Popular Mechanics: The development of a jet which could fly anywhere in the world within four hours. An excerpt:
Reaction calls the aircraft the Skylon, and it imagines the plane carrying 300 passengers at mach 5. It's powered by SABRE, which sounds like a villainous spy organization but actually stands for Synergetic Air-Breathing Rocket Engine. Those engines could be cooled to -160 degrees Celsius using compressed helium. The $1.1 billion plane would be 276 feet long—40 feet longer than a Boeing 747.
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