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  This plane will be able to fly anywhere in the world within 4 hours The engine will be able to fly in outer space too. British aerospace firm Reaction Engines Limited is working on an engine system that will be able to take 300 passengers anywhere in the world in just four hours. Even more impressively, the engine will also be used to fly a plane in outer space, as Business Insider reports. The engine system is called SABRE, and it relies on a device called the precooler - technology that cools down the air entering the engineer system by more than 1,000 degrees Celsius in .01 seconds. That corresponds to an unheard-of cooling rate of 400 megawatts, and will allow the plane to “breathe” oxygen.   British aerospace firm Reaction Engines Limited is working on an engine system that will be able to take 300 passengers anywhere in the world in just four hours. Even more impressively, the engine will also be used to fly a plane in outer space, as Business Insider

  what hypersonic flow is..?   Hypersonic Technology Vehicle 2   experimental rocket glider developed as part of the DARPA project capable of flying at 13,000 mph (21,000 km/h).It is testing technologies to provide the US with the capability to strike any target in the world within one hour  Its targets are NASA's  X 43 its CFD analysis shows as mach 7