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Flight Planning and Conduct of the X-15A-2 Envelope Expansion Program
Final rept. 25 Jun 1964-3 Oct 1967
AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
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After having been extensively damaged during an emergency landing on its thirty-first flight November 9, 1962, the X-15-2 aircraft was rebuilt and modifications were incorporated to increase the vehicle performance capability to allow flight testing of a hypersonic ramjet engine. The increased performance was derived from additional propellants contained in two external drop tanks. The modified propellant system with the external tanks was satisfactorily developed on a ground test stand and performed adequately during flight. The ablative material developed to protect the aircraft against temperatures exceeding the original aircraft design appeared to perform satisfactorily on the two fully coated flights flown. On the last flight of this aircraft, the vehicle achieved a maximum Mach number of 6.7.
APPROVED FOR PUBLIC RELEASE