Red Beard (nuclear weapon)

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A Red Beard weapon on its bomb trolley, fitted with a bomb carrier prior to loading into an English Electric Canberra bomber. The two fore and aft vertical plates shown with holes in them were baffles unique to the Canberra installation, designed to reduce airstream buffeting that could tear off the bomb doors. The baffles were made from 1 in (25 mm) thick marine plywood, drilled with numerous 1 in (25 mm) diameter holes. The tail fins of the bomb are retracted. Red Beard Bomb On Trolley.jpg
A Red Beard weapon on its bomb trolley, fitted with a bomb carrier prior to loading into an English Electric Canberra bomber. The two fore and aft vertical plates shown with holes in them were baffles unique to the Canberra installation, designed to reduce airstream buffeting that could tear off the bomb doors. The baffles were made from 1 in (25 mm) thick marine plywood, drilled with numerous 1 in (25 mm) diameter holes. The tail fins of the bomb are retracted.

Red Beard was the first British tactical nuclear weapon. [1] It was carried by Royal Air Force (RAF) English Electric Canberra medium bombers [2] and the V bomber force [3] and by Supermarine Scimitars, de Havilland Sea Vixens, and Blackburn Buccaneers of the Royal Navy's (RN) Fleet Air Arm (FAA). Developed to Operational Requirement OR.1127, [3] [4] it was introduced in 1961, [3] entered service in 1962. [3] It was replaced by the WE.177 in the early 1970s and was withdrawn from service in 1971. [3]

Contents

Design

Explosion of a Red Beard warhead (codenamed Buffalo R1/One Tree, fired on 27 September 1956) during the British nuclear tests at Maralinga Buffalo R1 003.jpg
Explosion of a Red Beard warhead (codenamed Buffalo R1/One Tree, fired on 27 September 1956) during the British nuclear tests at Maralinga
A Red Beard training variant on display at Explosion Museum of Naval Firepower Red Beard training nuclear bomb at Explosion Museum (2).jpg
A Red Beard training variant on display at Explosion Museum of Naval Firepower

Red Beard was an unboosted fission weapon that used a composite core (mixed core in British terminology of the time). The composite core used both weapons-grade plutonium and weapons-grade uranium-235, and was intended to minimise the risk of pre-detonation that was a feature of all-plutonium designs of that period with yields larger than 10  kilotons (kt). An added benefit of the composite core was a more economical use of fissile material. The design was tested twice during the Operation Buffalo series of nuclear trials at Maralinga in Australia – first (codenamed Buffalo R1/One Tree) on 27 September 1956: a 15 kt explosion, after which the resulting mushroom cloud rose to a height of 11,430 m (37,500 ft), and again (codenamed Buffalo R4/Breakaway) on 21 October 1956. Although the design concept of Red Beard was similar to that of the Blue Danube warhead, [3] an innovative means of implosion meant that its overall size could be significantly reduced.[ citation needed ]

Its measurements were 3.66 m (12 ft 0 in) in length, 71 cm (2 ft 4 in) in diameter, and a weight of approximately 1,750 pounds (794  kg ). Two versions were produced: the Mk.1, with a yield of 15  kilotons, and the Mk.2, with a yield of 25 kilotons. The Mk.2 was available in two variants, the No.1 used by high-altitude bombers, and the No.2 variant that was intended for low-level delivery by the toss bombing method, and its 'over-the-shoulder' variant referred to as the Low Altitude Bombing System (LABS).

Red Beard's Royal Air Force and Royal Navy service designations were:

Weighing in at approximately 794 kilograms (1,750  lb ), Red Beard was considerably lighter than the 2,000 lb (910 kg) official service designation, [3] which was based on the original technical requirement.

Another significant improvement over Blue Danube was the electrical system for the bomb firing mechanism and the radar altimeter fuse. Blue Danube had used 6 volt lead–acid batteries that were unreliable, and had to be installed at the last minute before takeoff. There were also potential risks associated with 'stray' electrical discharges to the firing mechanisms which might have led to accidental detonation. Red Beard used twin ram-air turbines located in the nose, from which there could be no stray discharges before bomb release. The air inlet can be seen in the extreme nose. They exhausted through 'blow-out' patches in the nose sides. Until bomb release, the weapon drew electrical power from the aircraft for heating and pre-heating of the radar fuzes.

A Red Beard casing at RAF Cosford museum in 2007, shown without the 'drop' harness, and on the regular dolly Red Beard.jpg
A Red Beard casing at RAF Cosford museum in 2007, shown without the 'drop' harness, and on the regular dolly

Like Blue Danube, the body diameter at 71 cm (2 ft 4 in) was greater than was desirable relative to the overall length of 3.66 m (12 ft 0 in). To compensate for this stubbiness, and quickly stabilise the bomb after release, Red Beard was equipped with flip-out tail fins that were activated pneumatically, triggered by a lanyard attached to the aircraft.

