In 1952, the French government issued its specification, calling for a lightweight, all-weather interceptor, capable of climbing to in 6 minutes along with the ability to reach Mach 1.3 in level flight. Three separate French manufacturers decided to respond to the specification, these being Dassault Aviation, Sud-Est, and Sud-Ouest, offering the MD.550 Mystère Delta, SE.212 Durandal and SO.9000 Trident, respectively. Dassault's submission, which became known as the MD.550 Mystère Delta, was a diminutive and sleek-appearing aircraft that was principally powered by a pair of Armstrong Siddeley MD30R Viper afterburning turbojet engines (built under licence by Dassault); atypically, the design also featured provisions for the installation of a secondary propulsion system in the form of a SEPR-built 66 liquid-fuel rocket engine, capable of providing boost thrust of .
In 1952, the French government issued its specification, calling for a lightweight, all-weather interceptor, capable of climbing to in 6 minutes along with the ability to reach Mach 1.3 in level flight. Three separate French manufacturers decided to respond to the specification, these being Dassault Aviation, Sud-Est and Sud-Ouest, offering the MD.550 Mystère Delta, SE.212 Durandal and SO.9000 Trident, respectively. Dassault's submission, which became known as the MD.550 Mystère Delta, was a diminutive and sleek-appearing aircraft that was principally powered by a pair of Armstrong Siddeley MD30R Viper afterburning turbojet engines (built under licence by Dassault); atypically, the design also featured provisions for the installation of a secondary propulsion system in the form of a SEPR-built 66 liquid-fuel rocket engine, capable of providing boost thrust of .