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Japan Runs Turbojet At Simulated Mach 4
Japanese engineers have ground tested a turbojet in conditions equivalent to Mach 4, which they believe is the highest simulated speed at which a turbine engine has operated.
The February round of tests was a step toward building an engine that, unlike ramjets, has the thrust and efficiency advantages of mechanical compression and the ability to propel an aircraft from takeoff to Mach 5.