SR-72 could be operational by 2030
One of the highest performing jet aircraft ever produced was the Lockheed Martin SR-71 Blackbird. That aircraft has been retired for years but was so far ahead of its time that some of the components used in high-speed jet are still classified. The SR-71 once traveled from New York to London in less than two hours reaching speeds of over mach 3 and setting records that have held up for almost 40 years.
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Lockheed Martin has unveiled the next generation aircraft called the SR-72. Lockheed says that its engineers developing the aircraft and its intended to go twice as fast as the SR-71. The aircraft would be unmanned and fly at up to Mach 6. Lockheed Martin says that at that speed the aircraft would be so fast adversaries wouldn't have time hide.
Lockheed Martin believes that the SR-72 hypersonic demonstrator aircraft can be operational by 2030. The aircraft would use a traditional turbine engine to power takeoff up to Mach 3 and then a dual-mode ramjet accelerate the vehicle to hypersonic speeds.