> Unguided air-to-surface rocket

The RP-3 was a British air to ground rocket projectile introduced during the Second World War. The "3 inch" designation referred to the nominal diameter of the rocket motor tube. The use of a 60 lb (27 kg) warhead gave rise to the alternative name of the "60-pound rocket". Though an air-to-ground weapon, it saw limited use in other roles. They were generally used by British fighter-bomber aircraft against targets such as tanks, trains, motor transport and buildings, as well as by Coastal Command and Royal Navy aircraft against U-boats and ships.

<span class="mw-page-title-main">Dual-purpose improved conventional munition</span> Artillery warhead

A dual-purpose improved conventional munition (DPICM) is an artillery or surface-to-surface missile warhead designed to burst into submunitions at an optimum altitude and distance from the desired target for dense area coverage. The submunitions use both shaped charges for the anti-armor role, and fragmentation for the antipersonnel role, hence the nomenclature "dual-purpose". Some submunitions may be designed for delayed reaction or mobility denial (mines). The air-to-surface variety of this kind of munition is better known as a cluster bomb. They are banned by more than 100 countries under the Convention on Cluster Munitions.

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.

<span class="mw-page-title-main">SNEB</span> Air-to-ground military rocket system

The SNEB rocket is an unguided air-to-surface 68 mm (2.7 in) rocket projectile manufactured by the French company TDA Armements, designed for launch by attack aircraft and helicopters. It is also known as the SNEB rocket pod, and sometimes as the Matra rocket, due to it commonly being carried in pod-like launchers built by Matra.

<span class="mw-page-title-main">Precision-guided munition</span> "Smart bombs", used to strike targets precisely

A precision-guided munition is a guided munition intended to hit a specific target, to minimize collateral damage and increase lethality against intended targets. During the First Gulf War guided munitions accounted for only 9% of weapons fired, but accounted for 75% of all successful hits. Despite guided weapons generally being used on more difficult targets, they were still 35 times more likely to destroy their targets per weapon dropped.

The MAT-120 cargo bomb is a Spanish-produced cluster munition, fired from a 120mm calibre mortar produced by Instalaza SA. The main body of the round holds dual-purpose anti-tank/anti-personnel submunitions. The MAT-120 submunitions are unique in that to prevent the dangers of unexploded duds, there is a double redundant feature the manufacturer refers to as self-destruction and self-sterilization. This prevents unexploded MAT-120 submunitions from lying around becoming de facto landmines, dangerous to both combatants and non-combatants.

<span class="mw-page-title-main">British Aerospace Hawk 200</span> Type of aircraft

The British Aerospace Hawk 200 is a single-seat, single engine light multirole fighter designed for air defence, air denial, anti-shipping, interdiction, close air support, and ground attack.

<span class="mw-page-title-main">2-inch RP</span> 1950s rocket weapon developed by the UK Royal Navy

The 2-inch RP, short for Rocket Projectile, 2-inch, Number 1 Mark 1, was an unguided rocket weapon developed by the Royal Navy in the 1950s. It is generally similar to contemporary rockets like the SNEB and FFAR, although somewhat smaller. It is sometimes known as the RP-2 or RN, but most often referred to simply as the 2-inch.

References

Citations

  1. "BL755 Cluster Bomb and BL755 Submunition – Archived 12/97" . Forecast International: Intelligence Center.
  2. 1 2 Herriot 2009, p. 100.
  3. 1 2 Herriot 2009, p. 107.
  4. 1 2 3 4 Herriot 2009, p. 103.
  5. 1 2 3 4 5 6 Herriot 2009, p. 105.
  6. 1 2 Herriot 2009, p. 106.
  7. Herriot 2009, p. 104.
  8. 1 2 "Cluster Bombs". Archived from the original on 21 June 2007. Retrieved 26 July 2007.
  9. 1 2 Tom Peck (23 May 2016). "British-made cluster bomb found in Yemeni village targeted by Saudi-led coalition | Middle East | News". The Independent . Retrieved 24 May 2016.
  10. Rowena Mason and Ewen MacAskill (19 December 2016). "Saudi Arabia admits it did use UK-made cluster bombs in Yemen". The Guardian . Retrieved 19 December 2016.
  11. "Fire Power Display 2007 at Pokhran". Archived from the original on 11 April 2009. Retrieved 7 April 2009.
  12. "Photographic image : Bombing". The Times of India. Retrieved 24 May 2016.
  13. Schriftelijke vragen en antwoorden/Questions et réponses écrites (PDF). Brussels. 18 February 2008. p. 447. Retrieved 9 July 2023.{{cite book}}: CS1 maint: location missing publisher (link)
  14. Tweede Kamer, vergaderjaar 2006–2007, 21 501-02, nr. 760 (PDF). 's-Gravenhage: Sdu Uitgevers. 27 June 2006. pp. 6–7, 12–14. Retrieved 9 July 2023.

Bibliography