We don't have much about the Stataltex. That thing hold the airbreathing speed and height records from 1964 until the 1990's, when scramjets were made to work at last (Kholod, X-43, X-51). Stataltex flew at Mach 5 and 39 km (128 000 feet). For the record, in 1958 the X-7A-3 with a RJ59 ramjet hit Mach 4.31 and 106 000 feet.
There were ten Stataltex flights from 1960 to 1964. I've found a (crude) graph of velocities and altitude from the successfull flights (flight 3 and 4 are not present, you bet they were failures: no data; same for flight 10 ?)
From this (huge) paper, mercifully available at the Internet Archive (page 55 of the Pdf)
Flight 1 Mach 4+ at 12 km (partial failure ?)
Flight 2 Mach 4.7 at 18 km
Flight 3 --
Flight 4 --
Flight 5 Mach 4.6 up to 39 km
Flight 6 Mach 5 up to 30 km
Flight 7 Mach 4.5 at 12 km (probably a partial failure)
Flight 8 Mach 4,8 at 18 km
Flight 9 Mach 5, 12 km
Flight 10 ? no data
Can't fit the full name of ONERA (Office National d'Études et de Recherches Aérospatiales), or it's original name, Office National d’Études et de Recherches Aéronautiques, into a tag, drats.
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