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By proper and continuous control of the two axes in combination with rotation of the arm, the forces from high-G flight can be imposed on the pilot. This centrifuge was an ideal tool with which to explore the powered and reentry phases of X–15 flights. Another significant apparent. Previously, aspect the of gondola the NADC had centrifuge been driven soon along became a pro- gramed G pattern, not influenced by the pilot; he was, in effect, a passenger. But in flight an X–15 pilot not only would have to with- stand high G forces but maintain precise control while being squashed down to in find marginal reentry.
Details of Hypersonic Flow Emerge From these analyses, the details of hypersonic flow began to unfold. The results data also confirmed confirmed many another of its peculiar nonlinear trend of characteristics. hypersonic flight: o reduced importance of the wings for lift. At Mach 6 and 25 The the angle of attack, the large fuselage and side fairings on the X–15 contribute AERODYNAMICS OF SUPERSONIC-HYPERSONIC FLIGHT 51 70 percent of the total lift, enough to permit reentry from an altitude of 250 000 feet with fuselage lift alone.
Lt is obvious that safety of operation was not gained mixture of at the sacrifice of over-all reliability. The engine burns a liquefied oxygen (LO2). problems, because of low temperatures the propellant These the of are temperature extremes surrounding structure propellants corrosive liquid tanks anhydrous an have which integral between pose properties oxygen, exerted of of few and –297 F. airplane the the Since structure, lox influence and handling o at to major (NH3) ammonia the close a a boils part structure ammonia tank on and thermal stresses and structural design.