BAC/Dassault AFVG

BAC/Dassault AFVG

Company type	Collaborative aerospace project
Industry	Aerospace, defense
Predecessor	BAC TSR-2 (cancelled)
Founded	1960s
Fate	Project terminated in June 1967; redesign led to UKVG and MRCA programs
Successor	United Kingdom Variable Geometry (UKVG), Multi-Role Combat Aircraft (MRCA)
Area served	United Kingdom, France
Key people	Sir Barnes Wallis (concept pioneer), Marcel Dassault (Dassault Aviation founder)
Products	Variable-geometry wing supersonic multirole combat aircraft (project)

BAC/Dassault AFVG (Anglo-French Variable Geometry) was a collaborative initiative during the 1960s to develop a supersonic multi-role combat aircraft featuring variable-sweep wing technology, jointly undertaken by British Aircraft Corporation (BAC) and Dassault Aviation.

The initiative sought to capitalize on variable-geometry wing advancements while promoting aerospace collaboration between the UK and France. Nevertheless, the project lacked strong endorsement from both Dassault and the French Air Force. Additionally, indecision within the British side and evolving requirements further hindered progress. By mid-1967, British priorities had narrowed to adapting the AFVG as a strike platform for the Royal Air Force (RAF), intended to succeed the cancelled BAC TSR-2 bomber.

Following France's withdrawal, the program was terminated in June 1967. Subsequently, BAC reoriented the design into the UKVG, focusing exclusively on RAF specifications and seeking alternative partners. This development path ultimately led to the multinational "Multi Role Combat Aircraft" (MRCA) program, backed by Anglo-German-Italian collaboration, which produced the Panavia Tornado, a variable-geometry wing fighter/strike aircraft.

Background

Since 1945, British efforts had been directed towards exploring variable geometry wings. Engineer Sir Barnes Wallis was a pioneer of this concept during World War II, envisioning an aircraft that dispensed with a vertical stabiliser and rudder by employing variable geometry wings for flight control. In 1946, Wallis published seminal work advocating such aerodynamic configurations. Both the Ministry of Supply and Ministry of Defence supported experimental trials involving projectiles utilizing this technology, while Wallis persisted in promoting manned aircraft designs with variable geometry.

In 1951, Specification ER.110T called for a piloted research aircraft featuring variable geometry wings; however, this project was ultimately cancelled as attention shifted toward conventional transonic fighter development. Wallis also proposed "Swallow," a large reconnaissance/bomber aircraft with a variable delta wing under Specification OR.330, but funding ceased in June 1957. Research efforts resumed in 1958 within NATO's Mutual Weapons Development Programme, facilitating information exchange with the United States.

During the mid-1950s, multiple British aerospace firms pursued designs incorporating variable geometry. These included a supersonic variant of the Folland Gnat and Vickers' concept for a substantial strike aircraft responding to Specification GOR.339 aimed at producing a nuclear-capable supersonic bomber. In 1964, BAC integrated Vickers' prior work into the BAC P.45—a lightweight strike and two-seat trainer platform equipped with variable geometry wings. BAC actively promoted government procurement of the P.45 among various contenders for Specification AST.362 covering advanced fighter/trainer roles. Despite being widely regarded as an optimal choice, Defence Secretary Denis Healey preferred pursuing a joint UK-France venture based on Breguet's Br.121 ECAT design instead.

Anglo-French cooperation

Starting in 1964, the French and British governments engaged in extensive discussions regarding collaborative military aviation ventures. Negotiations were led by Handel Davies and Ingénieur-General Lecamus, focusing on developing two combat aircraft: the French would take charge of a lightweight ground-attack and training aircraft, while the British would spearhead a multirole fighter featuring variable-geometry wings designed for strike, reconnaissance, and interception missions.

Following the cancellation of the BAC TSR-2, on 17 May 1965 both governments formalized agreements for two projects. One evolved into the SEPECAT Jaguar, derived from the Breguet Br.121 ECAT concept, while the other was the AFVG—a larger fighter intended for carrier operations with the French Navy and fulfilling interceptor, strike, and reconnaissance roles for the RAF. The AFVG was planned as a joint development between BAC and Dassault Aviation, powered by a SNECMA/Bristol Siddeley M45G turbofan engine developed through a Franco-British partnership.

Design requirements

The AFVG feasibility specification released on 13 July 1965 bore close resemblance to that of the discontinued TSR-2. It specified a maximum velocity of 800 knots at sea level and Mach 2.5 at higher altitudes, with a combat radius of 500 nautical miles and a ferry range extending to 3,500 nautical miles. The aircraft was to be equipped with a nose-mounted interception radar capable of detecting targets up to 60 nautical miles away and armed with two 30 mm cannons alongside a tactical nuclear bomb weighing 2,500 pounds. Definitive specifications were postponed until April 1966.

