“The engine would incorporate turbine stages not connected by a shaft, each able to rotate independently at the optimal speed for maximum aerodynamic efficiency in flight. They would spin in electromagnetic fields, using the same principle that allows high-speed trains to float frictionless above an energized track. The engine is a hybrid of turbofan, turbojet, and turbo ramjet, able to generate 40 megawatts (MW) of electricity. It uses about 9 MW of electricity to power a plasma field generator reshaping airflow around the aircraft and taming the pressure wave, turning sonic boom into a sound similar to rustling leaves on the ground.”

http://www.aopa.org/News-and-Video/All-News/2013/July/1/Pilot-Briefing-New-York-to-Tokyo-in-two-hours.aspx

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