The Mirage G, G4, and G8 were Dassault variable-sweep-wing prototypes developed as France studied swing-wing aircraft for air force and naval aviation requirements. They explored whether a Mirage-style aircraft could combine high-speed performance with improved low-speed handling and mission flexibility.
Variable sweep promised a wide operating envelope: wings forward for takeoff, landing, and lower-speed handling; wings swept for dash and high-speed penetration. The Mirage G series tested these aerodynamic and structural ideas across single- and twin-engine configurations, including concepts relevant to nuclear strike and interception roles.
The program did not produce a frontline aircraft, but it generated useful flight-test data and showed the cost and complexity of variable-sweep designs. France ultimately favored other aircraft paths, yet the Mirage G family remains important for understanding Dassault's exploration of post-Mirage III strike and interceptor concepts.
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