Dassault Mirage G
| Company type | Military aircraft project |
|---|---|
| Industry | Aerospace |
| Founded | 1967 |
| Founder | Dassault Aviation |
| Headquarters | France |
| Products | Variable-sweep wing supersonic fighter prototypes |
The Dassault Mirage G, sometimes referred to as the Mirage IIIG, represented a version of the French Dassault Mirage supersonic fighter jets equipped with variable-sweep wing technology. A total of three prototypes were constructed and flown: one single-engine G model and two twin-engine G8 variants, which initially began as the G4. Although several roles and configurations were explored, none reached mass production.
Origins
In 1963, France's defence ministry initiated research into variable-sweep wing aircraft capable of operating from both terrestrial bases and aircraft carrier decks, in response to the American TFX program that eventually produced the General Dynamics F-111.
While ONERA conducted parallel investigations, Dassault launched its own studies on a variable-geometry version of the Mirage. Initial designs included the Mirage F4G and, by 1964, the MD800—a naval fighter with two seats and twin engines designed to meet the DAFNE specification—as well as a more compact single-engine Mirage IIIF2G.
In 1965, Dassault joined forces with the British Aircraft Corporation (BAC) to develop an Anglo-French Variable Geometry (AFVG) aircraft: a larger two-seat, twin-engine model. However, this partnership dissolved in 1967 after Dassault withdrew amid political tensions.
Concurrently, the IIIF2G concept evolved into a contract for a single-seat, single-engine Mirage G prototype. Its unveiling in 1967 coincided with the cancellation of the AFVG project, leading to British allegations that Dassault had undermined their cooperative venture.
Mirage G
The two-seat, single-engine Mirage G was introduced in 1967 as a swing-wing adaptation of the Dassault Mirage F2. Its wings could sweep between 22 degrees forward and 70 degrees backward, incorporating full-span double-slotted trailing edge flaps along with dual-position leading edge flaps.
The aircraft’s maiden flight took place on 18 November 1967. Although it was generally well received during evaluations, it was lost in a crash on 13 January 1971 caused by complete electrical failure.
Mirage G8
Initially designated as the Mirage G4, this twin-engine, two-seat nuclear strike fighter project received a contract in 1968 for two prototypes—G4-01 and G4-02—planned to be powered by Snecma M53 turbofan engines. As development progressed, its mission shifted toward interception duties, prompting a redesignation to Mirage G8.
The first flight of Mirage G8-01 occurred on 8 May 1971. The second prototype, G8-02, was completed as a single-seat variant where avionics replaced the rear cockpit; it also featured an extended nose accommodating a Cyrano radar mockup. This aircraft flew for the first time on 13 July 1972.
Equipped with Thomson-CSF radar systems and a low-altitude navigational-attack suite derived from the SEPECAT Jaguar and Dassault Milan, the G8 underwent successful test flights. Nevertheless, no production contract materialized due to budget restrictions within the French defence allocations from 1971 to 1976. The Mirage G program officially ended in 1968, although flight testing persisted until the lone Mirage G prototype was lost in an accident on 13 January 1971.
Influence on the LTV V-507
During the late 1960s, the American company Ling-Temco-Vought (LTV) pursued knowledge in variable-geometry wing technology as part of its proposal for the US Navy's VFX program. Leveraging the attention garnered by the Mirage G, Dassault entered into two collaboration agreements with LTV in 1968, one specifically targeting variable-sweep wing development. A team of eight Dassault engineers contributed to LTV’s design process, leading to the creation of the Vought V-505 and V-507 concepts, along with a full-scale mockup of the V-507. Ultimately, the contract was awarded to Grumman’s F-14 Tomcat.
An outcome of this partnership was a study for a twin-engine, two-seat Mirage G5—a larger naval adaptation of the G4/G8 series—powered by dual SNECMA-manufactured Pratt & Whitney TF306 turbofan engines, featuring a length of and a wingspan of .
Variants
- Note: Unless noted otherwise, information is sourced from Carbonel 2023.
- F4G
- Preliminary design phase preceding the initial prototype. Conducted between 1963 and 1964.
- MD800
- Submission for the DAFNE project in 1964.
- G
- Single-engine prototype that first flew in 1967.
- G0
- Proposed advanced trainer and attack model offered to Australia in both single- and twin-engine configurations; progressed to mock-up stage.
- G1 and G1M
- Production-ready G variant proposed to French and Australian air forces in 1968; G1M was a navalized version suggested in 1970.
- G2 and G6
- Concepts developed alongside the G1 as potential NATO replacements for the Lockheed F-104G Starfighter.
- G3 and G3M
- Extended-range G3 equipped with enhanced radar systems; the navalized G3M was considered too large for carrier operations.
- G4 and G8
- Twin-engine fighter initiative. Two nuclear strike-oriented G4 prototypes were started but reclassified as G8 interceptors during development. Both two-seat and single-seat versions flew beginning in 1968.
- G5
- Navalized, enlarged derivative based on LTV’s V-507 requirements.
- G8A or Super Mirage
- Fixed-wing design featuring a 55° wing sweep developed from the G8. The prototype contract awarded in 1973 was canceled by 1975.
Aircraft on display
- Mirage G8-01 exhibited at the Musée de l’air et de l’espace, near Paris–Le Bourget Airport.
- Mirage G8-02 showcased at the Musée Européen de l'Aviation de Chasse in Montélimar.
Bibliography
- Buttler, Tony. X-Planes of Europe II: Military Prototype Aircraft from the Golden Age 1946–1974. Manchester, UK: Hikoki Publications, 2015.
- Buttler, Tony and Jean-Louis Delezenne. X-Planes of Europe: Secret Research Aircraft from the Golden Age 1946-1974. Manchester, UK: Hikoki Publications, 2012.
- Carbonel, Jean-Christophe. French Secret Projects 1: Post War Fighters. Manchester, UK: Crecy Publishing, 2016
- Carbonel, Jean-Christophe. "Negative G", Aeroplane, September 2023. pp. 100–107.
- Green, William. The Observer's Book of Aircraft. London. Frederick Warne & Co. Ltd., 1968.
- Green, William. The Observer's Book of Aircraft. London. Frederick Warne & Co. Ltd., 1972.