Three prototypes and six pre-production of the  SO 9050 Trident II were built, but only three of the latter were completed. The prototypes were powered by a pair of Dassault MD.30 Viper turbojets and two-chamber SEPR 631 rocket engines. The first prototype attained a speed of Mach 1.96 without the missile at a height of 19,100 m (62,664 ft). The aircraft exploded in mid-air during a practice flight for the Paris Air Show 1957, killing the pilot………..Wiki

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