This multirole specification aligned with contemporaneous designs such as the Hawker Siddeley P.1154 and General Dynamics F-111K. Initially conceived to replace the English Electric Lightning as an interceptor, by 1966 AFVG’s mission shifted toward complementing the F-111K strike aircraft following the UK's procurement of the McDonnell Douglas F-4 Phantom II. The AFVG was intended to supplant both the English Electric Canberra and the V bomber fleet.

Propulsion was to be provided by two SNECMA/Bristol Siddeley M45G turbofans, supplied via Mirage-style half-shock cone air intakes. France awarded the engine development contract to a joint venture between SNECMA and Bristol Siddeley incorporated in France.

Project termination

Marcel Dassault, founder of Dassault Aviation, perceived ceding leadership of AFVG to BAC as undermining his company’s ambition to become a leading prime contractor in combat aircraft production. Within a year, Dassault actively worked against AFVG by initiating two rival internal projects: the variable-geometry Mirage G and Mirage F1. Both Dassault and the French Air Force were initially skeptical about AFVG—the Air Force favored an indigenous variable-geometry interceptor design, while Dassault considered the project inconsistent with its strategic direction. The UK sought an effective strike platform whereas France prioritized interceptors, resulting in conflicting design priorities.

The project complexity increased due to Britain’s attempt to satisfy both RAF and Royal Navy requirements with one airframe. Consequently, two variants of AFVG were planned: one multirole fighter equipped with pulse-Doppler radar and air-to-air missiles, and another strike-oriented version with limited interceptor capabilities.

In June 1967, France withdrew from AFVG citing financial concerns officially. However, Flight International suggested Dassault used cost issues as a pretext to redirect resources and intellectual property toward its own variable-geometry programs. The termination of AFVG was a significant blow for Britain, which had depended on Anglo-French collaboration alongside American designs to meet its combat aircraft demands.

France’s unilateral exit sparked criticism within the British House of Commons. By that stage, the British Air Ministry faced cancelling the F-111K program—a decision finalized in March 1968—after investing £2.5 million in AFVG without tangible outcomes. To rationalize lacking a replacement strike aircraft following repeated project failures, Defence Secretary Healey abolished the requirement altogether. In 1968, Prime Minister Harold Wilson and Healey declared plans for British troop withdrawals by 1971 from major strategic bases located 'East of Suez' across Southeast Asia, the Persian Gulf, and the Maldives.

Redesign

Confronted with the possibility of lacking operational aircraft to fulfill the RAF's strike mission, BAC redesigned the AFVG concept by eliminating carrier-based features and concentrating on a larger, strike-capable variable geometry platform. The project, renamed the United Kingdom Variable Geometry (UKVG) aircraft, received preliminary contracts from BAC. In November 1967, BAC published a brochure presenting UKVG proposals that included multiple engine options and explored the rapid development of a demonstrator powered by a pair of Rolls-Royce/MAN Turbo RB153 turbofan engines.

Due to constrained UK financial resources, the British government turned to NATO allies—such as Belgium, Canada, Italy, the Netherlands, and West Germany—to collaborate on a shared strike aircraft development. This cooperation culminated in a memorandum of understanding in July 1968 among these countries, initiating the multinational Multi-Role Combat Aircraft (MRCA) program. The MRCA project ultimately resulted in the Panavia Tornado, a variable geometry aircraft engineered for strike, reconnaissance, and interception roles.

Bibliography

• Bowman, Martin W. SEPECAT Jaguar. Barnsley, South Yorkshire, UK: Pen and Sword Books, 2007. .
• Gardner, Charles. British Aircraft Corporation: A History. London: B.T. Batsford Limited, 1981. .
• Gardner, Robert. From Bouncing Bombs to Concorde: The Authorised Biography of Aviation Pioneer Sir George Edwards OM. Stroud, Gloucestershire, UK: Sutton Publishing, 2006. .
• Heron, Group Captain Jock. "Eroding the Requirement." The Birth of Tornado. London: Royal Air Force Historical Society, 2002. .
• Morris, Peter W. G. The Management of Projects. Reston, VA: American Society of Civil Engineers, 1994. .
• Wallace, William. "British External Relations and the European Community: The Changing Context of Foreign Policy-making." JCMS: Journal of Common Market Studies, Volume 12, Issue 1, September 1973, pp. 28–52.
• Willox, Gerrie. "Tornado/MRCA: Establishing Collaborative Partnerships." The Birth of Tornado. London: Royal Air Force Historical Society, 2002. .
• Wood, Derek. Project Cancelled. Macdonald and Jane's Publishers, 1975. .
• Wood, Derek. Project Cancelled: The Disaster of Britain's Abandoned Aircraft Projects. London: Jane's, 2nd edition, 1986. .

External links

• "Anglo-French projects go ahead... The AFVG and its dual role." Flight, 26 January 1967
• "Anglo-French projects go ahead... Includes an artist's concept drawing of RAF and French Navy variants by Flight illustrator Frank Munger," Flight, 26 January 1967