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As you probably know, Reusable Combined Cycle Flight Demonstration (RCCFD) Project, known as the X-43B, 'would demonstrate an engine capable of operating in several modes. The X-43B’s combined cycle engine would function as a normal turbojet at low altitudes and switch to scramjet mode at high altitudes and speeds. Planned X-43B flights were to occur sometime in 2009 after the completion of another Hyper-X test vehicle, the X-43C.'
X-43B was cancelled. Boeing's contender (canard) was a preffered concept. Bot how other did look like?
Source
NASA HYPERSONIC FLIGHT DEMONSTRATORS — OVERVIEW, STATUS, AND FUTURE PLANS
by Paul L. Moses, Vincent L. Rausch, Luat T. Nguyen, and Jeryl R. Hill
NASA Langley Research Center, Hampton, VA, USA
54th International Astronautical Congress of the International Astronautical Federation,
the International Academy of Astronautics, and the International Institute of Space Law
29 September - 3 October 2003, Bremen, Germany
X-43B was cancelled. Boeing's contender (canard) was a preffered concept. Bot how other did look like?
Source
NASA HYPERSONIC FLIGHT DEMONSTRATORS — OVERVIEW, STATUS, AND FUTURE PLANS
by Paul L. Moses, Vincent L. Rausch, Luat T. Nguyen, and Jeryl R. Hill
NASA Langley Research Center, Hampton, VA, USA
54th International Astronautical Congress of the International Astronautical Federation,
the International Academy of Astronautics, and the International Institute of Space Law
29 September - 3 October 2003, Bremen, Germany