As with Blue Danube, the fuzing arrangements were composed of twin radar fuzes that were activated by a barometric 'gate' after release. The barometric gate ensured that the radar fuzes only transmitted in the last few seconds of free-fall, to a computed burst height, and this technique minimised the possibility of radar countermeasures disabling the radar fuzes. There were back-up contact and graze fuzes to ensure bomb destruction in the event of a misfire.

None of the variants allowed in-flight arming of the fissile core. The core was inserted before take-off, in a process referred to as 'last minute loading'. For carrier-borne aircraft, landing with the armed weapon was forbidden, and the aircraft would instead be diverted to a shore airbase. Although the Royal Navy required its Sea Vixen aircraft to be type-approved for Red Beard carriage as insurance against delays in the development of the Blackburn Buccaneer, the Sea Vixen never deployed in the nuclear strike role. Early models were subject to severe environmental limitations, especially when loaded into Royal Navy Scimitars on exposed aircraft carrier decks in Northern waters. The Mk.2 variants were better engineered to withstand extreme conditions, and other than the yield difference, this was the main area of difference.

When the bomb was delivered by low-level toss bombing, the aircraft was almost always at a lower altitude than the burst height; so in effect, the bomb was not really 'dropped', but was released and 'flew' upwards in a ballistic trajectory, to detonate when it reached the required altitude.

Service in United Kingdom and Singapore

Royal Air Force stocks of Red Beard for the Canberra [5] and V-bomber [3] forces totalled 110. Of these, forty-eight were deployed in Cyprus [5] to meet the UK's commitments to Central Treaty Organization (CENTO), forty-eight were deployed in Singapore at RAF Tengah [2] [5] to meet commitments to Southeast Asia Treaty Organization (SEATO), and the remainder were located in the United Kingdom. Royal Navy stocks are believed, from archived declassified documents, to total thirty-five weapons, to be shared between five aircraft carriers, and shore-based supply and overhaul infrastructure. The carriers were thought (from similar sources) to each have an air-conditioned storage capacity for five Red Beard weapons.

Before the Red Beard codename was issued in 1952, it was frequently referred to in official documents as the 'Javelin Bomb', because it was originally conceived as a weapon for the 'thin-wing Javelin bomber', a projected derivative of the (thick wing) Gloster Javelin all-weather fighter. The designation 'target marker bomb' was a euphemism used to disguise the nature of the bomb, so that its dimensions and weights etc. could be circulated to aircraft and aircraft equipment designers, without compromising security.

It was replaced by the WE.177 in the early 1970s. [3]

John Dolphin

Whilst Chief Engineer at the Atomic Weapons Research Establishment (AWRE), Aldermaston, John Dolphin worked on the Red Beard trigger mechanism. Subsequently, in July 1959, Dolphin requested an ex-gratia financial award for his work on the weapon; but was turned down. His claim was that although it was not his job to do so, he invented the 'Rotary Hot Line' device that eventually became the trigger for the Red Beard bomb (and which was used in all subsequent thermonuclear bombs). He further stated that his invention brought to an end the deadlock in meeting the specification for the Red Beard, and that he had to overcome "serious opposition" against the senior scientists whose job did include the brief for its invention. His claim was refused on the grounds that as a 'Chief Engineer', it was within the scope of his duties. [6]

Surviving examples

At the Air Force Museum in Cosford, England, one is displayed on a trolley in front of a bomber. A training version is on display at the Explosion Museum of Naval Firepower.

See also

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References

  1. ↑ "Tactical atomic bomb (RED BEARD): operational requirement". National Archives. 1957. Retrieved 27 March 2024.
  2. 1 2 "Vulcans in Camera: Vulcan B2 XM611 at Darwin". AvroVulcan.org.uk. Andy Leitch. Archived from the original on 16 February 2017. Retrieved 19 May 2017.
  3. 1 2 3 4 5 6 7 8 9 "Vulcans in Camera: Red Beard". AvroVulcan.org.uk. Andy Leitch. Retrieved 19 May 2017.
  4. ↑ Public Record Office, London. AIR 2/17322-e041-P01.
  5. 1 2 3 Tom Rhodes (31 December 2000). "Britain kept secret nuclear arsenal on Cyprus". The Sunday Times . London: Times Newspapers Ltd / News International. Archived from the original on 10 June 2001. Retrieved 19 May 2017.
  6. ↑ "AB 16/3207 - Claim made by J.R.V. Dolphin, Chief Engineer in recognition of inventions related to the Red Beard bomb" (PDF). NationalArchives.gov.uk. The National Archives, Kew, London. 1959–1960. Archived from the original (PDF) on 20 November 2007. Retrieved 25 April 2009.

Bibliography

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